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2 5 7 d e c e m b e r 1 2 , 1 9 97 ul634h256 a d v anced i nform a t i o n l o w v o l tage powerstore 32k x 8 nvsram pin co n f ig u r a tion pin descrip t ion si g nal n a m e s ig n al d e s cri p ti o n a 0 - a 1 4 addres s i n p u ts d q 0 - d q 7 d a t a i n / o u t e c h i p en a b l e g o u t p u t e n a b l e w write enable v c c x p o w er s u p p l y volt a g e vss g round v c ap c a p a cit o r h s b h a r d w a r e c o n t rolle d s t o r e /busy f eat u r e s p h ig h - p e r f o r m a n c e c m o s n o n- v o l a t i l e s t a t i c r a m 3 2 7 6 8 x 8 b i t s p 4 5 a n d 5 5 ns a c c e s s t i m e s p 2 0 a n d 25 n s o u t p u t e n a b l e a c c e s s t i m e s p i cc = 8 m a at 2 0 0 n s c y c l e t i m e p a u t o m a t ic s t ore t o e eprom o n p o wer d o wn usi n g e x t e r n a l c a p a c i t o r p s o f t w a r e i n i t i a t e d s t o r e p a u t o m a t ic s t ore t i m i ng p 10 5 s t ore c y c l e s t o eeprom p 1 0 y e a r s da t a r e t e n t i o n i n e eprom p a u t o m a t i c reca l l o n p o w e r up p s of t w a r e r e c all i n it i a t i o n p u n l i m i t e d reca l l c y c l e s f r o m e e prom p w i d e v o l t a g e r a n g e: 2 .7 ... 3.6 v p o p e r a t i n g t e m p e r a t u r e r a ng e s : 0 t o 70 c - 4 0 t o 85 c p c ecc 9 0 0 0 0 q u a l i t y s t a n d a rd p e sd ch a r a c t e ri z a t i o n a c c o r d i n g m i l s t d 8 8 3 c m 3 0 1 5 .7-h b m p p a c k a g e s : s o p 3 2 ( 3 0 0 mi l ) tsop 3 2 ( t y p e i) descri p tion t h e ul 6 3 4 h2 5 6 h a s t w o s e p a r a t e m o d es of o p e r a t i o n : sram m o d e a n d n o n v o l at i l e m o d e. i n s ram m o d e, t h e m e m o r y o p e r a t es as an or d i n a r y st a t i c ra m . in n o n v o l a t i l e o p e r at i o n , d a t a i s t r a n s f e rr e d in p a r a l l e l f r o m sram t o ee p rom or f r o m eeprom t o sr a m . i n t h is m o d e sr a m fu n c t i o ns a r e d i s a b - l e d . t h e u l 6 3 4 h2 5 6 i s a f a st s t a t i c ram (45 a n d 5 5 ns), w i t h a n o n v o- l a t i l e e l e ct r i c a l l y e r a s a b l e prom (ee p rom) e l e m e n t i n c o r p o r a t ed i n e a c h s t a t i c m e m o r y c e l l . th e sram c a n b e r e a d a n d wri t t e n an u n l i m i t e d n u m b er of ti m e s, w h i l e i n d e p e n d e n t n o n v o l a t i l e d a t a r e s i - d e s in ee p rom. d a t a t r a n s f e r s f r o m t h e sram t o t h e e eprom ( t h e s t ore o p e r a - t i o n ) t a ke p l a c e a u t o m a t i c a l l y up o n p o w e r do w n u s i n g c h a r g e s t o r ed i n an e x t e r n a l 1 0 0 m f c a p a ci t o r . t r a n s f e r s f r o m t h e eeprom t o t h e sram ( t h e rec a l l o p e r a t i o n ) t a k e p l a c e a u t o m a t i c a l l y o n p o w er u p . the u l 6 3 4 h2 5 6 c o m b i n e s t h e h i g h p e r f o r m a n c e a n d e a s e o f u s e o f a f a s t s r a m w i t h n o n v o l a t i l e d a t a i n t e gr i t y . s t ore c y c l e s a l s o m a y b e i n i t i a t e d u n d er us e r c o n tr o l v i a a s o f t w a r e s e q u e n c e o r v i a a s i n g l e p i n ( h sb ). once a s t o r e c y c l e i s i n it i a t e d, f u r t h e r i n p u t o r o u t pu t a r e d i s a b l e d u nt i l t h e c y cle i s c o m p l e t e d. b e c au s e a s eq u e n c e o f a d d r es s es is u s e d f o r s t ore i n i t i a t i o n , i t is i m p o r t a n t t h a t n o o t h e r r e a d o r w r i t e a c c e s s e s i nt e r v e n e i n the s e q u e nce o r t h e s e q u e n ce w i l l b e a b o r t e d . rec a l l c y c l e s m a y a l s o b e i n i t i a - t e d b y a s o f t w a r e s e q u e nc e . i n t e r n a l l y , rec a l l is a t w o s t e p p r o c e d u r e. f irst, t h e sram d a t a is cl e a r e d a n d s e c o n d , t h e n o n v o l at i l e i n f o r m at i on i s tr a n s f e rr e d i n t o t h e s r a m c e l l s. t h e reca l l o p e r a t i o n i n n o w a y a l t e rs t h e d a t a i n t h e e eprom c e l ls. th e n o n v o l a t i l e d a t a c a n b e r e c a l l e d a n u n l i m i t ed nu m b e r o f t i m e s . t op vi e w sop vc c x h s b w a 1 3 a8 a9 a 1 1 g n . c . a 1 0 e d q 7 d q 6 d q 5 d q 4 d q 3 v c a p a14 a12 a7 a6 a5 a4 a3 n . c . a2 a1 a0 d q 0 d q 1 d q 2 vss 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 g a 1 1 a9 a8 a 1 3 w h s b vc c x v c a p a 1 4 a 1 2 a7 a6 a5 a4 a3 n . c . a10 e d q 7 d q 6 d q 5 d q 4 d q 3 vss d q 2 d q 1 d q 0 a0 a1 a2 n . c . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 ts o p t o p vi e w
