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low skew, 1-to-8 crystal-to-lvcmos fanout buffer ICS83908I-02 idt ? / ics ? lvcmos fanout buffer 1 ics83908agi-02 rev. b july 24, 2007 preliminary g eneral d escription the ICS83908I-02 is a low skew, high performance 1-to-8 crystal oscillator/3.3v lvcmos-to-3.3v lvcmos fanout buffer and a member of the hipercloc ks? f amily of high performance clock solutions from idt. the ICS83908I-02 has selectable single ended clock or two crystal-oscillator inputs. there is an output enable to disable the outputs by placing them into a high- impedance state. guaranteed output and part-to-part skew characteristics make the ICS83908I-02 ideal for those applications demanding well defined performance and repeatability. f eatures ? eight lvcmos/lvttl outputs (19 typical output impedance) ? two crystal oscillator input pairs one lvcmos/lvttl clock input ? crystal input frequencry range: 10mhz - 40mhz ? output frequency: 200mhz (typical) clk0 ? output skew: tbd ? part to part skew: tbd ? rms phase jitter @ 25mhz (100hz - 1mhz): 0.22ps (typical) v dd = v ddo = 3.3v offset noise p o w er 100hz ............. -111.4 dbc/hz 1khz ............. -139.9 dbc/hz 10khz ......... .... -157.3 dbc/hz 100khz ......... .... -157.5 dbc/hz ? supply voltage modes: (core/output) 3.3v/3.3v 3.3v/2.5v 3.3v/1.8v 2.5v/2.5v 2.5v/1.8v ? -40 c to 85 c ambient operating temperature ? available in both standard (rohs 5) and lead-free (rohs 6) packages hiperclocks? ic s oe clk_sel0 clk_sel1 clk0 q0 q7 osc osc 0 0 0 1 1 0 1 1 pullup ICS83908I-02 24-lead, 173-mil tssop 4.4mm x 7.8mm x 0.92mm body package g package top view v dd xtal_in0 xtal_out0 v ddo q0 q1 gnd q2 q3 v ddo clk_sel0 clk0 gnd xtal_in1 xtal_out1 v ddo q7 q6 gnd q5 q4 v ddo clk_sel1 oe 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 pulldown pulldown xtal_in0 xtal_out0 xtal_in1 xtal_out1 pulldown 8 lvcmos outputs b lock d iagram p in a ssignment the preliminary information presented herein represents a product in pre-production. the noted characteristics are based on ini tial product characterization and/or qualification. integrated device technology, incorporated (idt) reserves the right to change any circuitry or specificat ions without notice.
idt ? / ics ? lvcmos fanout buffer 2 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary t able 1. p in d escriptions t able 2. p in c haracteristics r e b m u ne m a ne p y tn o i t p i r c s e d 1v d d r e w o p. n i p y l p p u s e r o c 3 , 2 , 0 n i _ l a t x 0 t u o _ l a t x t u p n i . t u p n i e h t s i 0 n i _ l a t x . e c a f r e t n i r o t a l l i c s o l a t s y r c . t u p t u o e h t s i 0 t u o _ l a t x 1 2 , 5 1 , 0 1 , 4v o d d r e w o p. s n i p y l p p u s t u p t u o , 8 , 6 , 5 , 7 1 , 6 1 , 9 0 2 , 9 1 , 2 q , 1 q , 0 q , 5 q , 4 q , 3 q 7 q , 6 q t u p t u o . s l e v e l e c a f r e t n i l t t v l / s o m c v l . s t u p t u o k c o l c d e d n e - e l g n i s 4 2 , 8 1 , 7d n gr e w o p. d n u o r g y l p p u s r e w o p , 1 1 4 1 , 0 l e s _ k l c 1 l e s _ k l c t u p n in w o d l l u p . e l b a t n o i t c n u f e c n e r e f e r t u p n i , 3 e l b a t e e s . s t u p n i t c e l e s k c o l c . s l e v e l e c a f r e t n i l t t v l / s o m c v l 2 10 k l ct u p n in w o d l l u p. s l e v e l e c a f r e t n i l t t v l / s o m c v l . t u p n i k c o l c d e d n e - e l g n i s 3 1e ot u p n ip u l l u p . e t a t s e c n a d e p m