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| 85322am rev. a july 31, 2001 1 ics85322 g eneral d escription the ics85322 is a dual lvcmos / lvttl-to- differential 2.5v / 3.3v lvpecl translator and a member of the hiperclocks? family of high per- formance clocks solutions from ics. the ics85322 has selectable single ended clock in- puts. the single ended clock input accepts lvcmos or lvttl input levels and translate them to 2.5v / 3.3v lvpecl levels. the small outline 8-pin soic package makes this device ideal for applications where space, high performance and low power are important. f eatures ? 2 differential 2.5v/3.3v lvpecl outputs ? selectable clk0, clk1 lvcmos clock inputs ? clk0 and clk1 can accepts the following input levels: lvcmos or lvttl ? maximum output frequency up to 267mhz ? part-to-part skew: 150ps (maximum) ? 3.3v operating supply voltage (operating range 3.135v to 3.465v) ? 2.5v operating supply voltage (operating range 2.375v to 2.625v) ? 0c to 70c ambient operating temperature ? industrial temperature information available upon request b lock d iagram p in a ssignment ics85322 8-lead soic 3.90mm x 4.92mm x 1.37mm body package m package to p v i e w q0 nq0 q1 nq1 1 2 3 4 q0 nq0 q1 nq1 clk0 clk1 hiperclocks? ,&6 v cc clk0 clk1 v ee 8 7 6 5 85322am rev. a july 31, 2001 2 ics85322 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 2 , 10 q n , 0 qt 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 4 , 31 q n , 1 qt 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 5v 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 61 k l ct u p n ip u 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 70 k l ct u p n ip u 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 8v c c r e w o pv 5 . 2 r o 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 : e t o n p u 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 i1 k l c , 0 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 ? 85322am rev. a july 31, 2001 3 ics85322 t able 3a. p ower s upply dc c haracteristics , v cc = 3.3v5%, t a = 0 c to 70 c a bsolute m aximum r atings supply voltage, v cc 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 112.7 c/w (0lfpm) 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 the dc characteristics or ac characteristics is not implied. exposure to absolute maximum rating conditions for extended periods may affect product reliability. t able 3b. 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 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 5 2a 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 e g a t l o v h g i h t u p n i1 k l c , 0 k l c25 6 7 . 3v v l i e g a t l o v w o l t u p n i1 k l c , 0 k l c3 . 0 -3 . 1v i h i t n e r r u c h g i h t u p n i1 k l c , 0 k l cv 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 i1 k l c , 0 k l cv c c v = n i v 5 6 4 . 3 =0 5 1 -a t able 3c. 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 v = n i v 5 6 4 . 3 =v 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 v = n i v 5 6 4 . 3 =v 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 p5 6 . 09 . 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 - 85322am rev. a july 31, 2001 4 ics85322 t able 4a. 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 7 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 7 6 26 . 08 . 1s n t ) p p ( k s3 , 2 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 o 0 40 6% . e s i w r e h t o d e t o n s s e l n u z h m 3 3 1 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 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 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 : 2 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 : 3 e t o n 85322am rev. a july 31, 2001 5 ics85322 t able 3d. p ower s upply dc c haracteristics , v cc = 2.5v5%, t a = 0 c to 70 c t able 3e. lvcmos / lvttl dc c haracteristics , v cc = 2.5v5%, 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 7 3 . 25 . 25 2 6 . 2v i e e t n e r r u c y l p p u s r e w o p 5 2a 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 e g a t l o v h g i h t u p n i1 k l c , 0 k l c6 . 15 2 9 . 2v v l i e g a t l o v w o l t u p n i1 k l c , 0 k l c3 . 