2 58 d e c e m b e r 1 2 , 1 9 9 7 ul634h256 advanced information e e p r o m a r r a y 5 1 2 x ( 6 4 x 8) r e c a ll d q 0 d q 1 d q 2 d q 3 d q 4 d q 5 d q 6 d q 7 c o l u mn i /o c ol u mn d e c o d e r a0 - a 13 sto r e/ reca l l c o n tr o l h s b ro w de c o d e r v c c x v ss v c a p g e w a0 a 1 a 2 a3 a 4 a 1 0 soft w are d ete c t p ow e r c o n tr o l v ccx v c a p a5 a6 a7 a8 a9 a 1 1 a 1 2 a 1 3 a14 i nput b u f f e r s st o r e s r a m a rray 512 r o w s x 64 x 8 c o l u m n s o p e rat i ng m o de e h s b w g dq0 - d q 7 s t a n d b y / n o t s e l ect e d h h ** hi g h-z i n t e r n a l r e ad l h h h hi g h-z r e a d l h h l d a ta o u t p u t s l o w - z wr i te l h l * d at a i n p u t s h i g h - z t r u th t ab l e fo r s r a m o p e rat i ons b l o c k d i a g r a m a : s tr e s s e s gr e a t e r t h a n t h o s e list e d u n d e r ? a bs o l u t e m a x i m um r a t i n gs m a y c a u s e p e r m a n e n t d a m age t o t h e d e vi c e . t his is a s t r e ss r a ti n g o n l y , a n d f u n c t i o n a l op e r a ti o n o f t h e d e vice a t c o n diti o n a b o v e t h o s e i n d i c a t e d in t h e op e r a ti o n a l s e c t i o n s o f t h i s sp e cific a t i o n i s n o t i m p li e d. e xpo s u re t o a bs o l u t e m a xim u m r a t i n g c o ndi t i o n s f o r e x t e n d e d p e ri o d s m a y a f f e ct r e li a b ility. a b s o lute m a x i m um r a tin g s a sym b ol m i n. m a x . u n it p ow e r s u p p l y v o l t a g e v cc - 0 .5 4 .6 v i n p u t v o l t a g e v i - 0 .3 v cc + 0 . 5 v o u t p ut v o l t a ge v o - 0 .3 v cc + 0 . 5 v p ow e r d i s si p a t i o n p d 1w o p e r a t i n g t e m p e r a t u r e c - t y p e k- t y pe t a 0 - 4 0 70 85 c c s t o r a g e t e m p e r a t u r e t s t g - 6 5 1 5 0 c ch a ra c ter i st i cs all v o lt a g e s a re r e f e r e n c e d to v ss = 0 v (gro u n d ). all c h a r a c t e risti c s a re v alid i n t h e p o w e r s u pply v o lt a ge r a nge a n d in t h e o per a ti n g t e mper a t u r e r a n ge sp e ci f ied. d y n a mi c m e a s u re m e n t s a re b a s e d o n a r i s e a n d f a l l t ime o f 5 n s , m e a s u r e d b e t w e e n 1 0 % a n d 9 0 % o f v i , a s w e l l a s inp u t l e v e l s o f v il = 0 v a n d v ih = 3 v . t h e timi n g r e f e r e n c e l e v e l o f a l l i n p u t a n d o u tp u t sig n a l s is 1 . 5 v , with t h e e x c e pti o n o f t h e t dis -tim e s a n d t en - t im e s, in w h ich c a s e s tr a n siti o n i s m e a s u r e d 200 m v f r o m s t e a d y - s t a t e v o l t a g e . * h o r l
2 59 d e c e m b e r 1 2 , 1 9 97 ul634h256 a d v anced i nform a t i o n b : v cc r e f e r e n c e l e v e ls t h r o ug h o u t t h is d a t a s h e e t r e f e r to v c c x if t h a t i s w h e re t h e p o w e r s u pply c o n n e c t i o n i s m a d e , o r v c a p if v c c x i s c o n - n e c t e d t o gr o u n d . c: i c c 1 a n d i c c 3 a re d e p e d e n t o n o u t p u t l o a d i n g a n d c ycle r a t e . t h e s pe c ifi e d v a l u e s a re o bt a i n e d wi t h o u t p u ts u nl o a d e d . t h e c u r r e n t i c c 1 i s m e as u r e d f o r w r i t e / r e a d - r a t i o o f 1 / 2. i c c 2 i s t h e a v e r a g e c u r r e n t r e q u i r e d f o r t h e d u r a t i o n o f t h e s t o r e c y c l e ( s t o r e c yc l e t i m e ) . d : b ringi n g e 3 v ih wil l n o t p r o d u c e s t a n d b y c u rr e n t l e v e ls u n ti l a n y n o n v o l a tile c ycle i n p r o gr e ss h a s t im e d o u t . s e e m o d e s e l e c t i o n t a b l e . t h e c u r r e n t i c c (s b )1 is m e a s u r e d f or w r i t e /r e a d - ra t io o f 1 / 2 . dc ch a ra c teri s ti c s s y m b o l con d iti o ns c- t y pe k- t y pe u n it m i n . ma x . m i n . ma x . o p e r a ti n g s u p p l y cu r r e n t c i c c 1 v cc v il v ih t c t c = 3 . 6 v = 0 . 8 v = 2 . 2 v = 4 5 n s = 5 5 n s 3 5 3 0 3 7 3 2 ma ma a v e r a g e s u p p l y c u r r e n t d u r i n g s t o r e c i c c 2 v cc e w v il v ih = 3 . 6 v 0 . 2 v 3 v cc - 0 .2 v 0 . 2 v 3 v cc - 0 .2 v 3 4 m a a v e r a g e s u p p l y c u r r e n t d u r i n g powerstore cycle i c c 4 v cc v il v ih = 2 . 7 v = 0 . 2 v 3 v cc - 0 .2 v 2 2 m a s t a n d b y su p p l y cu r r e n t d ( c y cli n g t tl i n p ut l e v e ls) i c c(sb)1 v cc e t c t c = 3 . 6 v = v ih = 4 5 n s = 5 5 n s 9 8 10 9 ma ma o p e r a ti n g s u p p l y cu r r e n t a t t cr = 2 0 0 ns c ( c y cli n g c m os i n p u t l e v e ls) i c c 3 v cc w v il v ih = 3 . 6 v 3 v cc - 0 .2 v 0 . 2 v 3 v cc - 0 .2 v 8 8 m a s t a n d b y su p p l y cu r e n t d ( s t a b l e c m os i n p u t l e v e ls) i c c (sb) v cc e v il v ih = 3 . 6 v 3 v cc - 0 .2 v 0 . 2 v 3 v cc - 0 .2 v 1 1 m a r e c o m m e n d e d o p e ra t ing co n diti o ns s y m b o l co n dit i ons m i n. m a x. unit p o w e r s u p p l y v o l t a g e b v cc 2 . 7 3 . 6 v i n p u t l o w v o l t a ge v il - 2 v a t p u l s e w i d t h 1 0 n s p e r m it t ed - 0 .3 0 .8 v i n p u t h igh v o l t a g e v ih 2 . 2 v cc + 0 . 3 v