i h g i h n i e r a s t u p t u o , w o l n e h w . e l b a n e t u p t u o . s l e v e l e c a f r e t n i l t t v l / s o m c v l . e v i t c a e r a s t u p t u o , h g i h n e h w 3 2 , 2 2 , 1 t u o _ l a t x 1 n i _ l a t x t u p n i . t u p n i e h t s i 1 n i _ l a t x . e c a f r e t n i r o t a l l i c s o l a t s y r c . t u p t u o e h t s i 1 t u o _ l a t x : e t o n p u l l u p d n a n w o d l l u p . s e u l a v l a c i p y t r o f , s c i t s i r e t c a r a h c n i p , 2 e l b a t e e s . s r o t s i s e r t u p n i l a n r e t n i o t r e f e r t able 3. i nput r eference f unction t able l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u c n i e c n a t i c a p a c t u p n i 4f p r p u l l u p r o t s i s e r p u l l u p t u p n i 1 5k r n w o d l l u p r o t s i s e r n w o d l l u p t u p n i 1 5k c d p e c n a t i c a p a c n o i t a p i s s i d r e w o p ) t u p t u o r e p ( v o d d v 5 6 4 . 3 =7f p v o d d v 5 2 6 . 2 =7f p v o d d v 2 =6f p r t u o e c n a d e p m i t u p t u o v o d d % 5 v 3 . 3 =9 1 v o d d % 5 v 5 . 2 =1 2 v o d d v 2 . 0 v 8 . 1 =2 3 s t u p n i l o r t n o c e c n e r e f e r 1 l e s _ k l c0 l e s _ k l c 00 ) t l u a f e d ( 0 l a t x 01 1 l a t x 10 0 k l c 11 0 k l c
idt ? / ics ? lvcmos fanout buffer 3 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary a bsolute m aximum r atings supply voltage, v dd 4.6v inputs, v i -0.5v to v dd + 0.5 v outputs, v o -0.5v to v ddo + 0.5v package thermal impedance, ja 84.6c/w (0 mps) storage temperature, t stg -65c to 150c note: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these ratings are stress specifications only. functional op- eration of product at these conditions or any conditions beyond those listed in the dc characteristics or ac characteristics is not implied. exposure to absolute maximum rating conditions for ex- tended periods may affect product reliability. t able 4a. p ower s upply dc c haracteristics , v dd = v ddo = 3.3v5%, t a = -40c to 85c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 5 3 1 . 33 . 35 6 4 . 3v v o d d e g a t l o v y l p p u s t u p t u o 5 3 1 . 33 . 35 6 4 . 3v i d d t n e r r u c y l p p u s r e w o p d e t c e l e s x l a t x & d a o l o n5 2a m d e t c e l e s 0 k l c & d a o l o n0a m i o d d t n e r r u c y l p p u s t u p t u od e t c e l e s 0 k l c & d a o l o n0a m t able 4b. p ower s upply dc c haracteristics , v dd = 3.3v5%, v ddo = 2.5v5%, t a = -40c to 85c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 5 3 1 . 33 . 35 6 4 . 3v v o d d e g a t l o v y l p p u s t u p t u o 5 7 3 . 25 . 25 2 6 . 2v i d d t n e r r u c y l p p u s r e w o p d e t c e l e s x l a t x & d a o l o n5 2a m d e t c e l e s 0 k l c & d a o l o n0a m i o d d t n e r r u c y l p p u s t u p t u od e t c e l e s 0 k l c & d a o l o n0a m t able 4c. p ower s upply dc c haracteristics , v dd = 3.3v5%, v ddo = 1.8v0.2v, t a = -40c to 85c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 5 3 1 . 33 . 35 6 4 . 3v v o d d e g a t l o v y l p p u s t u p t u o 6 . 18 . 10 . 2v i d d t n e r r u c y l p p u s r e w o p d e t c e l e s x l a t x & d a o l o n5 2a m d e t c e l e s 0 k l c & d a o l o n0a m i o d d t n e r r u c y l p p u s t u p t u od e t c e l e s 0 k l c & d a o l o n0a m t able 4d. p ower s upply dc c haracteristics , v dd = v ddo = 2.5v5%, t a = -40c to 85c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 5 7 3 . 25 . 25 2 6 . 2v v o d d e g a t l o v y l p p u s t u p t u o 5 7 3 . 25 . 25 2 6 . 2v i d d t n e r r u c y l p p u s r e w o p d e t c e l e s x l a t x & d a o l o n5 1a m d e t c e l e s 0 k l c & d a o l o n0a m i o d d t n e r r u c y l p p u s t u p t u od e t c e l e s 0 k l c & d a o l o n0a m
