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ics8535ag-01 www.icst.com/products/hiperclocks.html rev. b july 5, 2001 1

ICS8535-01 l ow s kew , 1- to -4 lvcmos- to -3.3v lvpecl f anout b uffer g eneral d escription the ICS8535-01 is a low skew, high performance 1-to-4 lvcmos-to-3.3v lvpecl fanout buffer and a member of the hiperclocks? family of high performance clock solutions from ics. the ICS8535-01 has two single ended clock inputs. the single ended clock input accepts lvcmos or lvttl in- put levels and translate them to 3.3v lvpecl levels. the clock enable is internally synchronized to eliminate runt clock pulses on the output during asynchronous assertion/ deassertion of the clock enable pin. guaranteed output and part-to-part skew characteristics make the ICS8535-01 ideal for those applications demand- ing well defined performance and repeatability. f eatures ? 4 differential 3.3v lvpecl outputs ? selectable clk0 or clk1 inputs for redundant and multiple frequency fanout applications ? clk0 or clk1 can accept the following differential input levels: lvcmos or lvttl ? maximum output frequency up to 266mhz ? translates lvcmos and lvttl levels to 3.3v lvpecl levels ? output skew: 30ps (maximum) ? part-to-part skew: 150ps (maximum) ? propagation delay: 1.9ns (maximum) ? 3.3v operating supply ? 0c to 70c ambient operating temperature ? industrial temperature information available upon request b lock d iagram p in a ssignment hiperclocks? ,&6 ICS8535-01 20-lead tssop 4.4mm x 6.5mm x 0.92mm body package g package top view v ee clk_en clk_sel clk0 nc clk1 nc nc nc v cc 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 q0 nq0 v cc q1 nq1 q2 nq2 v cc q3 nq3 clk0 clk1 q0 nq0 q1 nq1 q2 nq2 q3 nq3 0 1 clk_en clk_sel d q le
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ICS8535-01 l ow s kew , 1- to -4 lvcmos- to -3.3v lvpecl f anout b uffer t able 2. p in c haracteristics t able 1. p in d escriptions 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 1 k l c , 0 k l c4f p , n e _ k l c l e s _ k l c 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 ? r e b m u ne m a ne p y tn o i t p i r c s e d 1v 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 2n e _ k l ct u p n ip u l l u p k c o l c 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 . h g i h d e c r o f e r a 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 . 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 . t u p n i 1 k l c 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 . t u p n i 0 k l c s t c e l e s , w o l n e h w 40 k l ct u p n in w o d l l u p. t u p n i k c o l c l t t v l / s o m c v l 61 k l ct u p n in w o d l l u p. t u p n i k c o l c l t t v l / s o m c v l 9 , 8 , 7 , 5c nd e s u n u. t c e n n o c o n 8 1 , 3 1 , 0 1v c c r e w o p. v 3 . 3 o t t c e c n n o c . s n i p y l p p u s e v i t i s o p 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 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 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 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 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 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 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 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
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ICS8535-01 l ow s kew , 1- to -4 lvcmos- to -3.3v lvpecl f anout b uffer t able 3a. c ontrol i nput f unction t able t able 3b. c lock i nput f unction t able s t u p n is t u p t u o 1 k l c r o 0 k l c3 q u r h t 0 q3 q n u r h t 0 q n 0w o lh g i h 1h g i hw o l s t u p n is t u p t u o n e _ k l cl e s _ k l ce c r u o s d e t c e l e s3 q u r h t 0 q3 q n u r h t 0 q n 00 0 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 1 k l cw o l ; d e l b a s i dh g i h ; d e l b a s i d 10 0 k l cd e l b a n ed e l b a n e 11 1 k l cd 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 w o h s s a . b 3 e l b a t n i d e b i r c s e d s a s t u p n i 1 k l c d n a 0 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 f igure 1 - clk_en t iming d iagram enabled disabled clk0, clk1 clk_en nq0 - nq3 q0 - q3
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ICS8535-01 l ow s kew , 1- to -4 lvcmos- 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 cc + 0.5v package thermal impedance, ja 73.2 c/w (no airflow) 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 rat- ings are stress specifications only. functional operation 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 extended periods may affect product reliability. t able 4b. lvcmos / lvttl dc c haracteristics , v cc = 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 h i e g a t l o v h g i h t u p n i 1 k l c , 0 k l c25 6 7 . 3v , n e _ k l c l e s _ k l c 25 6 7 . 3v v l i e g a t l o v w o l t u p n i 1 k l c , 0 k l c3 . 0 -3 . 1v , n e _ k l c l e s _ k l c 3 . 0 -8 . 0v i h i t n e r r u c h g i h t u p n i , 1 k l c , 0 k l c l e s _ k l c v n i v = c c v 5 6 4 . 3 =0 5 1a n e _ k l cv n i v = c c v 5 6 4 . 3 =5a i l i t n e r r u c w o l t u p n i , 1 k l c , 0 k l c l e s _ k l c v n i v , v 0 = c c v 5 6 4 . 3 =5 -a n e _ k l cv n i v , v 0 = c c v 5 6 4 . 3 =0 5 1 -a t able 4c. lvpecl dc c haracteristics , v cc = 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 h o 1 e t o n ; e g a t l o v h g i h t u p t u ov c c 4 . 1 -v c c 0 . 1 -v v l o 1 e t o n ; e g a t l o v w o l t u p t u ov c c 0 . 2 -v 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 p6 . 05 8 . 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 c c . v 2 - t able 4a. p ower s upply dc c haracteristics , v cc = 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 p5 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 5a m