26 0 d e c e m b e r 1 2 , 1 9 9 7 ul634h256 advanced information sr a m m e m o r y o p er a ti o n s e : p a r a m e t e r g u a r a n t e e d b u t n o t t e s t e d . f: d e v i c e i s c o n t i n u o u s l y s e l e c t e d w i t h e a n d g b o t h l o w . g : a ddre s s v a l i d p r i o r t o o r c o i n cid e n t with e tr a n siti o n l o w . h : m e a s u r e d 200 m v f r o m s t e a d y s t a t e o u t p u t v o l t a g e . d c ch a ra c ter i st i cs symb o l c o ndi t io n s c - t y pe k - t y pe u n i t m i n . m ax. m i n . m a x . o u t p ut hi g h v o l t a ge o u t p ut l o w v ol t a g e v oh v ol v cc i oh i ol = 2 . 7 v = -2 ma = 2 m a 2 . 4 0 . 4 2 . 4 0 . 4 v v o u t p ut hi g h curr e nt o u t p u t l o w c u rr e n t i oh i ol v cc v oh v ol = 2 . 7 v = 2 . 4 v = 0 . 4 v 2 -2 2 -2 m a ma i n p u t l e a k a g e c u r r ent hi g h l o w i ih i il v cc v ih v il = 3 . 6 v = 3 . 6 v = 0 v - 1 1 -1 1 m a m a o u t p ut l e a k a g e cur r e n t high a t thr e e- s t a t e - o u t p ut l o w a t thr e e- s t a t e - o u t p ut i ohz i olz v cc v oh v ol = 3 . 6 v = 3 . 6 v = 0 v - 1 1 -1 1 m a m a n o . s w it c hi n g c har a ct e ri s ti c s re a d c y c le s y m b ol 4 5 55 u n it a lt. iec m i n . m a x. m in. m a x . 1 r e a d c y c l e t i m e f t av a v t cr 45 5 5 ns 2 a d d r e s s a c c e s s t i me t o d a t a v a l id g t a v q v t a( a ) 4 5 55 ns 3 c h i p en a b l e a cc e s s t i m e t o d a t a v a l i d t e l q v t a(e) 4 5 55 ns 4 o u t p u t e n a b l e a c c es s t i me t o d at a v a l id t glqv t a ( g ) 2 0 25 ns 5e h i gh to ou t p u t i n h i g h -z h t ehqz t d i s(e) 1 5 20 ns 6g hig h t o out p u t i n h i g h -z h t g h qz t d is(g) 1 5 20 ns 7e l o w t o o u t p ut in l o w - z t e l q x t en(e) 5 5 n s 8g l ow t o o u tp u t i n l o w - z t glqx t e n ( g ) 0 0 n s 9 ou t p u t h o ld t i m e a ft e r a d d r e ss c h a n ge t ax q x t v ( a ) 3 3 n s 10 ch i p e n a b l e t o p o w e r a ct i v e e t eli c ch t pu 0 0 n s 1 1 ch i p dis a b l e t o p o w er s t a n d by d, e t ehi c cl t pd 4 5 55 ns
26 1 d e c e m b e r 1 2 , 1 9 97 ul634h256 a d v anced i nform a t i o n re a d cy c le 1: a i -c o ntro l l e d ( d uri n g r e a d cyc l e: e = g = v il , w = v ih ) f re a d cycle 2: g -, e -c o ntro l led (dur i ng r e a d c y c l e : w = v ih ) g no. s w it c hi n g c h ar a ct e ris t ics w r i te c y c le sy m b ol 4 5 5 5 u n i t a lt. # 1 a lt. # 2 iec m i n. m a x. m in. m a x . 12 w r i t e c y c l e t i m e t avav t avav t cw 4 5 55 ns 1 3 w r ite p u lse w i d t h t w l w h t w(w) 3 0 40 ns 1 4 w r i t e p u l s e w i d t h s e t u p t i m e t wleh t s u ( w ) 3 0 40 ns 15 ad d r e ss s e t u p t i m e t a v w l t a v e l t su( a ) 0 0 n s 16 ad d r e s s v a l id t o e n d o f w r i te t a v w h t a v e h t su( a - w h ) 3 0 40 ns 1 7 c h i p e n a b l e s e t u p t i me t e l w h t su(e) 3 0 40 ns 1 8 c h i p e n a b l e t o e n d of w r i t e t eleh t w (e) 3 0 40 ns 19 d a t a s e t u p t i m e t o end o f w r i te t d v w h t d v e h t s u ( d ) 1 5 2 0 ns 20 d a t a h o ld t i m e a f t e r e n d o f w r i t e t wh d x t eh d x t h( d ) 0 0 n s 21 ad d r e ss h o ld a ft e r end o f w r i te t wh a x t e h a x t h( a ) 0 0 n s 22 w l o w t o o u t p u t i n h i g h - z h, i t wlqz t dis(w) 15 20 n s 23 w h i gh to ou t p u t i n l o w - z t w h qx t e n ( w ) 5 5 n s t a( a ) p r e v i ous d a t a v a l id o u t p u t d a ta v a l i d t cr a ddre s s v a lid t v ( a) aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa ai dqi o u tp u t 1 2 9 ai e g dqi o u t p u t t d is( e ) t cr t a( e ) t en( e ) t e n (g) t a( g ) t d i s( g ) o u t p u t d a ta v a l i d high i mp e d a n ce i cc a c t i v e s t a n d b y t pd t pu 1 3 4 5 7 6 8 10 11 t a( a ) 2 add r e s s v al i d aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa
2 6 2 d e c e m b e r 1 2 , 1 9 9 7 ul634h256 advanced information aaaa a aaa a aaa a aaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaa a aaa a aaa a aaaa aaaa a aaa a aaa a aaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa a a a a a aaaa a aaa a aaa a aaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa a a a a a l - t o h - l e v e l u n d e f i n e d h- to l - l e v e l i : i f w i s l o w and w h en e g o e s l o w , t h e o u tp u t s re m a i n i n t h e h igh imp e d a n c e s t a t e . j: e or w m u s t b e v ih d u ri n g a d dr e ss tr a n si t i o n . write c y c l e # 1 : w -c o ntr o ll e d j t h ( d) t cw t s u (e) t h ( a) t w( w ) t s u (d) t d is( w ) t en( w ) add r e s s v al i d i n p u t d a ta v a l i d high i m p e d a n ce aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa t s u( a - w h ) 12 16 13 19 2 0 23 21 t s u( a ) t h( d ) t cw t w ( e) t h ( a) t s u (d) i n p u t d a ta v a l i d t su ( w) 12 18 21 2 0 19 17 22 pr e vi o u s d a ta aaaa aaaa aaaa aaaa aaa aaa aaa aaa 15 14 high i mp e d a n ce 15 t s u ( a ) a ddr e s s v al i d aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aa aa aa aa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aa aa aa aa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaa aaa aaa aaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa a a a a write c y c l e # 2 : e -c o ntro l l ed j ai e w d q i i n p ut d q i o u tp u t ai e w d q i i n p ut d q i o u tp u t
