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8531ay-01 www.icst.com/products/hiperclocks.html rev. b august 9, 2001 1

ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer g eneral d escription the ics8531-01 is a low skew, high performance 1-to-9 differential-to-3.3v lvpecl fanout buffer and a member of the hiperclocks? family of high performance clock solutions from ics. the ics8531-01 has two selectable clock inputs. the clk, nclk pair can accept most standard differential input levels. the pclk, npclk pair can accept lvpecl, cml, or sstl input levels. the clock enable is internally synchronized to eliminate runt pulses on the out- puts during asynchronous assertion/deassertion of the clock enable pin. guaranteed output skew and part-to-part skew characteris- tics make the ics8531-01 ideal for high performance work- station and server applications. hiperclocks? ,&6 f eatures ? 9 differential 3.3v lvpecl outputs ? selectable clk, nclk or lvpecl clock inputs ? clk, nclk pair can accept the following differential input levels: lvds, lvpecl, lvhstl, sstl, hcsl ? pclk, npclk supports the following input types: lvpecl, cml, sstl ? maximum output frequency up to 500mhz ? translates any single ended input signal (lvcmos, lvttl, gtl) to 3.3v lvpecl levels with resistor bias on nclk input ? output skew: 50ps (maximum) ? part-to-part skew: 250ps (maximum) ? propagation delay: 2ns (maximum) ? 3.3v operating supply ? 0 c to 70 c ambient operating temperature ? industrial temperature information available upon request b lock d iagram p in a ssignment 32 31 30 29 28 27 26 25 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 v cco q3 nq3 q4 nq4 q5 nq5 v cco ics8531-01 vcco q6 nq6 q7 nq7 q8 nq8 vcco v cco nq2 q2 nq1 q1 nq0 q0 v cco v cc clk nclk clk_sel pclk npclk v ee clk_en 32-lead lqfp 7mm x 7mm x 1.4mm package body y package to p vi e w clk nclk pclk npclk q0 nq0 q1 nq1 q2 nq2 q3 nq3 q4 nq4 q5 nq5 q6 nq6 q7 nq7 q8 nq8 d q le clk_en clk_sel 0 1
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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer 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 c c r 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 e v i t i s o p 2k l ct u p n in w o d l l u p. t u p n i k c o l c l a i t n e r e f f i d g n i t r e v n i - n o n 3k l c nt u p n ip u l l u p. t u p n i k c o l c l a i t n e r e f f i d g n i t r e v n i 4l e s _ k l ct u p n in w o d l l u p . s t u p n i k l c p n , k l c p 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 t c e l e s , w o l n e h w. k l c n , k l c . s l e v e l e c a f r e t n i s o m c v l / l t t v l 5k 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 v l l a i t n e r e f f i d g n i t r e v n i - n o n 6k 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 v l l a i t n e r e f f i d g n i t r e v n i 7v e e r e w o p. d n u o r g o t t c e n n o c . n i p y l p p u s e v i t a g e n 8n e _ k l ct u p n ip u l l u p 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 g n i z i n o r h c n y s s t u p t u o q n , w o l d e c r o f e r a s t u p t u o q , w o l n e h w . t u p n i k c o l c . s l e v e l e c a f r e t n i s o m c v l / l t t v l . h g i h d e c r o f e r a , 7 1 , 6 1 , 9 2 3 , 5 2 , 4 2 v o c c r e w o p. v 3 . 3 o t t c e n n o c . s n i p y l p p u s t u p t u o 1 1 , 0 18 q , 8 q nt u p t u o. l e v e l e c a f r e t n i l c e p v l . r i a p t u p t u o l a i t n e r e f f i d 3 1 , 2 17 q , 7 q nt u p t u o. l e v e l e c a f r e t n i l c e p v l . r i a p t u p t u o l a i t n e r e f f i d 5 1 , 4 16 q , 6 q nt u p t u o. l e v e l e c a f r e t n i l c e p v l . r i a p t u p t u o l a i t n e r e f f i d 9 1 , 8 15 q , 5 q nt u p t u o. l e v e l e c a f r e t n i l c e p v l . r i a p t u p t u o l a i t n e r e f f i d 1 2 , 0 24 q , 4 q nt u p t u o. l e v e l e c a f r e t n i l c e p v l . r i a p t u p t u o l a i t n e r e f f i d 3 2 , 2 23 q 3 q nt u p t u o. l e v e l e c a f r e t n i l c e p v l . r i a p t u p t u o l a i t n e r e f f i d 7 2 , 6 22 q , 2 q nt u p t u o. l e v e l e c a f r e t n i l c e p v l . r i a p t u p t u o l a i t n e r e f f i d 9 2 , 8 21 q , 1 q nt u p t u o. l e v e l e c a f r e t n i l c e p v l . r i a p t u p t u o l a i t n e r e f f i d 1 3 , 0 30 q , 0 q nt u p t u o. l e v e l e c a f r e t n i l c e p v l . r i a p t u p t u o l a i t n e r e f f i d : 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 s r e f e r 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 , k l c n , k l c k c l p n , k l c p 4f p l e s _ k l c , n e _ k l c4f 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 ?