0 -9 . 0v i h i t n e r r u c h g i h t u p n i1 k l c , 0 k l cv c c v = n i 5 2 6 . 2 =5a i l i t n e r r u c w o l t u p n i1 k l c , 0 k l cv c c v = n i 5 2 6 . 2 =0 5 1 -a t able 3f. lvpecl dc c haracteristics , v cc = 2.5v5%, 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 p5 6 . 09 . 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 4b. ac c haracteristics , v cc = 2.5v5%, 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 5 1 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 5 1 28 . 02s n t ) p p ( k s3 , 2 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 o 0 40 6% . e s i w r e h t o d e t o n s s e l n u z h m 3 3 1 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 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 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 : 2 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 : 3 e t o n 85322am rev. a july 31, 2001 6 ics85322 p arameter m easurement i nformation f igure 1b - 2.5v o utput l oad t est c ircuit scope qx nqx lvpecl v cc = 2v v cc v ee = -0.5v 0.125v f igure 1a - 3.3v o utput l oad t est c ircuit scope qx nqx lvpecl v cc = 2v v cc v ee = -1.3v 0.135v 85322am rev. a july 31, 2001 7 ics85322 f igure 2 - p art - to -p art s kew qx nqx qy nqy part 1 part 2 t sk(pp) f igure 3 - 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 85322am rev. a july 31, 2001 8 ics85322 f igure 4 - p ropagation d elay f igure 5 - odc & t p eriod clk0, clk1 q0 - q1 nq0 - nq1 t pd v cc /2 pulse width t period t pw t period odc = clk0, clk1, q0, q1 nq0, nq1 85322am rev. a july 31, 2001 9 ics85322 p ower c onsiderations this section provides information on power dissipation and junction temperature for the ics85322. equations and example calculations are also provided. 1. power dissipation. the total power dissipation for the ics85322 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 * 25ma = 86.6mw ? power (outputs) max = 30.2mw/loaded output pair if all outputs are loaded, the total power is 2 * 30.2mw = 60.4mw total power _max (3.465v, with all outputs switching) = 86.6mw + 60.4mw = 147mw 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 103.3 c/w per table 5 below. therefore, tj for an ambient temperature of 70 c with all outputs switching is: 70 c + 0.147w * 103.3 c/w = 85.2 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 153.3 c/w 128.5 c/w 115.5 c/w multi-layer pcb, jedec standard test boards 112.7 c/w 103.3 c/w 97.1 c/w note: most modern pcb designs use multi-layered boards. the data in the second row pertains to most designs. table 5. thermal resistance ja for 8-pin soic, forced convection 85322am rev. a july 31, 2001 10 ics85322 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 6. 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 6 - lvpecl d river c ircuit and t ermination q1 v out v cc rl 50 v cc - 2v 85322am rev. a july 31, 2001 11 ics85322 r eliability i nformation t ransistor c ount the transistor count for ics85322 is: 269 t able 6. vs . a ir f low t able ja by velocity (linear feet per minute) 0 200 500 single-layer pcb, jedec standard test boards 153.3 c/w 128.5 c/w 115.5 c/w multi-layer pcb, jedec standard test boards 112.7 c/w 103.3 c/w 97.1 c/w note: most modern pcb designs use multi-layered boards. the data in the second row pertains to most designs. 85322am rev. a july 31, 2001 12 ics85322 p ackage o utline - m s uffix t able 7. p ackage d imensions reference document: jedec publication 95, ms-012 l o b m y s s r e t e m i l l i m n u m i n i mm u m i x a m n8 a5 3 . 15 7 . 1 1 a0 1 . 05 2 . 0 b3 3 . 01 5 . 0 c9 1 . 05 2 . 0 d0 8 . 40 0 . 5 e0 8 . 30 0 . 4 ec i s a b 7 2 . 1 h0 8 . 50 2 . 6 h5 2 . 00 5 . 0 l0 4 . 07 2 . 1 0 8 85322am rev. a july 31, 2001 13 ics85322 t able 8. 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, 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. 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 m a 2 2 3 5 8 s c im a 2 2 3 5 8 s c ic i o s d a e l 8e b u t r e p 6 9c 0 7 o t c 0 t - m a 2 2 3 5 8 s c im a 2 2 3 3 5 8 s c il e e r d n a e p a t n o c i o s d a e l 80 0 5 2c 0 7 o t c 0 |
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