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8523 www.icst.com rev. c february 9, 2001 1 preliminary

ics8523 l ow s kew , 1- to -4 lvhstl f anout b uffer g eneral d escription the ics8523 is a low skew, high performance, 1-to-4 lvhstl clock fanout buffer and a member of the hiperclocks? family of high performance clock solutions from ics. the ics8523 has selectable clock inputs that accept either hstl or pecl input levels. the clock enable is synchronous which eliminates the runt clock pulses which occur during asynchro- nous enabling and disabling of the outputs. guaranteed output and part-to-part skew characteristics make the ics8523 ideal for those applications demanding well defined performance and repeatability. f eatures ? 4 lvhstl outputs each with the ability to drive 50 ? to ground ? selectable differential hstl or pecl clock inputs ? voh (max) = 1.2v ? input crossover voltage, vx, 0.68v vx 0.9v ? output frequency up to 500mhz ? 30ps output skew ? 3.3v input, 1.8v output operating supply voltages ? lvcmos / lvttl control inputs ? 20 lead tssop ? 0c to 70c ambient operating temperature ? industrial temperature version available upon request b lock d iagram p in a ssignment the preliminary information presented herein represents a product in prototyping or pre-production. the noted characteristics a re based on initial product characterization. integrated circuit systems, incorporated (ics) reserves the right to change any circuitry or specifications without notice. ics8523 20-lead tssop g package top view vee clk_en clk_sel hclk nhclk pclk npclk nc nc vddi 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 q0 nq0 vddo q1 nq1 q2 nq2 vddo q3 nq3 hclk nhclk pclk npclk q0 nq0 q1 nq1 q2 nq2 q3 nq3 0 1 clk_en clk_sel nd q le hiperclocks?
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ics8523 l ow s kew , 1- to -4 lvhstl f anout b uffer t able 2. p in c haracteristics 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 n i c t u p n i e c n a t i c a p a c k l c h n , k l c h f p k l c p n , k l c p f p , n e _ k l c l e s _ k l c f p p u l l u p rr o t s i s e r p u l l u p t u p n i 1 5k ? n w o d l l u p rr o t s i s e r n w o d l l u p t u p n i 1 5k ? t able 1. p in d escriptions r e b m u ne m a ne p y tn o i t p i r c s e d 1e e vr e w o p . d n u o r g y l p p u s r e w o p o t t c e n n o c . n i p y l p p u s r e w o p e v i t a g e n 2n e _ k l ct u p n ip u l l u p . t u p n i k c o l c s w o l l o f s t u p t u o k c o l c h g i h n e h w . e l b a n e k c o l c s u o n o r h c n y s . h g i h e c r o f e r a s t u p t u o q n , w o l e c r o f e r a s t u p t u o q , w o l n e h w . 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 3l e s _ k l ct u p n in w o d l l u p . s t u p n i l t s h l a i t n e r e f f i d s t c e l e s h g i h n e h w . 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 . s t u p n i l c e p l a i t n e r e f f i d s t c e l e s w o l n e h w 4k l c ht u p n in w o d l l u p. t u p n i k c o l c l t s h l a i t n e r e f f i d g n i t r e v n i - n o n 5k l c h nt u p n ip u l l u p. t u p n i k c o l c l t s h l a i t n e r e f f i d g n i t r e v n i 6k l c pt u p n in w o d l l u p. t u p n i k c o l c l c e p l a i t n e r e f f i d g n i t r e v n i - n o n 7k l c p nt u p n ip u l l u p. t u p n i k c o l c l c e p l a i t n e r e f f i d g n i t r e v n i 9 , 8c nd e s u n u. s n i p d e s u n u 0 1i d d vr e w o p. v 3 . 