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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer t able 3a. c ontrol i nput 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 cd e c r u o s d e t c e l e s8 q u r h t 0 q8 q n u r h t 0 q n 00 k l c n , k l cw o l ; d e l b a s i dh g i h ; d e l b a s i d 01 k l c p n , k l c pw o l ; d e l b a s i dh g i h ; d e l b a s i d 10 k l c n , k l cd e l b a n ed e l b a n e 11 k l c p n , k l c pd e l b a n ed e l b a n e e g d e k c o l c t u p n i g n i l l a f d n a g n i s i r a g n i w o l l o f d e l b a n e r o d e l b a s i d e r a s t u p t u o k c o l c e h t , s e h c t i w s n e _ k l c r e t f a . 1 e r u g i f n i n w o h s s 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 n , k l c e h t f o n o i t c n u f a e r a s 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 ck l c p n r o k l c n8 q u r h t 0 q8 q n u r h t 0 q n 01w 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 10 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 l a i t n e r e f f i d e h t g n i r i w s e s s u c s i d h c i h w , 9 e r u g i f , 8 e g a p n o n o i t c e s n o i t a m r o f n i n o i t a c i l p p a e h t o t r e f e r e s a e l p : 1 e t o n . s l e v e l d e d n e e l g n i s t p e c c a o t t u p n i f igure 1: clk_en t iming d iagram enabled disabled nclk, npclk clk, pclk clk_en nq0 - nq8 q0 - q8
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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer a bsolute m aximum r atings supply voltage, v ccx 4.6v inputs, v i -0.5v to v cc + 0.5v outputs, v o -0.5v to v cco + 0.5v package thermal impedance, ja 47.9 c/w storage temperature, t stg -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. functional operation of product at these conditions or any conditions beyond those listed in th e dc characteristics or ac characteristics is not implied. exposure to absolute maximum rating conditions for extended peri- ods may affect product reliability. t able 4a. p ower s upply dc c haracteristics , v cc = v cco = 3.3v5%, t a = 0 c to 70 c t able 4b. lvcmos dc c haracteristics , v cc = v cco = 3.3v5%, t a = 0 c to 70 c t able 4c. d ifferential dc c haracteristics , v cc = v cco = 3.3v5%, 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 v c c e g a t l o v y l p p u s e v i t i s o p 5 3 1 . 33 . 35 6 4 . 3v v o c c 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 e e t n e r r u c y l p p u s r e w o p 0 50 7a 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 v h i l e s _ k l c , n e _ k l c25 6 7 . 3v v l i l e s _ k l c , n e _ k l c3 . 0 -8 . 0v i h i t n e r r u c h g i h t u p n i n e _ k l cv c c v = n i v 5 6 4 . 3 =5a l e s _ k l cv c c v = n i v 5 6 4 . 3 =0 5 1a i l i t n e r r u c w o l t u p n i n e _ k l cv n i v , v 0 = c c v 5 6 4 . 3 =0 5 1 -a l e s _ k l cv n i v , v 0 = c c v 5 6 4 . 3 =5 -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 h i t n e r r u c h g i h t u p n i k l cv c c v = n i v 5 6 4 . 3 =0 5 1a k l c nv c c v = n i v 5 6 4 . 3 =5a i l i t n e r r u c w o l t u p n i k l cv n i v , v 0 = c c v 5 6 4 . 3 =5 -a k l c nv n i v , v 0 = c c v 5 6 4 . 3 =0 5 1 -a v p p e g a t l o v t u p n i k a e p - o t - k a e p5 1 . 03 . 1v v r m c ; e g a t l o v t u p n i e d o m n o m m o c 2 , 1 e t o n v e e 5 . 0 +v c c 5 8 . 0 -v v s i k l c n d n a k l c 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 : 1 e t o n c c . v 3 . 0 + v s a d e n i f e d s i e g a t l o v t u p n i e d o m n o m m o c : 2 e t o n h i .
