SB61L256A silicon-based technology 32,768 x 8-bits v e r y high speed and low pow e r mem o r y static cmos ram prelim ina r y d escript i on: t he SB61L256A ser i es pr oduct s ar e 32, 768- w o r d s by 8- bit s st at ic ram s f abr icat ed w i t h adv anced 8" w a f e r subm icr on cm o s t e chnolog y . using uniq ue cm o s per ipher al cir c uit s and special poly - load 4- t r ansist o r m e m o r y cells, t he SB61L256A ser i es pr oduct s ex hibit v e r y hig h - s peed per f o r m ance w i t h sing le +5- v olt pow er supply w h ile r e q u ir ing v e r y low pow er and no clock or r e f r eshing t o oper at e. t he SB61L256A is pack ed in a st andar d 28- pin 300m il so j/ pdi p . feat ures: ? 32, 768- w o r d x 8- bit or g aniz a t i on ? sing le +5- v olt pow er supply ? fully st at ic oper at ion no clock or r e f r eshing r e q u ir ed ? lvt t l - c om pat ible input s and out put s ? common i/o capability ? low pow er consum pt ion act i v e : 180/ 160/ 140 m a ma x . st andby : 5 m a ? ver y hig h speed access: 8/ 10/ 12 ns ma x . ? 28- pin plast i c 300 m il so j/ pdi p pack a g e ? o u t put enable oe av ailable f o r v e r y f a st access ord e r i n g in f o rma ti o n : p a rt n u mber p a ckage word a ccess ti m e suppl y voltage supply current ma (max .) organ iz ation ns( m ax .) ( t yp.) o p erat i n g st a n d b y SB61L256A- 8 8 180 SB61L256A - 10 28 - pi n pl ast i c soj / di p 32k 8 bits 10 5v 5% 160 5 SB61L256A - 12 300 m i l 12 140 t h e in f o rm atio n in th is d o c u m en t is su b j ect to ch an g e w ith o u t n o tice s b t silicon-based tec hnology corporation 1f,no.23, r & d r d .i, scien ce- bas e d in du s t rial p a rk , hs in ch u , t a iw an , r . o.c . t e l 886- 35- 777897 fax 886- 35- 779832 -1- www.datasheet www.datasheet www.datasheet www.datasheet 4u 4u4u 4u .com .com .com .com 4 .com u datasheet
s b t SB61L256A prelim inary pin configuration: 28-pin 300 mil soj 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 a a a a a a a a i/o vss v dd we a a a a oe a cs 14 12 7 a 6 a 5 4 3 2 1 0 1 i/o 2 i/o 3 i/o 4 i/o 5 i/o 6 i/o 7 i/o 8 10 11 9 8 13 sym b ols f unctions a 0 ? a 14 address i nputs i/ o 1 ? i/ o 8 data i nputs/outputs cs chip select i nput we w r ite enable i nput oe output enable i nput v dd power supply v ss ground -2- www.datasheet www.datasheet www.datasheet www.datasheet 4u 4u4u 4u .com .com .com .com 4 .com u datasheet
s b t SB61L256A prelim inary block diagram: row address buffer 512 row decoders memory cell array 512 rows 512 columns input data control sense/switch 512 column decoders output data control column address buffer 9 i/o 1 ? i/o 8 8 8 6 ? cs oe we 8 ? ? ? ? ? a 9 a 12 a 14 a 3 a 4 a 5 a 6 a 7 a 8 a 13 a 11 a 10 a 2 1 a 0 a t r uth t able: cs oe we mode i/o 1 ? i/o 8 v dd cu rren t h x x not selected hig h z i sb ,i sb 1 l h h output disable hig h z i dd l l h read data out i dd l x l w r ite data i n i dd -3- www.datasheet www.datasheet www.datasheet www.datasheet 4u 4u4u 4u .com .com .com .com 4 .com u datasheet
s b t SB61L256A prelim inary dc characteristics: absolute m a x i mum ratings param e ters rating uuit supply voltage to vss -0.5 to +7.0 v input/output to vss -0.5 to v dd +0.5 v allowable power dissipation 1.0 w storage tem p erature -65 to +150 operating tem p erature 0 to +70 operating characteristics: (v dd = 5v 5%, v ss = 0v , t a = 0 to 70 ) p a ram e ters sym b ols test conditions min. typ. max. unit i nput l o w voltag e v il - -0.3 - +0.8 v i nput hig h voltag e v ih - +2.6 - v dd +0.5 v i nput l eakag e current i li v in = v ss to v dd -10 - +10 a out put l eakag e current i lo v i/o = v ss to v dd , cs = v ih or oe = v ih or we = v il -10 - +10 a output l o w voltag e v ol i ol = +8.0ma - - +0.4 v output hig h voltag e v oh i oh = -4.0ma +2.8 - - v operating p o wer cs = v il , i / o = 0 ma 8 - - 180 ma supply current i dd cy cle = mi n , duty = 100% 10 - - 160 ma 12 - - 140 ma standby power supply current i sb cs = v ih , c y cl e = mi n duty = 100% - - 15 ma i sb1 cs R v dd -0.2v - - 5 ma no te: t y p i cal ch aracteristics are m easu r ed at vdd = 5 v , t a = 2 5 -4- www.datasheet www.datasheet www.datasheet www.datasheet 4u 4u4u 4u .com .com .com .com 4 .com u datasheet