2 6 3 d e c e m b e r 1 2 , 1 9 97 ul634h256 a d v anced i nform a t i o n non v o l a tile m e m o r y op er a t i o ns m ode s electi o n k : t h e six c o n s e c u tive a d d r e s s e s m u st be in o r d e r l i s t e d ( 0 e 3 8 , 3 1 c 7 , 0 3 e 0 , 3 c 1 f , 303 f , 0 f c 0 ) fo r a s t o r e c y c l e o r ( 0 e38 , 3 1 c 7 , 0 3 e0 , 3 c 1 f , 303 f , 0 c 6 3 ) f o r a r e c a l l c y c l e . w m u st be h i g h d u r i n g a ll six c o n s e c u tive c y c le s . s e e s t o re c y cle a n d r e c a l l c y cle t abl e s a n d d i a - gr a ms f o r f u r t h e r d e t a ils. t h e f o ll o wi n g s i x - a ddre s s s e q uen c e i s u s e d f o r t e s t i n g purp o s e s a nd s h o uld n o t be u s e d: 0 e 3 8 , 3 1 c 7 , 0 3 e 0 , 3 c 1 f , 3 0 3 f , 3 3 9 c . l : i / o s t a t e a s s u m e s t h a t g v il . a c t iv a ti o n o f n o n v o l a t i l e c y c les d o e s n o t dep e n d o n t h e s t a t e o f g . m : h s b ini t ia t e d s t o re op e r a ti o n a c t u ally o cc u rs o n l y if a w r ite h a s be e n d o n e si n c e la s t st o re o p e r a ti o n . a f t e r t h e s t o re (if a n y ) c o mple t e s , t h e p a rt wil l g o i n t o s t a n d b y m o de i n h i b i t i n g a l l o p e r a t i o n u n til h s b ris e s. n: t r e s tore s t a rts fr o m t h e ti m e v cc ris e s ab o v e v s w i tch . o: h s b is a n i / o t h a t h a s a w e e k i n t e rn a l p u ll u p; i t is b a sic a lly a n op e n dr a in o u tp u t. it is m e a n t t o a l l o w u p to 3 2 u l 6 3 4 h 2 5 6 t o be g a ng e d t o g e t h e r f o r sim u lt a n e o u s s t o r i n g. do n o t u s e h s b t o p u l l u p a n y e x t e r n a l circ u i t r y o t h e r t h a n o t h e r u l 6 3 4 h 2 5 6 h s b p i ns. e w h s b a 1 3 - a 0 (h e x) m o de i /o p o w er n ot e s h x h x n o t s e l e c t e d ou t p u t h i g h z s t a n d b y l h h x r e a d s ram ou t p u t d a t a act i v e l l l h x w rite s r a m i n p u t d a t a act i v e l h h 0 e 3 8 3 1 c 7 0 3 e 0 3 c 1f 3 0 3f 0 f c 0 r e a d s r a m r e a d s r a m r e a d s r a m r e a d s r a m r e a d s r a m n o n v o l at i l e s t o r e o u t p u t d a ta o u t p u t d a ta o u t p u t d a ta o u t p u t d a ta o u t p u t d a ta ou t p u t h i g h z act i v e k , l k, l k, l k, l k, l k l h h 0 e 3 8 3 1 c 7 0 3 e 0 3 c 1f 3 0 3f 0c 6 3 r e a d s r a m r e a d s r a m r e a d s r a m r e a d s r a m r e a d s r a m n o n v o l a t i l e r e call o u t p u t d a ta o u t p u t d a ta o u t p u t d a ta o u t p u t d a ta o u t p u t d a ta ou t p u t h i g h z act i v e k , l k, l k, l k, l k, l k x x l x s t ore/ i n h i b it ou t p u t h i g h z i c c 2 / s t a n d b y m no. powerstore power up recall/ h a rd w are c o ntro l led s t o re sym b ol c o nd i tio n s m in. m a x. u n i t alt. iec 2 4 p o wer up reca l l d u r a t i o n n , e t restore 6 5 0 m s 2 5 s t ore c y c l e d u r a t i o n t hlqx t d( h ) s v cc > 2.7 v 10 m s 2 6 h s b l o w t o i n h i b i t on e t h l q z t dis(h)s 1 m s 2 7 h s b hi g h t o in h i b i t o f f e t hhqx t e n ( h ) s 7 0 0 ns 2 8 e x t e r n a l s t o r e p u l s e w i d t h e t h l h x t w(h)s 20 ns hsb ou t p u t l ow c u r r e nt e , o i h s b ol hsb = v ol 1 . 8 m a hsb ou t p u t h i g h cu r r e n t e, o i h s b oh hsb = v il 5 6 0 m a l o w v o l t a ge t r i g g e r l e vel v sw i t c h 2 . 4 2 . 7 v
2 64 d e c e m b e r 1 2 , 1 9 9 7 ul634h256 advanced information powerstore and automatic power up recall h ard w a re con t r o ll e d s t o r e dqi o u tp u t p r e v io u s d a t a v a l i d hsb t en( h )s t d ( h)s d a t a v alid t d is( h )s p : t pd s to r e appr o xim a t e t d ( e)s o r t d( h )s ; t d e l a y appr o xim a t e t di s (h ) s . q : a f t e r t w (h ) s h s b i s h o l d d o w n i n t e r n a l b y s t o r e o p e ra t i o n . r : a n a u t o m a tic r e c a l l a lso t a k e s p l a c e a t p o w e r u p, s t ar t ing w h e n v cc e x c e e d s v s w it c h a n d t a k es t r e s to r e . v cc m u st n o t d r o p b e l o w v s w it c h o n c e it h a s b e e n e x c e e d e d f o r t h e r e c a l l t o f u n c ti o n pr o perl y . s : o n c e t h e s o f t w a r e c o n t r o ll e d s t o r e o r r e c a l l c y c l e is i n i t i a t e d , i t c o mpl e t e s a u t o m a tic a ll y , ig n o r i n g a ll i n p u t s . t : n o i s e o n t h e e pin m a y t r igg e r m u ltiple r e a d c y c les f r o m t h e s a me a d d r e ss a n d a bort t h e addr e ss s e q u e n c e . no. s oft w a r e c o ntro l led s t o re/ r e c a ll c y c le s y m b ol 45 5 5 u n it a l t . i e c m i n . m a x . m i n . m a x . 2 9 s t ore / reca l l i n i t i a t i o n t i m e t avav t cr 45 5 5 ns 3 0 c h i p e n a b l e t o o u tp u t i n a c t i v e s t elqz t d is(e)sr 6 0 0 6 00 ns 3 1 s t ore c y c l e t i m e t elq x s t d (e)s 10 10 ms 3 2 r e call c y c l e t i m e r t e l q x r t d(e)r 20 20 m s 33 a d d r e s s s e t u p t o c h i p e n a b l e t t a v e l n t su( a )sr 0 0 n s 3 4 c h i p e n a b l e p u lse w i d th s , t t ele h n t w (e)sr 30 4 0 ns 35 c h i p d i s a b l e t o a d d r e s s c h a n g e t t eh a x n t h( a )sr 0 0 n s t w( h )s q 28 26 27 25 h i gh i mp e d a n c e a a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa v c a p 3 .0 v t powerstore p o wer up v sw i t c h w dqi po w e r u p reca l l b r o w n out t restor e t r est o r e bro w n o u t powerstore ( n o sram w r i t e s) rec a l l 24 24 no s t ore t pdstore p t de l a y p