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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer t able 4d. lvpecl dc c haracteristics , v cc = v cco = 3.3v5%, 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 i h i t n e r r u c h g i h t u p n i k l c pv c c v = n i v 5 6 4 . 3 =0 5 1a k l c p nv c c v = n i v 5 6 4 . 3 =5a i l i t n e r r u c w o l t u p n i k l c pv n i v , v 0 = c c v 5 6 4 . 3 =5 -a k l c p nv n i v , v 0 = c c v 5 6 4 . 3 =0 5 1 -a v p p e g a t l o v t u p n i k a e p - o t - k a e p 3 . 01v v r m c ; e g a t l o v t u p n i e d o m n o m m o c 2 , 1 e t o n v e e 5 . 1 +v c c v v h o 3 e t o n ; e g a t l o v h g i h t u p t u ov o c c 4 . 1 -v o c c 0 . 1 -v v l o 3 e t o n ; e g a t l o v w o l t u p t u ov o c c 0 . 2 -v o c c 7 . 1 -v v g n i w s g n i w s e g a t l o v t u p t u o k a e p - o t - k a e p 6 . 05 8 . 0v v s a d e n i f e d s i e g a t l o v t u p n i e d o m n o m m o c : 1 e t o n h i . v s i k l c p n d n a k l c p 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 c c . v 3 . 0 + 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 ? v o t o c c . v 2 - t able 5. ac c haracteristics , v cc = v cco = 3.3v5%, 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 f x a m y c n e u q e r f t u p t u o m u m i x a m 0 0 5z h m t d p 1 e t o n ; y a l e d n o i t a g a p o r p ? z h m 0 5 21 2s n t ) o ( k s4 , 2 e t o n ; w e k s t u p t u o 0 5s p t ) p p ( k s4 , 3 e t o n ; w e k s t r a p - o t - t r a p 0 5 2s p t r e m i t e s i r t u p t u oz h m 0 5 @ % 0 8 o t % 0 20 0 30 0 7s p t f e m i t l l a f t u p t u oz h m 0 5 @ % 0 8 o t % 0 20 0 30 0 7s p c d oe l c y c y t u d t u p t u o 8 40 52 5% . e s i w r e h t o d e t o n s s e l n u z h m 0 5 2 t a d e r u s a e m s r e t e m a r a p l l a . 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 g n i s s o r c t u p n i l a i t n e r e f f i d e h t m o r f d e r u s a e m : 1 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 : 2 e t o n . s t n i o p s s o r c l a i t n e r e f f i d t u p t u o e h t t a 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 : 3 e t o n d e r u s a e m e r a s t u p t u o e h t , e c i v e d h c a e n o s 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 d n a . s t n i o p s s o r c l a i t n e r e f f i d e h t t a . 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 : 4 e t o n
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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer p arameter m easurement i nformation f igure 2 - o utput l oad t est c ircuit scope qx nqx lvpecl v cc = 2.0v v cco = 2.0v v cc v cco v ee = -1.3v 0.135v f igure 3 - d ifferential i nput l evel v cmr cross points v pp clk, pclk nclk, npclk v ee v cc f igure 4 - o utput s kew t sk(o) qx nqx qy nqy
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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer f igure 5 - p art - to -p art s kew qx nqx qy nqy part 1 part 2 t sk(pp) f igure 6 - i nput and o utput r ise and f all t ime clock inputs and outputs 20% 80% 20% 80% t r t f v swing f igure 7 - p ropagation d elay t pd clk, pclk nclk, npclk q0 - q8 nq0 - nq8 f igure 8 - odc & t p eriod pulse width t period t pw t period odc = clk, pclk, qx nclk, npclk, nqx
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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer a pplication i nformation w iring the d ifferential i nput to a ccept s ingle e nded l evels figure 9 shows how the differential input can be wired to accept single ended levels. the reference voltage v_ref ~ v cc /2 is generated by the bias resistors r1, r2 and c1. this bias circuit should be located as close as possible to the input pin. the r atio of r1 and r2 might need to be adjusted to position the v_ref in the center of the input voltage swing. for example, if the input c lock swing is only 2.5v and v cc = 3.3v, v_ref should be 1.25v and r2/r1 = 0.609. r2 1k v cc clk_in + - r1 1k c1 0.1uf v_ref r2 1k v cc clk_in + - r1 1k c1 0.1uf v_ref f igure 9: s ingle e nded s ignal d riving d ifferential i nput