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ICS8535-01 l ow s kew , 1- to -4 lvcmos- to -3.3v lvpecl f anout b uffer t able 5. ac c haracteristics , v cc = 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 6 6 2z 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 6 6 20 . 19 . 1s n t ) o ( k s4 , 2 e t o n ; w e k s t u p t u o 1 10 3s 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 1s 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 o8 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 6 6 2 t a d e r u s a e m s r e t e m a r a p l l a . r e t t i j d d a t o n s e o d t r a p e h t . t u p t u o e h t n o r e t t i j e h t l a u q e l l i w t u p n i e h t n o r e t t i j e l c y c - o t - e l c y c e h t . 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 : 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 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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ICS8535-01 l ow s kew , 1- to -4 lvcmos- to -3.3v lvpecl f anout b uffer f igure 2 - o utput l oad t est c ircuit parameter measurement information f igure 3 - o utput s kew scope qx nqx lvpecl v cc v cc = 2v t sk(o) qx nqx qy nqy v ee = -1.3v 0.135v
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ICS8535-01 l ow s kew , 1- to -4 lvcmos- to -3.3v lvpecl f anout b uffer f igure 6 - p ropagation d elay clock inputs and outputs 20% 80% 20% 80% t r t f v swing f igure 5 - i nput and o utput r ise and f all t ime f igure 7 - odc & t p eriod pulse width t period t pw t period odc = clk0, clk 1, qx nqx t pd clk0, clk1 q0 - q3 nq0 - nq3 qx nqx qy nqy part 1 part 2 t sk(pp) f igure 4 - p art - to -p art s kew
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ICS8535-01 l ow s kew , 1- to -4 lvcmos- to -3.3v lvpecl f anout b uffer p ower c onsiderations this section provides information on power dissipation and junction temperature for the ICS8535-01. equations and example calculations are also provided. 1. power dissipation. the total power dissipation for the ICS8535-01 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 * 50ma = 173.25mw ? power (outputs) max = 30.2mw/loaded output pair if all outputs are loaded, the total power is 4 x 30.2mw = 120.8mw total power _max (3.465v, with all outputs switching) = 173.25mw + 120.8mw = 294.05mw 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 low of 200 linear feet per minute and a multi-layer board, the appropriate value is 66.6 c/w per table 6 below. therefore, tj for an ambient temperature of 70 c with all outputs switching is: 70 c + 0.294w * 66.6 c/w = 89.58 c. this is well below the limit of 125 c this calculation is only an example, and the tj will obviously vary depending on the number of outputs that are loaded, supply voltage, air flow, and the type of board (single layer or multi-layer). q ja by velocity (linear feet per minute) 0 200 500 single-layer pcb, jedec standard test boards 114.5 c/w 98.0 c/w 88.0 c/w multi-layer pcb, jedec standard test boards 73.2 c/w 66.6 c/w 63.5 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 q ja for 20-pin tssop, forced convection
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ICS8535-01 l ow s kew , 1- to -4 lvcmos- 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 8. 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 f igure 8 - lvpecl d river c ircuit and t ermination q1 v out v cc rl 50 v cc - 2v
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ICS8535-01 l ow s kew , 1- to -4 lvcmos- to -3.3v lvpecl f anout b uffer r eliability i nformation t ransistor c ount the transistor count for ICS8535-01 is: 412 t able 7. vs . a ir f low t able q ja by velocity (linear feet per minute) 0 200 500 single-layer pcb, jedec standard test boards 114.5 c/w 98.0 c/w 88.0 c/w multi-layer pcb, jedec standard test boards 73.2 c/w 66.6 c/w 63.5 c/w note: most modern pcb designs use multi-layered boards. the data in the second row pertains to most designs.
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ICS8535-01 l ow s kew , 1- to -4 lvcmos- to -3.3v lvpecl f anout b uffer p ackage o utline - g s uffix 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 n i mx a m n0 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 4 . 60 6 . 6 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
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ICS8535-01 l ow s kew , 1- to -4 lvcmos- to -3.3v lvpecl f anout b uffer t able 9. 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 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 recom- mended without additional processing by ics. ics reserves the right to change any circuitry or specifications without notice. i cs 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 1 0 - g a 5 3 5 8 s c i1 0 - g a 5 3 5 8 s c ip o s s t d a e l 0 2e b u t r e p 2 7c 0 7 o t c 0 t 1 0 - g a 5 3 5 8 s c i1 0 - g a 5 3 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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