3 o t t c e n n o c . n i p y l p p u s r e w o p t u p n i 2 1 , 1 13 q , 3 q nt u p t u o. s l e v e l e c a f r e t n i l t s h v l . s t u p t u o k c o l c l a i t n e r e f f i d 8 1 , 3 1o d d vr e w o p. v 8 . 1 o t t c e n n o c . y l p p u s r e w o p t u p t u o 5 1 , 4 12 q , 2 q nt u p t u o. s l e v e l e c a f r e t n i l t s h v l . s t u p t u o k c o l c l a i t n e r e f f i d 7 1 , 6 11 q , 1 q nt u p t u o. s l e v e l e c a f r e t n i l t s h v l . s t u p t u o k c o l c l a i t n e r e f f i d 0 2 , 9 10 q , 0 q nt u p t u o. s l e v e l e c a f r e t n i l t s h v l . s t u p t u o k c o l c l a i t n e r e f f i d
8523 www.icst.com rev. c february 9, 2001 3 preliminary

ics8523 l ow s kew , 1- to -4 lvhstl f anout b uffer t able 3a. c ontrol i nputs f unction t able s t u p n is t u p t u o n e _ k l cl e s _ k l c3 q u r h t 0 q3 q n u r h t 0 q n 00 w o lh g i h 01 w o lh g i h 10 e v i t c ae v i t c a 11 e v i t c ae v i t c a d e b i r c s e d s a s t u p n i k l c p n , k l c p d n a k l c h n , k l c h e h t f o n o i t c n u f a s i t u p t u o e h t f o e t a t s e h t e d o m e v i t c a e h t n i . b 3 e l b a t n i t able 3b. c lock i nputs f unction t able s t u p n is t u p t u o e d o m t u p t u o o t t u p n iy t i r a l o p k l c p r o k l c h r o k l c h n k l c p n 3 q u r h t 0 q3 q n u r h t 0 q n 00w o lh g i hl a i t n e r e f f i d o t l a i t n e r e f f i dg n i t r e v n i n o n 11 h g i hw o ll a i t n e r e f f i d o t l a i t n e r e f f i dg n i t r e v n i n o n 01 e t o n ; d e s a i bw o lh g i hl a i t n e r e f f i d o t d e d n e e l g n i sg n i t r e v n i n o n 11 e t o n ; d e s a i bh g i hw o ll a i t n e r e f f i d o t d e d n e e l g n i sg n i t r e v n i n o n 1 e t o n ; d e s a i b0h g i hw o ll a i t n e r e f f i d o t d e d n e e l g n i sg n i t r e v n i 1 e t o n ; d e s a i b1w o lh g i hl a i t n e r e f f i d o t d e d n e e l g n i sg n i t r e v n i e h t s t e s t u p n i d e s a i b e h t t a e g a t l o v e h t . d e s a i b e b t u p n i l a i t n e r e f f i d e h t f o e n o t a h t s e r i u q e r e s u d e d n e e l g n i s : 1 e t o n k 0 1 a s i k r o w t e n s a i b t u p n i d e d n e m m o c e r e h t s l e v e l l t t v l d n a s o m c v l r o f . t u p n i d e d n e e l g n i s e h t r o f t n i o p h c t i w s ? k 0 1 , d d v o t n i p t u p n i e h t m o r f r o t s i s e r ? o t t u p n i e h t m o r f r o t i c a p a c f 1 . 0 a d n a d n u o r g o t n i p t u p n i e h t m o r f r o t s i s e r . v m 0 0 3 2 / d d v s i t n i o p h c t i w s g n i t l u s e r e h t . d n u o r g
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ics8523 l ow s kew , 1- to -4 lvhstl f anout b uffer a bsolute m aximum r atings supply voltage 4.6v inputs -0.5v to vddi + 0.5v outputs -0.5v to vddo + 0.5v ambient operating temperature 0 c to 70 c storage temperature -65 c to 150 c stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these ratings are stress specifications only and functional operation of product at these condition or any conditions beyond those listed in the dc