idt ? / ics ? lvcmos fanout buffer 4 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary t able 4f. lvcmos/lvttl dc c haracteristics , t a = -40c to 85c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v h i e g a t l o v h g i h t u p n i v d d % 5 v 3 . 3 =2 . 2v d d 3 . 0 +v v d d % 5 v 5 . 2 =6 . 1v d d 3 . 0 +v v l i e g a t l o v w o l t u p n i v d d % 5 v 3 . 3 =3 . 0 -3 . 1v v d d % 5 v 5 . 2 =3 . 0 -9 . 0v i h i t n e r r u c h g i h t u p n i , 0 k l c 1 : 0 l e s _ k l c v d d % 5 v 5 . 2 r o v 3 . 3 =0 5 1a e ov d d % 5 v 5 . 2 r o v 3 . 3 =5a i l i t n e r r u c w o l t u p n i , 0 k l c 1 : 0 l e s _ k l c v d d % 5 v 5 . 2 r o v 3 . 3 =5 -a e ov d d % 5 v 5 . 2 r o v 3 . 3 =0 5 1 -a v h o h g i h t u p t u oe g a t l o v v o d d 1 e t o n ; % 5 v 3 . 3 =6 . 2v v o d d 1 e t o n ; % 5 v 5 . 2 =8 . 1v v o d d 1 e t o n ; v 2 . 0 v 8 . 1 =2 . 1v v l o e g a t l o v w o l t u p t u o v o d d 1 e t o n ; % 5 v 3 . 3 =6 . 0v v o d d 1 e t o n ; % 5 v 5 . 2 =5 . 0v v o d d 1 e t o n ; v 2 . 0 v 8 . 1 =4 . 0v 0 5 h t i w d e t a n i m r e t s t u p t u o : 1 e t o n v o t o d d . s m a r g a i d " t i u c r i c t s e t d a o l " , n o i t c e s t n e m e r u s a e m r e t e m a r a p e e s . 2 / t able 5. c rystal c haracteristics r e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u t u c / n o i t a l l i c s o f o e d o m l a t n e m a d n u f y c n e u q e r f 0 10 4z h m ) r s e ( e c n a t s i s e r s e i r e s t n e l a v i u q e 0 5 e c n a t i c a p a c t n u h s 7f p l e v e l e v i r d 1w m t able 4e. p ower s upply dc c haracteristics , v dd = 2.5v5%, v ddo = 1.8v0.2v, t a = -40c to 85c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 5 7 3 . 25 . 25 2 6 . 2v v o d d e g a t l o v y l p p u s t u p t u o 6 . 18 . 10 . 2v i d d t n e r r u c y l p p u s r e w o p d e t c e l e s x l a t x & d a o l o n5 1a m d e t c e l e s 0 k l c & d a o l o n0a m i o d d t n e r r u c y l p p u s t u p t u od e t c e l e s 0 k l c & d a o l o n0a m
idt ? / ics ? lvcmos fanout buffer 5 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary t able 6a. ac c haracteristics , v dd = v ddo = 3.3v 5%, t a = -40c to 85c t able 6b. ac c haracteristics , v dd = 3.3v 5%, v ddo = 2.5v 5%, t a = -40c to 85c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a n r e t x e / w l a t x 0 10 4z h m k l c l a n r e t x e / w0 0 2z h m p t h l ; h g i h - o t - w o l , y a l e d n o i t a g a p o r p 1 e t o n 2s n t ) o ( k s2 e t o n ; w e k s t u p t u o d b ts p t ) p p ( k s3 , 2 e t o n ; w e k s t r a p - o t - t r a p d b ts p t ) ? ( t i j ; m o d n a r , r e t t i j e s a h p s m r 4 , 2 e t o n ) z h m 1 - z h 0 0 1 ( , z h m 5 22 2 . 0s p t r t / f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 27 5 4s p c d oe l c y c y t u d t u p t u o 0 5% t n e 5 e t o n ; e m i t e l b a n e t u p t u o 0 1s n t s i d 5 e t o n ; e m i t e l b a s i d t u p t u o 8s n v m o r f d e r u s a e m : 1 e t o n d d v o t t u p n i e h t f o 2 / o d d . t u p t u o e h t f o 2 / . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 2 e t o n d n a s e g a t l o v y l p p u s e m a s e h t a g n i t a r e p o s e c i v e d t n e r e f f i d n o s t u p t u o n e e w t e b w e k s s a d e n i f e d : 3 e t o n v t a d e r u s a e m s i t u p t u o e h t , e c i v e d h c a e n o t u p n i f o e p y t e m a s e h t g n i s u . s n o i t i d n o c d a o l l a u q e h t i w o d d . 2 / . d e s u e c r u o s t u p n i e h t n o t n e d n e p e d s i r e t t i j e s a h p : 4 e t o n . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 5 e t o n l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a n r e t x e / w l a t x 0 10 4z h m k l c l a n r e t x e / w0 0 2z h m p t h l ; h g i h - o t - w o l , y a l e d n o i t a g a p o r p 1 e t o n 2 . 2s n t ) o ( k s2 e t o n ; w e k s t u p t u o d b ts p t ) p p ( k s3 , 2 e t o n ; w e k s t r a p - o t - t r a p d b ts p t ) ? ( t i j ; m o d n a r , r e t t i j e s a h p s m r 4 , 2 e t o n ) z h m 1 - z h 0 0 1 ( , z h m 5 21 2 . 0s p t r t / f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 23 6 4s p c d oe l c y c y t u d t u p t u o 0 5% t n e 5 e t o n ; e m i t e l b a n e t u p t u o 0 1s n t s i d 5 e t o n ; e m i t e l b a s i d t u p t u o 8s n v m o r f d e r u s a e m : 1 e t o n d d v o t t u p n i e h t f o 2 / o d d . t u p t u o e h t f o 2 / . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 2 e t o n d n a s e g a t l o v y l p p u s e m a s e h t a g n i t a r e p o s e c i v e d t n e r e f f i d n o s t u p t u o n e e w t e b w e k s s a d e n i f e d : 3 e t o n v t a d e r u s a e m s i t u p t u o e h t , e c i v e d h c a e n o t u p n i f o e p y t e m a s e h t g n i s u . s n o i t i d n o c d a o l l a u q e h t i w o d d . 2 / . d e s u e c r u o s t u p n i e h t n o t n e d n e p e d s i r e t t i j e s a h p : 4 e t o n . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 5 e t o n
idt ? / ics ? lvcmos fanout buffer 6 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary t able 6d. ac c haracteristics , v dd = v ddo = 2.5v 5%, t a = -40c to 85c t able 6c. ac c haracteristics , v dd = 3.3v 5%, v ddo = 1.8v0.2v, t a = -40c to 85c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a n r e t x e / w l a t x 0 10 4z h m k l c l a n r e t x e / w0 0 2z h m p t h l ; h g i h - o t - w o l , y a l e d n o i t a g a p o r p 1 e t o n 5 . 2s n t ) o ( k s2 e t o n ; w e k s t u p t u o d b ts p t ) p p ( k s3 , 2 e t o n ; w e k s t r a p - o t - t r a p d b ts p t ) ? ( t i j ; m o d n a r , r e t t i j e s a h p s m r 4 , 2 e t o n ) z h m 1 - z h 0 0 1 ( , z h m 5 22 2 . 0s p t r t / f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 27 8 4s p c d oe l c y c y t u d t u p t u o 0 5% t n e 5 e t o n ; e m i t e l b a n e t u p t u o 0 1s n t s i d 5 e t o n ; e m i t e l b a s i d t u p t u o 8s n v m o r f d e r u s a e m : 1 e t o n d d v o t t u p n i e h t f o 2 / o d d . t u p t u o e h t f o 2 / . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 2 e t o n d n a s e g a t l o v y l p p u s e m a s e h t a g n i t a r e p o s e c i v e d t n e r e f f i d n o s t u p t u o n e e w t e b w e k s s a d e n i f e d : 3 e t o n v t a d e r u s a e m s i t u p t u o e h t , e c i v e d h c a e n o t u p n i f o e p y t e m a s e h t g n i s u . s n o i t i d n o c d a o l l a u q e h t i w o d d . 2 / . d e s u e c r u o s t u p n i e h t n o t n e d n e p e d s i r e t t i j e s a h p : 4 e t o n . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 5 e t o n l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a n r e t x e / w l a t x 0 10 4z h m k l c l a n r e t x e / w0 0 2z h m p t h l ; h g i h - o t - w o l , y a l e d n o i t a g a p o r p 1 e t o n 3 . 2s n t ) o ( k s2 e t o n ; w e k s t u p t u o d b ts p t ) p p ( k s3 , 2 e t o n ; w e k s t r a p - o t - t r a p d b ts p t ) ? ( t i j ; m o d n a r , r e t t i j e s a h p s m r 4 , 2 e t o n ) z h m 1 - z h 0 0 1 ( , z h m 5 29 2 . 0s p t r t / f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 20 7 4s p c d oe l c y c y t u d t u p t u o 0 5% t n e 5 e t o n ; e m i t e l b a n e t u p t u o 0 1s n t s i d 5 e t o n ; e m i t e l b a s i d t u p t u o 8s n v m o r f d e r u s a e m : 1 e t o n d d v o t t u p n i e h t f o 2 / o d d . t u p t u o e h t f o 2 / . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 2 e t o n d n a s e g a t l o v y l p p u s e m a s e h t a g n i t a r e p o s e c i v e d t n e r e f f i d n o s t u p t u o n e e w t e b w e k s s a d e n i f e d : 3 e t o n v t a d e r u s a e m s i t u p t u o e h t , e c i v e d h c a e n o t u p n i f o e p y t e m a s e h t g n i s u . s n o i t i d n o c d a o l l a u q e h t i w o d d . 2 / . d e s u e c r u o s t u p n i e h t n o t n e d n e p e d s i r e t t i j e s a h p : 4 e t o n . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 5 e t o n
idt ? / ics ? lvcmos fanout buffer 7 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary t able 6e. ac c haracteristics , v dd = 2.5v 5%, v ddo = 1.8v0.2v, t a = -40c to 85c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a n r e t x e / w l a t x 0 10 4z h m k l c l a n r e t x e / w0 0 2z h m p t h l ; h g i h - o t - w o l , y a l e d n o i t a g a p o r p 1 e t o n 6 . 2s n t ) o ( k s2 e t o n ; w e k s t u p t u o d b ts p t ) p p ( k s3 , 2 e t o n ; w e k s t r a p - o t - t r a p d b ts p t ) ? ( t i j ; m o d n a r , r e t t i j e s a h p s m r 4 , 2 e t o n ) z h m 1 - z h 0 0 1 ( , z h m 5 23 . 0s p t r t / f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 28 1 5s p c d oe l c y c y t u d t u p t u o 0 5% t n e 5 e t o n ; e m i t e l b a n e t u p t u o 0 1s n t s i d 5 e t o n ; e m i t e l b a s i d t u p t u o 8s n v m o r f d e r u s a e m : 1 e t o n d d v o t t u p n i e h t f o 2 / o d d . t u p t u o e h t f o 2 / . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 2 e t o n d n a s e g a t l o v y l p p u s e m a s e h t a g n i t a r e p o s e c i v e d t n e r e f f i d n o s t u p t u o n e e w t e b w e k s s a d e n i f e d : 3 e t o n v t a d e r u s a e m s i t u p t u o e h t , e c i v e d h c a e n o t u p n i f o e p y t e m a s e h t g n i s u . s n o i t i d n o c d a o l l a u q e h t i w o d d . 2 / . d e s u e c r u o s t u p n i e h t n o t n e d n e p e d s i r e t t i j e s a h p : 4 e t o n . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 5 e t o n
idt ? / ics ? lvcmos fanout buffer 8 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary 25mhz rms phase jitter (random) 100hz to 1mhz = 0.22ps (typical) o ffset f requency (h z ) n oise p ower dbc hz 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 100 1k 10k 100k 1m ? t ypical p hase n oise at 25mh z @ 3.3v raw phase noise data