s b t SB61L256A prelim inary ac characteristics: capacitances (v dd = 5v , t a = 25 , f = 1 mhz ) p a ram e ters sym b ols conditions max. unit i nput capacitance c in v in = 0v 6 pf i nput/output capacitance c i/ o v out = 0v 8 pf n o t e : t h es e param e t e rs are s a m p l e d bu t n o t 100% t e s t ed. ac t e st conditions p a ram e ters conditions i nput pulse l e vels 0v to 3v i nput rise and f a ll times 3 ns i nput and output timing reference l e vel 1.5v output l o ad c l = 30 pf , i oh /i ol = - 4 ma/8 ma ac t e st loads and w a v e forms 30 pf including jig and scope 5v output r2 = 255 ohm ? ? r1 = 480 ohm 5 pf including jig and scope 5v output r2 = 255 ohm ? ? r1 = 480 ohm (f or t cl z , t ol z , t ch z , t ohz , t wh z , t ow ) 10% 10% 3 ns 3 ns 0v 3.0v 90% 90% -5- www.datasheet www.datasheet www.datasheet www.datasheet 4u 4u4u 4u .com .com .com .com 4 .com u datasheet
s b t SB61L256A prelim inary ac performances: (v dd = 5v 5%, v ss = 0v , t a = 0 to 70 ) (1) read cy cle p a rameters s y m b o l s sb 6 1 l 2 5 6 a - 8 sb 61l 2 5 6 a - 1 0 s b 6 1 l 2 5 6 a - 1 2 u n i t min. max . min. max . min. max . r ead c y cle t i m e t rc 8 - 10 - 12 - ns address access t i m e t aa - 8 - 10 - 12 ns chip select access t i m e t ac s - 8 - 10 - 12 ns output enable to output v a lid t ao e - 5 - 6 - 7 ns chip selection to output in low z t cl z * 3 - 3 - 3 - ns output enable to output in low z t ol z * 0 - 0 - 0 - ns c h ip d e selection to output in hig h z t ch z * - 4 - 5 - 6 ns output disable to ou tput in hig h z t ohz * - 4 - 5 - 6 ns output hold from address chang e t oh 3 - 3 - 3 - ns * t h e s e param e t e rs are s a m p l e d bu t n o t 100% t e s t ed (2) write cy cle p a rameters symbols sb 61l256a-8 sb 61l 2 5 6 a - 1 0 s b 6 1 l 2 5 6 a - 1 2 u n i t min. max . min. max . min. max . write cy cle t i m e t wc 8 - 10 - 12 - ns chip selection to end of write t cw 6 - 8 - 10 - ns address v a lid to end of write t aw 6 - 8 - 10 - ns address setup t i m e t as 0 - 0 - 0 - ns write pulse width t wp 6 - 8 - 10 - ns write recov e ry t i m e t wr 0 - 0 - 0 - ns data v a lid to end of write t dw 4 - 6 - 8 - ns data hold from end of write t dh 0 - 0 - 0 - ns write to output in hig h z t wh z * - 4 - 5 - 6 ns output disable to ou tput in hig h z t ohz * - 4 - 5 - 6 ns output activ e from end of write t ow 0 - 0 - 0 - ns * t h es e param e t e rs are s a m p l e d bu t n o t 100% t e s t ed -6- www.datasheet www.datasheet www.datasheet www.datasheet 4u 4u4u 4u .com .com .com .com 4 .com u datasheet
s b t SB61L256A prelim inary t i ming w a v e forms read cy cle 1 (address controlled) t rc t oh t aa t oh address d out read cy cle 2 (chip select controlled) t acs t clz t chz cs d out read cy cle 3 (output enable controlled) t rc t aoe t aa address d out olz t acs t clz t oh t ohz t chz cs oe t -7- www.datasheet www.datasheet www.datasheet www.datasheet 4u 4u4u 4u .com .com .com .com 4 .com u datasheet
s b t SB61L256A prelim inary w r ite cy cle 1 oe clock t wc t wp t cw address d out as t aw cs t t wr t ohz (1,4) t dw t dh we d in oe w r ite cy cle 2 oe = v il fixed t wc t wp t cw address d out as t aw cs t t dw t dh we d in t wr t whz (1,4) t oh t ow (2) (3) not e s : 1. d u ri n g t h i s peri od, i/ o pi n s are i n t h e ou t p u t s t at e, s o i n pu t s i g n a l s of oppos i t e ph as e t o t h e ou t p u t s s h ou l d n o t be applied. 2. t h e dat a ou t p u t f r om d out are th e sam e as th e d a ta w r itten to d in du rin g th e w r ite cy cle. 3. d out prov ides th e read data f o r th e n e x t addres s . 4 . t r an sitio n is m easu r ed 500m v f r om s t eady s t at e w i t h c l = 5pf . t h i s param e t e r i s g u a ran t eed bu t n o t 100% tes t ed. -8- www.datasheet www.datasheet www.datasheet www.datasheet 4u 4u4u 4u .com .com .com .com 4 .com u datasheet
s b t SB61L256A prelim inary www.datasheet www.datasheet www.datasheet www.datasheet 4u 4u4u 4u .com .com .com .com 4 .com u datasheet
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