characteristics or ac characteristics is not implied. exposure to absolute maximum rating conditions for extended periods may affect product reliability. t able 4a. p ower s upply dc c haracteristics , vddi = 3.3v5%, vddo = 1.8v10%, t a =0 c to 70 c t able 4b. lvcmos / lvttl dc c haracteristics , vddi = 3.3v5%, vddo = 1.8v10%, t a =0 c to 70 c t able 4c. lvpecl dc c haracteristics , vddi = 3.3v5%, vddo = 1.8v10%, t a =0 c to 70 c 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 h i ve g a t l o v h g i h t u p n il e s _ k l c , n e _ k l c25 6 7 . 3v l i ve g a t l o v w o l t u p n il e s _ k l c , n e _ k l c3 . 0 -8 . 0v h i it n e r r u c h g i h t u p n i n e _ k l c 5a l e s _ k l c 0 5 1a l i it n e r r u c w o l t u p n i n e _ k l c0 5 1 -a l e s _ k l c5 -a 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 i d d ve g a t l o v y l p p u s r e w o p t u p n i5 3 1 . 33 . 35 6 4 . 3v o d d ve g a t l o v y l p p u s r e w o p t u t p u o6 . 18 . 10 . 2v e e it n e r r u c y l p p u s r e w o p 0 5a m 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 h i it n e r r u c h g i h t u p n i k l c p 0 5 1a k l c p n 5a l i it n e r r u c w o l t u p n i k l c p5 -a k l c p n0 5 1 -a p p ve g a t l o v t u p n i k a e p - o t - k a e p 1 . 03 . 1v r m c v1 e t o n ; e g a t l o v t u p n i e d o m n o m m o c 3 1 . 03 . 1v l c e p v l , s d v l , m c d h t i w e l b i t a p m o c s i r m c v . h i v m u m i n i m e h t s a d e n i f e d s i l c e p r o f e g a t l o v e d o m n o m m o c : 1 e t o n . s l e v e l t u p n i l t s s d n a
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ics8523 l ow s kew , 1- to -4 lvhstl f anout b uffer t able 5. e lectrical ac c haracteristics , vcc=3.3v5%, vcco=1.8v10%, t a =0 c to 70 c t able 4d. lvhstl dc c haracteristics , vddi = 3.3v5%, vddo = 1.8v10%, t a =0 c to 70 c 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 h i it n e r r u c h g i h t u p n i k l c h 0 5 1a k l c h n 5a l i it n e r r u c w o l t u p n i k l c h5 -a k l c h n0 5 1 -a p p ve g a t l o v t u p n i k a e p - o t - k a e p 1 . 03 . 1v r m c v2 , 1 e t o n ; e g a t l o v t u p n i e d o m n o m m o c 3 1 . 03 . 1v h o v3 e t o n ; e g a t l o v h g i h t u p t u o 0 . 12 . 1v l o v3 e t o n ; e g a t l o v w o l t u p t u o 04 . 0v x o ve g a t l o v r e v o s s o r c t u p t u o x % 0 4 ) l o v - h o v ( l o v + x % 0 6 ) l o v - h o v ( l o v + v , m c d h t i w e l b i t a p m o c s i r m c v . e g a t l o v r e v o s s o r c e h t s a d e n i f e d s i l t s h r o f e g a t l o v e d o m n o m m o c : 1 e t o n . s l e v e l t u p n i l t s s d n a l c e p v l , s d v l . v 3 . 0 + d d v s i k l c h n d n a k l c h r o f e g a t l o v t u p n i m u m i x a m e h t s n o i t a c i l p p a d e d n e e l g n i s r o f : 2 e t o n 0 5 h t i w d e t a n i m r e t s t u p t u o : 3 e t o n ? . w m 2 3 s i r i a p t u p t u o d e t a n i m r e t a f o n o i t a p i s s i d r e w o p e h t . d n u o r g o t 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 x a m fy c n e u q e r f t u p n i m u m i x a m 0 5 6z h m h l p t2 e t o n ; h g i h - o t - w o l , y a l e d n o i t a g a p o r p0 . 10 . 2s n l h p t2 e t o n ; w o l - o t - h g i h , y a l e d n o i t a g a p o r p0 . 10 . 