2 65 d e c e m b e r 1 2 , 1 9 97 ul634h256 a d v anced i nform a t i o n aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaa aaa aaa aaa u : i f t h e c h i p e n a ble pul s e width i s l e ss t h e n t a( e ) (s e e r e ad c y cl e ) b u t gr e a t e r t h a n o r eq u a l t o t w (e ) sr , t h e n t h e d a t a m a y n o t b e v a l i d a t t h e e n d o f t h e l o w p u ls e , h o w e v e r t h e s t o re o r r e c a l l w i ll still b e ini t ia t e d . v : w m u s t b e h i g h w h e n e i s l o w d u ri n g t h e a ddre s s s e q uen c e i n ord e r t o i n iti a t e a n o n v o l a tile c ycl e . g m a y b e e it h e r h i gh o r l o w t h r o u g h o u t . addr e s s e s 1 t h r o u gh 6 a re f o u n d i n t h e m o de s e l e c t i o n t a bl e . a ddr e ss 6 d e t e rmi n e s w h e t h e r t h e u l 6 3 4 h 2 5 6 p e r f orms a st o r e o r r e c a l l . w : e m u s t b e u s e d t o c l o c k i n t h e a ddr e s s s e q u e n c e f o r t h e s o f t w a r e c o n t r o lled s t o r e a n d r e c a l l c y c l e s aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaa aaa aaa aaa aaa t cr t w ( e) s r a d d r e s s 1 v a l i d s o f t w a r e c o n tr o l l e d s t o r e /rec a l l c y c le t, u, v , w (e = h i gh a f te r s t o r e in i ti a tio n ) a dd r e s s 6 t cr 29 29 t h( a ) s r 35 34 t s u( a ) s r 33 aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaa aaa aaa aaa t cr t w ( e) s r a d d r e s s 1 v a l i d v a l i d a ddr e s s 6 t d (e ) s / t d( e )r 31 3 2 / 29 t h( a ) s r 35 34 t s u( a ) s r 33 t d is( e )sr 30 t h ( a ) sr 35 t s u( a ) s r 33 t w( e )sr t h( a ) s r 35 34 t s u( a ) s r 33 5 t dis ( e) s o f t w are c o nt r o l l e d s t o re / rec a ll c y c l e t, u, v , w (e = l o w aft e r s t o re ini t iat i on) t d is( e )sr 30 aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaa aaa aaa aaa v a l i d high i m p e d a n c e high i m p e d a n c e ai e dqi o u tp u t ai e dqi o u tp u t t d(e ) s / t d( e )r 31 3 2 /
2 66 d e c e m b e r 1 2 , 1 9 9 7 ul634h256 advanced information b e s d c l a ss b l a n k > 2 0 00 v z b > 1 0 0 0 v s u l 6 3 4 h 2 5 6 45 c e x a m p le i c code n u m b e rs t y p e p a c k a g e o p e rat i ng t e m per a ture r a nge c = 0 t o 7 0 c k = - 4 0 t o 8 5 c a c c e ss ti m e 4 5 = 4 5 ns 5 5 = 5 5 ns (on special request) t h e d a t e o f m a n u f a c t u r e is g i v en b y t h e l a s t 4 d ig i t s o f t h e m a r k , t h e f i r st 2 di g i t s in d ic a ti n g t h e y e a r , a n d t h e l a s t 2 d i g i t s t h e c al e n d a r we e k . z : e s d p r o t e c t i on > 2 000 v u n d e r d e v e lopm e n t s = s o p ( 3 0 0 m i l) t = tsop( t y p e i ) a l l p i n s n o t u n der t e st m u st be c o n n e c t ed with gr o u n d b y c a p a c i t o r s . c a p a c i ta n ce e c o nd i tio n s sym b ol m i n . m a x. unit i n p u t c ap a c i t a n c e v cc v i f t a = 3 . 0 v = v ss = 1 m h z = 2 5 c c i 8 p f o u t p ut c a p a c i t a n ce c o 7 p f v c c x y v cap t e st co n fig u rat i on f or f un c tio n a l ch e ck v ih v il v ss 1 . 1 k 950 30 pf x v o si m u l t an eous m e a s ur e - m ent of a l l 8 out put p i ns i npu t l e v e l ac c o r d i ng t o t h e r e l e v ant t e s t m eas ur em ent d q 0 d q 1 d q 2 d q 3 d q 4 d q 5 d q 6 d q 7 hsb x : i n m e a s u r e m e n t o f t dis - t im e s a n d t en - t im e s t h e c a p a cit a n c e is 5 p f . y : b e t w e e n v cc a nd v ss m u st be c o n n e c t e d a high f req u e n c y b y p a ss c a pa c it o r 0 . 1 m f t o a v o i d dis t u r b a n c e s. a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 a 1 0 a 1 1 a 1 2 hsb e w g 3 v a13 a 1 4
2 67 d e c e m b e r 1 2 , 1 9 97 ul634h256 a d v anced i nform a t i o n device o p er a tion t h e u l 6 3 4h 2 5 6 h as t w o s e p a r a t e m o d e s of o p e r a t i o n: sram m o d e a n d n o n v o l a t i l e m o d e . t h e m e m o r y o p e- r a t e s i n sram m o d e a s a s t a n d a rd f a st s t a tic ra m . d a t a i s t r a n s f er r ed i n n o n v o l a ti l e m o d e f r o m sram t o eeprom ( t h e s t ore o p e r a t i o n ) o r f r o m ee p rom t o sram (t h e rec a l l o p e r a t i o n). in t h is m o d e sram fu n cti o ns a r e d i s a b l e d . s t or e c y c l e s m a y b e i n i t i a t e d u n d e r u s e r c o ntr o l v i a a s o f t wa r e s eq u e n c e o r h s b a ss e rti o n a n d a r e a l so a u t o- m a t i c a l l y in i t i a t e d w h e n t h e p o w e r s u p p l y v o l t a g e l e v e l of t h e c h i p f a lls b e l o w v swi t ch . rec a l l o p e r a t i o n s a r e a u t o m a tic a l l y i n i t i a t e d u p on p o w e r u p a n d m ay a lso o c c u r w h en t h e v c c x ris e s a b o v e v s w i t c h , af t e r a l o w p o w e r c o n d i t i o n . rec a l l c y c l e s m a y a l s o b e i n i t i a t e d b y a s o f t w