. p ate n ted tec h nolo g y . f o ur hs tl di ff e r e n tial output s . t h e t w o pai r of l vds /l vp ecl/ hs tl/ d i ff e r e n tial o r s i ng le - e n ded in p ut s . ho t -sw appable/ - in s e r tabl e . op e r atin g fr eq u e n cy up t o 5 00 mh z w it h 2 p f load . op e r atin g fr eq u e n cy up t o 4 80 mh z w it h 5 p f loa d . op e r atin g fr eq u e n cy up t o 4 00 mh z w it h 1 5 pf l o a d . v e ry lo w outp u t pi n t o p in s ke w < 80 p s . v e ry lo w pul s e s ke w < 8 0 p s . 2.8 - n s p ro pagation delay ( t y pical ) . 2.3 v t o 3.6 v p ow e r su ppl y . i n d u s t r ial tempe r atu r e r an g e: ? 4 0 c to 8 5 c . 2 0- pin 209 mil ssop package the po74hstl314 is a low-skew, 2-to-4 differential fanout buffer targeted to meet the requirements of high-performance clock and data distribution applications. the device is implemented on 0.35um cmos technology and has a fully differential internal architecture that is optimized to achieve low signal skews at operating frequencies of up to 500mhz . the device features two differential input paths that are multiplexed plexed internally. this mux is controlled by the clk_sel pin. the po74hstl314 may function not only as a differential clock buffer but also as a signal-level translator and fanout on hstl or lvcmos / lvttl single-ended signal to four hstl differential loads. since the po74hstl314 introduces negligible jitter to the timing budget, it is the ideal choice for distributing high frequency, high precision clocks across back-planes and boards in communication systems. features: p i n co n f i gu r at i on l o gi c bloc k d ia g r a m q 0 q 0 # q 1 q 1 # q 2 q 2 # q 3 q 3 # v c c c l k a c l k a # c l k b c l k b # c l k _ s e l v c c 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 1 0 po74hstl314 v c c q0 q 0 # q1 q 1 # q2 q 2 # q3 q 3 # v c c v c c n c v c c c l k_s e l c l k a clk a # c l k b clk b # gnd v c c description: 2.3v - 3.6v 2:4 di f ferential clock/data fanout bu f fer 1 01 / 01 / 10 potato semiconductor corporation po74hstl314a www.potatosemi.com 500mhz hstl potato chip
f un c t io n ta b l e pi n ch arac t eri st ic s pi n d e f i n i t io n s input clock select with pull down resistor l vds , pecl , hstl l vds , pecl , hstl l vds , pecl , hstl l vds , pecl , hstl input clock sele c t with pull d o wn r esis t or input clock sele c t with pull up r esis t or input clock sele c t with pull up r esis t or i,pu i,pu gnd p o w er g r ound hstl hstl cl k a , cl k a# input pair is a c ti v e ( d efault c ondition with no c onne c tion t o pin) cl k a c an b e d r i v en with l vds , ecl , pecl , hstl or t tl c omp a tible signals with r espe c ti v e p o w er c onfigu r a tions clk b , clkb# input pair is a c ti v e clkb c an b e d r i v en with l vds , ecl , pecl , hstl or t tl c omp a tible signals with r espe c ti v e p o w er c onfigu r a tions cont rol c lk _s el 0 1 c ompleme n t output d efault dif f e r e n tial cl o ck input no c onne c t p o w er suppl y , p ositi v e c onne c tion p o w er l v cmos t u r e output l o b m y s r e t e m a r a s p n o i t i d n o c t s e m t u m i n