idt ? / ics ? lvcmos fanout buffer 9 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary p arameter m easurement i nformation qx qy pa rt 1 pa rt 2 t sk(pp) v ddo 2 v ddo 2 2.5v c ore /2.5v o utput l oad ac t est c ircuit 3.3v c ore /2.5v o utput l oad ac t est c ircuit 3.3v c ore /3.3v o utput l oad ac t est c ircuit scope qx lvcmos gnd 1.65v5% -1.65v5% 3.3v c ore /1.8v o utput l oad ac t est c ircuit 2.5v c ore /1.8v o utput l oad ac t est c ircuit p art - to -p art s kew scope qx lvcmos gnd 2.05v5% -1.25v5% v dd , v ddo v dd scope qx lvcmos gnd 1.25v5% -1.25v5% v dd , v ddo v ddo 1.25v5% scope qx lvcmos gnd 2.4v0.065v v ddo -0.9v0.1v v dd 0.9v0.1v scope qx lvcmos gnd 1.6v0.025v v ddo -0.9v0.1v v dd 0.9v0.1v
idt ? / ics ? lvcmos fanout buffer 10 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary o utput r ise /f all t ime p ropagation d elay o utput d uty c ycle /p ulse w idth /p eriod q0:q7 t period t pw t period odc = v ddo 2 x 100% t pw tp lh tp hl v ddo 2 v dd 2 v ddo 2 v dd 2 clk0 q0:q7 clock outputs 20% 80% 80% 20% t r t f
idt ? / ics ? lvcmos fanout buffer 11 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary a pplication i nformation f igure 1. crystal input interface c rystal i nput i nterface a crystal can be characterized for either series or parallel mode operation. the ICS83908I-02 has a built-in crystal oscillator circuit. this interface can accept either a series or parallel crystal without additional components and generate fre- quencies with accuracy suitable for most applications. additional accuracy can be achieved by adding two small capacitors c1 and c2 as shown in figure 1 . typical results using parallel 18pf crystals are shown in table 5. c1 15p x1 18pf parallel crystal c2 15p xtal_out xtal_in lvcmos to xtal i nterface the xtal_in input can accept a single-ended lvcmos signal through an ac coupling capacitor. a general interface diagram is shown in figure 2. the xtal_out pin can be left floating. the input edge rate can be as slow as 10ns. for lvcmos inputs, it is recommended that the amplitude be reduced from full swing to half swing in order to prevent signal interference with the power rail and to reduce noise. this configuration requires that the output f igure 2. g eneral d iagram for lvcmos d river to xtal i nput i nterface impedance of the driver (ro) plus the series resistance (rs) equals the transmission line impedance. in addition, matched termination at the crystal input will attenuate the signal in half. this can be done in one of two ways. first, r1 and r2 in parallel should equal the transmission line impedance. for most 50 applications, r1 and r2 can be 100 . this can also be accomplished by removing r1 and making r2 50 . r2 zo = 50 vdd ro zo = ro + rs r1 vdd xta l _ i n xta l _ o u t .1uf rs
idt ? / ics ? lvcmos fanout buffer 12 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary i nputs : clk i nput for applications not requiring the use of the test clock, it can be left floating. though not required, but for additional protection, a 1k resistor can be tied from the clk input to ground. c rystal i nputs for applications not requiring the use of the crystal oscillator input, both xtal_in and xtal_out can be left floating. though not required, but for additional protection, a 1k resister can be tied from xtal_in to ground. lvcmos c ontrol p ins all control pins have internal pull-ups or pull-downs; additional resistance is not required but can be added for additional protection. a 1k resistor can be used. r ecommendations for u nused i nput and o utput p ins o utputs : lvcmos o utputs all unused lvcmos output can be left floating. there should be no trace attached.