a r e s e q u e nc e . sr a m re a d t h e u l 6 3 4h 2 5 6 p e rf o r m s a read c y c l e w h e n e v e r e a n d g a r e lo w a n d h s b a n d w a r e h igh. t h e a d d r e s s s p ecifi e d o n p i ns a 0 - a 1 4 d e t e rm i n e s w h i ch o f t h e 3 2 7 6 8 d a t a by t e s w i l l b e a c c e s s ed . w h e n t he read i s i n i t i a t ed b y a n a d d r e s s t r a n sit i o n , t h e o u t p u t s w i l l b e v a l i d a f t e r a d e l a y o f t cr . i f t h e re a d is i n i t i a t e d by e or g , t h e o u t p u t s w i l l be va l i d a t t a(e) o r a t t a(g) , w h i c h e v e r i s l a t e r . t h e d a t a o u t put s w i l l r ep e a t e d ly r e s p o n d t o a d d r e s s c h a n g e s w i t h i n t h e t cr a c c e s s t i me w it h o u t t h e n e e d f o r tr a nsit i on o n a n y c o n t r o l i n p u t p i ns, a n d w i l l r e m a in v a l id u n t il a n o t h e r a d d r e ss c h a n g e or u n til e o r g is b r o u g h t hig h o r w or h s b i s b r ou g ht lo w . sr a m wr i te a w r i t e c y cle i s p e r f o r m e d w h e n e v er e a n d w a r e lo w a n d h s b i s high. t h e a d d r e s s i n p u t s m u s t b e s t a b l e p r i o r t o e n t e ri n g t h e w r i t e c y cle a n d m u s t r e m a in st a b l e u nt i l e it h er e or w g o e s hig h a t t h e e n d o f t h e c y c l e . th e d a t a o n p i ns dq0 - 7 w i l l b e w r i t t e n i n t o t h e m e m o r y i f i t i s v a l i d t s u ( d ) b e f o r e t h e e n d o f a w c o n t r o l l e d writ e o r t s u ( d ) b e f o r e t h e e n d of a n e c o n - t r o l l e d w rite. i t i s r e c o m me n d e d t h a t g is k e p t h igh d ur i n g t h e e n- tire w r i t e c y cle t o a v o id d a t a b u s c o n t e n t i o n on t h e c o m m o n i/o l i n e s . i f g i s l e f t l o w , i n t e r n a l c i r c u i t r y w i ll turn o f f t h e o u tp u t b u f f e r s t dis( w ) a f t e r w g o es lo w . au t om a t i c s t ore dur i n g n o r m al o p e r a t i o n , t h e u l 6 3 4h 2 5 6 w i l l d r a w cur- r e n t f r o m v c c x t o c h a r g e u p a c ap a c i t o r c on n e c t e d to the v c a p p i n . t h i s s t o r e d c h a r g e w i l l b e u s e d b y t he c h i p t o p e r f o r m a si n g l e s t ore o p e r a t i o n . i f t h e v o lt a g e o n t h e v c c x p i n d r o p s b e l o w v s w i t c h , t h e p a rt w ill a u t o m a tic a l l y d i s c o n n e c t t h e v c a p p i n f r o m v ccx a n d i n i t i a t e a s t o r e o p e r a t i o n . f i g u r e 1 sh o w s t h e p r o p e r c o n n e cti o n of c a p acit o r s f o r a u t o m a ti c s t ore o p e r a t i o n . th e c h a r g e s t o r a g e c a p a - c i t or s h o u ld h a v e a c a p a c i t y o f a t l e a s t 1 0 0 m f ( 2 0 %) a t 6 v . e a ch ul 6 3 4 h2 5 6 m u s t h a v e it s o w n 1 0 0 m f c a p a c i t o r . e a c h u l 6 3 4 h 2 56 m u st h a v e a h i g h q u a l ity, h i g h f r e - q u e ncy b y p a s s c a p a cit o r o f 0 .1 m f c on n e c t ed b e t we e n v c a p a n d v ss , us i ng l e a d s a n d t r a c e s t h at a r e s h ort as p o ssi b l e . this c a p a c i t o r d o e s n o t r e p l a c e t h e n o r m a l ex p e c t e d h i g h f r e q u e n c y by p a s s c ap a c i t o r b e t w e e n t h e p o w e r s u p p l y v ol t a g e a n d v ss . i n o r d e r t o p r e v e n t u n n e e d e d s t o r e o p e r a t i o n s , a u t o- m a tic s t o r e s as we l l as t h o s e i n i t i a t e d b y e x t e r n a l l y d ri v i n g h s b l o w w i l l b e i g n o r e d u n l e s s a t l e a s t o n e w rite o p e r a t i o n h a s t a k e n p l a c e si n c e t h e m o st r e c e n t s t or e c y c l e . n o t e t h a t i f hsb is d r i v e n l o w v i a e x t e r n al c i r c u it r y a n d n o w r i te s h a v e t a k e n p l a c e , t h e p a rt w i l l sti l l b e d i s a b l e d u nt i l hsb i s a l l o w e d t o r e t u rn high. s o ft w a r e i n i t i a t e d s t or e c y c l e s a r e p e r- f o r m e d r e g a r d l e s s of w h e t h e r o r n o t a w r i te o p e r a - t i o n h a s t a k e n p l a c e. a u t o m a tic r ec a ll d u ri n g p o wer u p , a n a u t o m a tic reca l l t a k es p l a c e . a t a l o w p o w e r c on d i t i o n ( p o w e r s u p p l y v o l t a g e < v s w it c h ) an i n t er n al r e call r e q u e st m ay b e l a t c h e d . a s s o on as p o w e r s u p p l y v o l t a g e e x c e e d s t h e s e n se v o lt a g e o f v s w it c h , a r e q u est e d r e call c y c l e w i l l a u t o m a tic a l l y b e i n it i a t e d a n d w i l l t a k e t res t o r e t o c o m - p l e t e. i f t h e u l 6 3 4h 2 56 i s in a w r i t e s t a t e at t h e e n d o f p ow e r u p reca l l , t h e s ram d a t a w i l l b e c o rr u p t e d . t o h e l p a v o i d t h i s s i t u a t i o n , a 1 0 k w r e s i s t or sh o u l d b e c o n n ect e d b e t w e e n w a n d p ow e r su p p l y v o l t a g e. s o f t w a r e n o n v ol a t i le s t o r e t h e u l 6 3 4 h 2 5 6 s o f t w a r e c o n t r o l l e d s t ore c y c l e is i n i t i a