i m l a c i p y t m u m i x a m s t i n u c n i e c n a t i c a p a c t u p n i f 4 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 88 88 k k 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 vcc vcc name i/o t ype description pin vee q[0:3]# q[0:3] nc clk_sel clka clka# clkb clkb # i,pd i,pd i,pd o o p o w er 1 , 10,11,20,3 18 , 16,14,12 19 , 17,15,13 2 4 5 6 7 8 9 2.3v - 3.6v 2:4 di f ferential clock/data fanout bu f fer 2 01 / 01 / 10 potato semiconductor corporation po74hstl314a www.potatosemi.com 500mhz hstl potato chip
dc ele c t r ica l ch ara c t eri s t ic s s y m b o l descrip t i o n tes t c o ndi t i o n s m i n t y p m a x uni t v o h o u t p u t h i g h v o l t a g e v cc = 3 v v i n = v i h o r v i l , i o h = - 1 2 m a 2. 4 3 - v v o l o u t p u t l o w v o l t a g e v cc = 3 v v i n = v i h o r v i l , i o h = 1 2 m a - 0.3 0.5 v v i k c l a m p d i o d e v o l t a g e v c c = m i n . a n d i i n = - 1 8 m a v c c = 0 v . v i or vo = 0v to 5.5v - -0.7 -1.2 v i - - + n o t es : 1 . f o r c o n d i t i o n s s h o w n a s m a x . o r m i n . , u s e a p p r o p r i a t e v a l u e s p e c i f i e d u n d e r e l e c t r i c a l c h a r a c t e r i s t i c s fo r t h e a p p l i c a b l e d e v i c e t y p e . 2 . t y p i c a l v a l u e s a r e a t v c c = 3 . 3 v , 2 5 c a m b i e n t . 3 . t h i s p a r a m e t e r i s g u a r a n t e e d b u t n o t t e s t e d . 4 . n o t m o r e t h a n o n e o u t p u t s h o u l d b e s h o r t e d a t o n e t i m e . d u r a t i o n o f t h e t e s t s h o u l d n o t e x ce e d o n e s e c o n d . 5 . v o h = v c c ? 0 . 6 v a t r a t e d c u rr e n t m ax i m u m ra t i n g s d e s c r i p t i on m a x u n i t s t or a g e tem p e r at ur e -65 t o 150 c operation tem p eratu r e -40 to 85 c operation volt a g e -0.5 to +4.6 v i nput volt a ge -0.5 to +5.5 v output volta g e -0.5 to vc c + 0.5 v n o t e : s t re s s e s g r eate r t h a n l i s t e d u n d e r m a x i m u m r a t i n g s m a y c a u s e p e r m a n e n t d a m a g e t o t h e d e v i c e . t h i s is a stress rati n g o n l y a n d f u n c ti o n a l o pe r ati o n o f t h e d e v i c e a t t h e s e o r a n y o t h e r c o n d iti o n s a b o v e t h o s e i n d i c a t e d i n t h e o p e rati o n a l secti o n s o f t h i s s p eci f icati o n i s n o t i m p lie d . e x p o s u r e t o a b s o l u te m a x i m u m r a ti n g c o n d iti o n s f o r e x t e n d e d p e r i o d s m a y a f f e c t relia b ili t y s p ec i f icati o n is n o t i m p lie d . m ultiple supplies : t he v oltage on a n y input or i/o pin c annot e x c eed the p o w er pin du r ing p o w er-u p . p o w er supply sequencing is n o t r equi r e d . off p o w e r o ff o u tput lea k a g e c urr en t ua -5 2.3v - 3.6v 2:4 di f ferential clock/data fanout bu f fer 3 01 / 01 / 10 potato semiconductor corporation po74hstl314a www.potatosemi.com 500mhz hstl potato chip