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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer p ower c onsiderations this section provides information on power dissipation and junction temperature for the ics8531-01. equations and example calculations are also provided. 1. power dissipation. the total power dissipation for the ics8531-01 is the sum of the core power plus the power dissipated in the load(s). the following is the power dissipation for v cc = 3.3v + 5% = 3.465v, which gives worst case results. note: please refer to section 3 for details on calculating power dissipated in the load. ? power (core) max = v cc_max * i ee_max = 3.465v * 70ma = 242.6mw ? power (outputs) max = 30.2mw/loaded output pair if all outputs are loaded, the total power is 9 * 30.2mw = 271.8mw total power _max (3.465v, with all outputs switching) = 242.6mw + 271.8mw = 514.4mw 2. junction temperature. junction temperature, tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the device. the maximum recommended junction temperature for hiperclocks tm devices is 125 c. the equation for tj is as follows: tj = ja * pd_total + t a tj = junction temperature ja = junction-to-ambient thermal resistance pd_total = total device power dissipation (example calculation is in section 1 above) t a = ambient temperature in order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance ja must be used . assuming a moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 42.1 c/w per table 6 below. therefore, tj for an ambient temperature of 70 c with all outputs switching is: 70 c + 0.514w * 42.1 c/w = 91.6 c. this is well below the limit of 125 c this calculation is only an example. tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow , and the type of board (single layer or multi-layer). ja by velocity (linear feet per minute) 0 200 500 single-layer pcb, jedec standard test boards 67.8 c/w 55.9 c/w 50.1 c/w multi-layer pcb, jedec standard test boards 47.9 c/w 42.1 c/w 39.4 c/w note: most modern pcb designs use multi-layered boards. the data in the second row pertains to most designs. table 6. thermal resistance ja for 32-pin lqfp forced convection
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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer 3. calculations and equations. the purpose of this section is to derive the power dissipated into the load. lvpecl output driver circuit and termination are shown in figure 10. t o calculate worst case power dissipation into the load, use the following equations which assume a 50 ? load, and a termination voltage of v cc - 2v. pd_h is power dissipation when the output drives high. pd_l is the power dissipation when the output drives low. pd_h = [(v oh_max ? (v cc_max - 2v))/r l ] * (v cc_max - v oh_max ) pd_l = [(v ol_max ? (v cc_max - 2v))/r l ] * (v cc_max - v ol_max ) for logic high, v out = v oh_max = v cc_max ? 1.0v using v cc_max = 3.465, this results in v oh_max = 2.465v for logic low, v out = v ol_max = v cc_max ? 1.7v using v cc_max = 3.465, this results in v ol_max = 1.765v pd_h = [(2.465v - (3.465v - 2v))/50 ? ] * (3.465v - 2.465v) = 20mw pd_l = [(1.765v - (3.465v - 2v))/50 ? ] * (3.465v - 1.765v) = 10.2mw total power dissipation per output pair = pd_h + pd_l = 30.2mw q1 v out v cco rl 50 v cco - 2v f igure 10 - lvpecl d river c ircuit and t ermination
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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer r eliability i nformation t ransistor c ount the transistor count for ics8531-01 is: 632 t able 7. vs . a ir f low t able

0 200 500 single-layer pcb, jedec standard test boards 67.8 c/w 55.9 c/w 50.1 c/w multi-layer pcb, jedec standard test boards 47.9 c/w 42.1 c/w 39.4 c/w

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ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer p ackage o utline and d imensions - y s uffix n o i t a i r a v c e d e j s r e t e m i l l i m n i s n o i s n e m i d l l a l o b m y s a b b m u m i n i ml a n i m o nm u m i x a m n 2 3 a - -- -0 6 . 1 1 a 5 0 . 0- -5 1 . 0 2 a 5 3 . 10 4 . 15 4 . 1 b 0 3 . 07 3 . 05 4 . 0 c 9 0 . 0- -0 2 . 0 d c i s a b 0 0 . 9 1 d c i s a b 0 0 . 7 2 d . f e r 0 6 . 5 e c i s a b 0 0 . 9 1 e c i s a b 0 0 . 7 2 e . f e r 0 6 . 5 e c i s a b 0 8 . 0 l 5 4 . 00 6 . 05 7 . 0 0 - - 7 c c c - -- -0 1 . 0 t able 8. p ackage d imensions reference document: jedec publication 95, ms-026
8531ay-01 www.icst.com/products/hiperclocks.html rev. b august 9, 2001 13

ics8531-01 l ow s kew , 1- to -9 d ifferential - to -3.3v lvpecl f anout b uffer 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 pt n u o ce r u t a r e p m e t 1 0 - y a 1 3 5 8 s c i1 0 - y a 1 3 5 8 s c ip f q l d a e l 2 3y a r t r e p 0 5 2c 0 7 o t c 0 t 1 0 - y a 1 3 5 8 s c i1 0 - y a 1 3 5 8 s c il e e r d n a e p a t n o p f q l d a e l 2 30 0 0 1c 0 7 o t c 0 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, patent s, or licenses are implied. 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 environmental 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.

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