t e d b y e x e c u t i n g s e q u e n t i a l r e a d c y c l e s f r o m s i x s p e ci f i c a d d r e s s l o c a t i o n s . b y r e l y i n g o n r e a d c y c l e s o n l y , t h e u l 6 3 4 h2 5 6 i m p l e m e nt s n o n v o l a t i l e o p e r a t i o n w h i l e r e m ai n i n g c o m p a t ib l e w i th st a n d ard 3 2 k x 8 s ra m s . du r i n g t h e s t ore c y c l e , a n e r a s e o f t h e p r e - v i o us n o n v o l a t i l e d a t a i s p erf o r m e d f i rst, f o l l ow e d b y a p a r a l l e l p r o g r a m m i n g o f a l l n o n v o l a t i l e e l e m e n t s . o n c e a s t or e c y c l e is i n i t i a t e d , furt h e r i n p u ts a n d o u t p uts a r e d i s a b l ed u nt i l t h e c y cle i s c o m p l e t e d. b e c au s e a s eq u e n c e o f a d d r e s s e s i s u s ed f o r s t o r e i n i t i a t i o n , i t i s i m p o r t a n t t h a t n o o t h e r read o r write ac c e s s e s i n t e r v e ne i n t h e s e q u e n c e o r t h e s e q u e n c e w i ll be a b o rt e d . t o i n i t i a t e t h e s t ore c y c l e t h e f o l l o w i n g r ead s e q u e n c e m us t b e p e r f o r m e d :
2 6 8 d e c e m b e r 1 2 , 1 9 9 7 ul634h256 advanced information 1 . r e a d a d d r e ss 0 e38 ( h e x ) v a lid r e a d 2 . r ea d a d d r e s s 3 1 c 7 ( h e x ) v a l i d r e ad 3 . r e a d a d d r e ss 0 3e0 ( h e x ) v a lid r e a d 4 . r ea d a d d r e s s 3 c 1 f ( h e x ) v a l i d r e ad 5 . r e a d a d d r e s s 3 0 3 f ( h e x ) v a l i d re a d 6 . r ea d a d d r e s s 0 f c 0 ( h e x ) i n i t i a t e s t o r e o n ce t h e si x th a d d r e s s in t h e s e q u e n c e h a s b e en e n t e r e d , t h e s t or e c y c l e w i l l c o m m e n c e a n d t h e c h i p w i l l b e d i s a b l e d . i t is i m p o r t a n t t h a t read c y c l e s a n d n o t w r i t e c y c l e s a r e u s e d i n t h e s e q ue n c e , al t h o u g h it i s n o t n e c e s s a r y t h a t g i s l o w for t h e s e q u e n c e t o b e v a l i d . aft e r t h e t s t o r e c y c l e t i m e h a s b e e n fulfi l l e d , t h e sr a m w i l l a g a i n b e a c t i v a t e d f o r r e ad a n d w rite o p e r at i o n . s o f t w ar e non v o l a t i l e r e c a l l a rec a l l c y c l e o f t h e e eprom d a t a i n t o t h e sram i s i n i t i a t e d w i t h a s e q u e n c e o f r ea d o p e r a t i o n s i n a m a n n e r s i mi l ar t o t h e s t o r e i n i t i a t i on . t o i n i t i at e t h e rec a l l c y c l e t h e f o l l o w i n g s e q u e n c e o f r e a d o p e r a - t i o n s m us t b e p e r f o r m e d: 1 . r e a d a d d r e ss 0 e38 ( h e x ) v a lid r e a d 2 . r ea d a d d r e s s 3 1 c 7 ( h e x ) v a l i d r e ad 3 . r e a d a d d r e ss 0 3e0 ( h e x ) v a lid r e a d 4 . r ea d a d d r e s s 3 c 1 f ( h e x ) v a l i d r e ad 5 . r e a d a d d r e s s 3 0 3 f ( h e x ) v a l i d re a d 6 . r e a d a d d r e s s 0 c6 3 ( h e x ) i n i t i a t e reca l l i n t e r n a l l y , rec a l l is a t w o s t e p p r o c e d u r e . f irst, t h e s r a m d a t a i s c l e a r e d a n d s e c o n d , t h e n o n v o l at i l e i n f o r m a t i on is t r a n s f e r r e d i n t o t h e sr a m c e lls. the rec a l l o p e r a t i o n i n n o w a y a l t e rs t h e d a t a i n t h e e e prom c e l ls. t h e n o n v o l a t i l e d a t a c a n b e r e c a l l ed a n u n l i m i t e d n u m b e r o f t i m e s . hsb non v o l a t i l e s t ore t h e h a r d w a r e c o n t r o l l e d s t ore b u s y p i n (h s b ) is c o n n e c t e d t o a n o p e n d r a i n circ u i t a c t i n g a s b o t h i n p u t a n d o u t p u t t o p e r f o r m t wo d i f f e r e n t f u n c t i o n s . w h e n d r i v e n l o w b y t h e i n t e r n a l c h i p circu i t r y i t i n d i c a t e s t h a t a s t ore o p e r a t i o n ( i n i t i a t e d v i a a n y m e a n s) is i n p r o - g r e s s w i t h i n t h e c h i p . w h e n d r i v e n l o w b y e x t e r n a l c i r - c u i t r y f o r l o n g e r t ha n t w(h)s , t h e c h ip w i l l c o n d it i o n a l l y i ni t i a t e a s t o r e o p e r at i on a f t e r t dis(h)s . r e a d a n d w r i t e o p e r a t i o n s t h a t a r e i n p r og r ess w h e n h s b i s d ri v e n l o w ( e i t he r b y i n t e r n a l o r e x t e r n a l circu i t r y ) w i l l b e a l l o w e d t o c o m p l e t e b e f o r e t h e s t o r e o p e r a t i o n i s p e r f o r m e d, in t h e fo l l o w i n g m a n n e r . aft e r h sb g o e s l o w , t h e p a rt w ill c o nt i n u e n o r m al sr a m o p e r a t i o n f o r t d i s(h)s . d u ri n g t dis(h)s , a t r a n sit i on o n a n y a d d r e s s or c o n t r o l sig n al w i ll t er m i n a t e sram o p e r a t i o n a n d c a u s e t h e s t or e t o c o m m e n c e . n o t e t h a t i f a n s r a m w r i t e i s a t t e m pt e d a f t e r h s b h a s b e e n f o r c e d l o w , t h e wr i te w i l l n o t o ccur a n d t h e s t or e o p e r a t i o n w i ll b e g i n i m m e d i a t e l y . hard w are-s t ore - busy ( h sb ) i s a h i g h s p e e d , l o w d r