2s n ) o ( k s t3 e t o n ; w e k s t u p t u o 0 3s p ) p p ( k s t4 e t o n ; t r a p - o t - t r a p 0 5 1s p ) ? ( t i j t5 e t o n ; r e t t i j t u p t u o - o t - t u p n i 0s p r te m i t e s i r t u p t u o% 0 7 o t % 0 30 0 10 0 8s p f te m i t l l a f t u p t u o% 0 7 o t % 0 30 0 10 0 8s p w p th t d i w e s l u p t u p t u o 2 / e l c y c t d b t - 2 / e l c y c t 2 / e l c y c t d b t + s n s te m i t p u t e s e l b a n e k c o l c0 . 1s n h te m i t d l o h e l b a n e k c o l c0 . 1s n . e s i w r e h t o d e t o n s s e l n u z h m 0 0 5 t a d e r u s a e m s r e t e m a r a p l l a : 1 e t o n . t n i o p g n i s s o r c t u p t u o l a i t n e r e f f i d e h t o t t n i o p % 0 5 e h t m o r f d e r u s a e m : 2 e t o n . s n o i t i d n o c d a o l l a u q e h t i w d n a e g a t l o v y l p p u s e m a s e h t t a 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 . t n i o p g n i s s o r c t u p t u o l a i t n e r e f f i d e h t o t t u p n i e h t f o t n i o p % 0 5 e h t m o r f d e r u s a e m s e g a t l o v y l p p u s e m a s e h t 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 : 4 e t o n . t n i o p g n i s s o r c t u p t u o l a i t n e r e f f i d e h t o t s t u p n i e k i l f o t n i o p % 0 5 e h t m o r f d e r u s a e m . s n o i t i d n o c d a o l l a u q e h t i w d n a . s e l c y c t u p t u o n e e w t e b t n e m e c a l p s i d t s e g r a l e h t g n i r u s a e m d n a l a n g i s t u p n i n o g n i r e g g i r t y b d e r u s a e m : 5 e t o n
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ics8523 l ow s kew , 1- to -4 lvhstl f anout b uffer e 20 11 1 10 a a1 b a2 c l d e1 e -c- d aaa c seating plane p ackage o utline - g s uffix l o b m y ss r e t e m i l l i ms e h c n i n i mx a mn i mx a m n0 2 a- -0 2 . 1- -7 4 0 . 1 a5 0 . 05 1 . 02 0 0 .6 0 0 . 2 a0 8 . 05 0 . 12 3 0 .1 4 0 . b9 1 . 00 3 . 07 0 0 .2 1 0 . c9 0 . 00 2 . 05 3 0 0 .8 0 0 . d0 4 . 60 6 . 62 5 2 .0 6 2 . ec i s a b 0 4 . 6c i s a b 2 5 2 . 0 1 e0 3 . 40 5 . 49 6 1 .7 7 1 . ec i s a b 5 6 . 0c i s a b 6 5 2 0 . l5 4 . 05 7 . 08 1 0 .0 3 0 . a 0 8 0 8 a a a- -0 1 . 0- -4 0 0 . 10 11 t able 6. p ackage d imensions reference document: jedec publication 95, mo-153
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ics8523 l ow s kew , 1- to -4 lvhstl f anout b uffer t able 7. o rdering i nformation while the information presented herein has been checked for both accuracy and reliability, integrated circuit systems, incorpor ated (ics) 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 licenses are i mplied. this product is intended for use in normal commercial applications. any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environment al requirements are not recommended without additional processing by ics. ics reserves the right to change any circuitry or specifications without notice. ics does not authorize or warrant any ics product for use in life support devices or critical medical instruments. 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 pt n u o ce r u t a r e p m e t g a 3 2 5 8 s c ig a 3 2 5 8 s c ip o s s t d a e l 0 25 7c 0 7 o t c 0 t g a 3 2 5 8 s c ig a 3 2 5 8 s c il e e r d n a e p a t n o p o s s t d a e l 0 20 0 5 2c 0 7 o t c 0

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