idt ? / ics ? lvcmos fanout buffer 13 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary r eliability i nformation t ransistor c ount the transistor count for ICS83908I-02 is: 277 t able 7. ja vs . a ir f low t able for 24 l ead tssop ja by velocity (meters per second) 0 1 2.5 multi-layer pcb, jedec standard test boards 84.6c/w 80.3c/w 78.1c/w
idt ? / ics ? lvcmos fanout buffer 14 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary p ackage o utline - g s uffix for 24 l ead tssop t able 8. p ackage d imensions r eference d ocument : jedec p ublication 95, mo-153 l o b m y s s r e t e m i l l i m m u m i n i mm u m i x a m n4 2 a- -0 2 . 1 1 a5 0 . 05 1 . 0 2 a0 8 . 05 0 . 1 b9 1 . 00 3 . 0 c9 0 . 00 2 . 0 d0 7 . 70 9 . 7 ec i s a b 0 4 . 6 1 e0 3 . 40 5 . 4 ec i s a b 5 6 . 0 l5 4 . 05 7 . 0 0 8 a a a- -0 1 . 0
idt ? / ics ? lvcmos fanout buffer 15 ics83908agi-02 rev. b july 24, 2007 ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary while the information presented herein has been checked for both accuracy and reliability, integrated device technology, incorp orated (idt) assumes no responsibility for either its use or for infringement of any patents or other rights of third parties, which would result from its use. no other circuits, patents, or l icenses are implied. this product is intended for use in normal commercial and industrial applications. any other applications such as those requiring high reliability or other extraordinary environmental r equirements are not recommended without additional processing by idt. idt reserves the right to change any circuitry or specifications without notice. idt does not authorize or warrant any idt product for use in life support devices or critical medical instruments. t able 9. o rdering i nformation r e b m u n r e d r o / t r a pg n i k r a me g a k c a pg n i g a k c a p g n i p p i h se r u t a r e p m e t 2 0 - i g a 8 0 9 3 8 s c id b tp o s s t d a e l 4 2e b u tc 5 8 o t c 0 4 - t 2 0 - i g a 8 0 9 3 8 s c id b tp o s s t d a e l 4 2l e e r & e p a t 0 0 5 2c 5 8 o t c 0 4 - f l 2 0 - i g a 8 0 9 3 8 s c il 2 0 i a 8 0 9 3 8 s c ip o s s t " e e r f - d a e l " d a e l 4 2e b u tc 5 8 o t c 0 4 - t f l 2 0 - i g a 8 0 9 3 8 s c il 2 0 i a 8 0 9 3 8 s c ip o s s t " e e r f - d a e l " d a e l 4 2l e e r & e p a t 0 0 5 2c 5 8 o t c 0 4 - . t n a i l p m o c s h o r e r a d n a n o i t a r u g i f n o c e e r f - b p e h t e r a r e b m u n t r a p e h t o t x i f f u s " f l " n a h t i w d e r e d r o e r a t a h t s t r a p : e t o n
innovate with idt and accelerate your future networks. contact: www.idt.com for sales 800-345-7015 408-284-8200 fax: 408-284-2775 for tech support netcom@idt.com 480-763-2056 corporate headquarters integrated device t echnology, inc. 6024 silver creek valley road san jose, ca 95138 united states 800 345 7015 +408 284 8200 (outside u.s.) asia pacific and japan integrated device technology singapore (1997) pte. ltd. reg. no. 199707558g 435 orchard road #20-03 wisma atria singapore 238877 +65 6 887 5505 europe idt europe, limited 321 kingston road leatherhead, surrey kt22 7tu england +44 (0) 1372 363 339 fax: +44 (0) 1372 378851 ? 2007 integrated device technology, inc. all rights reserved. product specifications subject to change without notice. idt, th e idt logo, ics and hiperclocks are trademarks of integrated device technology, inc. accelerated thinking is a service mark of integrated device technology, inc. all other br ands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. printed in usa ICS83908I-02 low skew, 1-to-8 cryst al-to-lvcmos f anout buffer preliminary

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