i v e c a p a b il i t y b i d i r e c t i o n al c o n tr o l l i n e . i n o r d e r t o al l o w a b a nk o f u l 6 3 4 h 25 6 s t o per f o r m s yn- chr o n i z e d s t ore fu n c t i o ns, t h e hsb p in f r o m a n u m - b er of c h i p s m a y b e c o n n ect e d t o g et h e r . e a c h c h ip c o n t a ins a s m a l l i n t e r n al c u r r e n t s o urce t o p u ll h s b hig h w h en it i s n ot b e i n g dr i v e n l o w . t o d e c r e a s e t h e s en s i t i v i t y o f t h i s s i g n a l t o n o i s e g e n e r a t ed o n t h e pc b o a rd , i t h a s t o b e p u l l e d t o p o w e r s u p p l y v i a a n e x t er- n a l r e s i s t o r w i t h a v a l u e such t h a t t h e c o m b i n e d l o a d o f t h e r e sist o r a n d a l l p a r a l l el c h i p c o n n ect i o n s d o e s n ot e x c ee d i h s b ol a t v ol (s e e f i g u r e 1 a n d 2 ) . i f hsb is to b e c o n n e ct e d t o e x t er n al c i rcu i t s o t h e r t h an o t h e r u l 6 3 4 h2 5 6s, a n e x t e r n a l p u l l -up r e s i s t o r h a s t o b e u s ed. d u r i n g a n y s t o r e o p e r a t i o n , r e g a r d l e s s o f h o w i t w a s i n i t i a t ed , t h e u l 6 3 4 h 2 5 6 wi l l c on t i n u e t o d ri v e t he h s b p i n l o w , r e l e a s i n g i t o n l y w h e n t h e s t ore is c o m - p l e t e. u p on c o m p l e t i o n o f a s t or e o p e r a t i o n , t h e p ar t w i l l b e d i s a b l e d u n t i l h s b actu a l l y g o es h i g h . ha r d w a r e p r o tecti o n t h e u l 63 4 h 2 5 6 o f f e r s h a r d w a r e p r o t e c t i o n a g a i n s t i n a d v er t e n t s t or e o p e r a t i o n d u r i n g l o w v o l t a g e c o n d i - t i o n s. w h en v c a p < v s w it c h , a l l s o f t w a r e or h s b i n i t i a - t e d s t ore o p e r a t i o n s w i l l b e i n h i bi t e d . pr e ve n t i ng a ut o m a t i c s t o res t h e powerstore function can be disabled on the fly by h o l d i n g h s b h igh w i t h a d r i v e r c a p a b l e o f s o u r c i n g 1 5 m a a t v oh o f at l e a s t 2 . 2 v as i t w i l l h a ve t o o v e r p o - w e r t h e i n t e r n a l p u l l - d o w n d e v i ce t h a t dr i v e s h s b low f o r 5 0 ns a t t h e o n s e t o f a powerstore . w h e n t h e u l 6 3 4 h 2 5 6 i s c o n n e c t e d f o r powerstore o p e r at i on ( s ee f i g u r e 1 ) a n d v c c x cr o ss e s v swi t ch on t h e w a y d o w n , t h e u l 6 3 4h 2 56 w i l l a t t e m p t t o p u ll h s b l o w ; i f h s b d o e s n t a c t u a l l y g e t be l o w v il , t h e p a r t w i l l st o p t r y i ng t o p ull h s b l o w a nd a b o r t t h e powerstore a tt e m p t . di s abel i ng a ut o m a t i c s t o res if t h e powerstore function is not required, then v c a p sh o u l d b e t i ed d i r e c t l y t o t h e p o w er s u p p l y a nd v c c x s h o u l d b y t i e d t o g r o u n d . i n t h is m o d e , s t ore o p e r a - t i on m ay b e t r i g g e r e d thr o u g h s o f t w a r e c o n t r o l or t h e hsb p i n . in e i t h e r e v e nt, v c a p ( pin 1 ) m u st a l w a y s h a v e a p r op e r b y p a s s c ap a c i t o r c o n n e c t e d t o i t ( f i g u r e 2 ) .
2 6 9 d e c e m b e r 1 2 , 1 9 97 ul634h256 a d v anced i nform a t i o n l o w a ver a ge a c t i v e p o w er t h e u l 6 3 4 h 2 5 6 h a s b e e n d e s i g n e d t o d r a w s i g n i f i- c a n t l y l e s s p o w e r w h e n e is l o w ( c h ip e n a b l e d) b ut t h e a c c e s s c y c l e t i m e i s l o n g e r t h an 5 5 ns. w h e n e is h i g h t h e c h i p c o n s u m e s o n l y s t a n d b y c u r- r e n t . t h e o v e r a l l a v e r a g e c u rr e n t d r a w n b y t h e p art d e p e n d s o n t h e f o l l o w i ng it e m s: + 0 . 1 m f b y p a s s 1 0 0 m f 20 % v c a p v ss po w e r su p p l y v c c x h s b 1 0 k w (op t i o n a l, fi g ure 1: a u t o m a tic s t o r e o p e r a t i o n sch e m at i c di a g r a m 1. cmos o r ttl i n p ut l e v e ls 2 . t h e t i m e d u r i n g wh i c h t h e c h i p i s d i s ab l ed ( e high) 3 . t h e c y c l e t i m e f o r a c c es s e s ( e l o w ) 4 . the r a tio o f r e a d s t o w r i t e s 5. the o p e r a t i n g t e m p e r a ture 6 . t h e p o w e r su p p l y v o l t a g e l e v el e x t e r n a l circ u i t r y ) 32 2 31 4 29 5 28 3 30 6 27 7 26 8 25 12 21 9 24 10 23 11 22 13 20 14 19 15 18 16 17 a a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa v c a p 3.0 v s t ore i n h i b i t p o wer up v swi t c h t restore reca l l 24 t d i s a b e l i n g au t o m a tic s t o r es : s t o re c y cle i n h i b i t and a ut o m a t i c p o w e r u p rec a ll 1 m a n d ato r y i f h s b is u s e d with 0. 1 m f b y p a s s v c a p v ss p o w er s u pply v c c x h s b 10 k w ( o pti o n al, f ig u r e 2 : d i s a b el i n g a u t o m a t i c s t o res s c h e m a tic d i a g r a m e x t e r n a l c i r c u i t r y ) 32 2 31 4 29 5 28 3 30 6 27 7 26 8 25 12 21 9 24 10 23 11 22 13 20 14 19 15 18 16 17 1 m a n d a t o r y i f h s b is u s e d with

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