po w er supply c h aracteristics s y m b o l descrip t i o n tes t c o ndi t i o n s ( 1 ) m i n t y p m a x uni t ic c q qu i e s c e n t p o w e r s u p p l y c ur r e n t v cc = m a x , v i n = v c c o r g n d - 0.1 30 ua n o t es : 1 . f o r c o n d i t i o n s s h o w n a s m a x . o r m i n . , u s e a p p r o p r i a t e v a l u e s p e c i f i e d u n d e r e l e c t r i c a l c h a r a c t e r i s t i c s fo r t h e a p p l i c a b l e d e v i c e t y p e . 2 . t y pic a l v a l u e s a r e a t v c c = 3 . 3 v , 2 5 c a m b i e n t . 3 . t h i s p a r a m e t e r i s g u a r a n t e e d b u t n o t t e s t e d . 4 . n o t m o r e t h a n o n e o u t p u t s h o u l d b e s h o r t e d a t o n e t i m e . d u r a t i o n o f t h e t e s t s h o u l d n o t e x c e e d o n e s e c o n d . s w i t c h i ng ch ara c t eri s t ic s t i n u x a m ) 1 ( s n o i t i d n o c t s e t n o i t p i r c s e d l o b m y s t pd p r o p a g a t i o n d e l a y cl k a or cl k b to o ut p ut pai r c l = 1 5 p f 3.2 ns t r / t f r i s e / f a l l t i m e 0 . 8 v ? 2 . 0 v 0.8 ns t s k ( p ) p u l s e s k e w ( s a m e p a c k a g e ) tsk(o) o ut p u t p i n t o p i n s k e w ( s a m e p a c k a g e ) ps ps ps t s k ( p p ) o u t p u t s k e w ( d i ff e r e n t p a c k a g e ) f m ax f p 5 1 = l c y c n e u q e r f t u p n i 250 mhz f m ax f p 5 = l c y c n e u q e r f t u p n i 300 mhz f m ax f p 2 = l c y c n e u q e r f t u p n i 400 mhz n o t es : 1 . s e e t e s t c i r c u i t s a n d w a v e f o r ms . 2 . t p l h , t p h l , t s k ( p ) , a n d t s k ( o ) a r e p r o d u c t i o n t e s t e d . a l l o t h e r p a r a m e t e r s g u a r a n t e e d b u t n o t p r o d u c t i o n t e s t e d . 3 . a i r f l o w o f 1 m / s i s r e c o mm e n d e d f o r f r e q u e n c i e s a b o v e 1 3 3 m h z c l = 1 5 p f , 1 2 5 m h z c l = 1 5 p f , 1 2 5 m h z c l = 1 5 p f , 1 2 5 m h z 80 80 350 400 480 500 2.3v - 3.6v 2:4 di f ferential clock/data fanout bu f fer 4 01 / 01 / 10 potato semiconductor corporation po74hstl314a www.potatosemi.com 500mhz hstl potato chip
te s t w av e f o r m s vp p range 0 v -vcc figure 1. l vds/ pecl/ ecl/ hst l /differentia l input w a veform definitions figure 2. hstl/hst l output figure 3. propogation dela y , output pulse ske w , and output-to-output skew for both clk a or clkb to output pair vpp tphl tplh tpd input clock output clock another output clock vo tsk(o) vcc= 3.3v vee=0.0v vih vil vpp vcc vee vo t r ,tf, 20-80% 2.3v - 3.6v 2:4 di f ferential clock/data fanout bu f fer 5 01 / 01 / 10 potato semiconductor corporation po74hstl314a www.potatosemi.com 500mhz hstl potato chip
p a c k a g i ng mec h a n ica l d r a w i ng : 2 0 p i n ss o p 2.3v - 3.6v 2:4 di f ferential clock/data fanout bu f fer .272 .295 .078 .002 seating plane .0098 max. .0256 bsc 1 20 .197 .220 0.25 x.xx x.xx denotes dimensions in millimeters 0.050 5.00 5.60 2.00 6.90 7.50 0.65 max min .022 .037 .004 .009 .291 .322 7.40 8.20 0.55 0.95 0.09 0.25 test cir c uit 50ohm 50ohm 50pf to 2pf 50pf to 2pf 6 01 / 01 / 10 potato semiconductor corporation po74hstl314a www.potatosemi.com 500mhz hstl potato chip
top-marking ic ordering information ordering code package 20pin 209mil ssop pb-free & green po74hstl314as u for tube po74hstl314as r for tape & reel po74hstl314as po74hstl314as -40 c to 85 c -40 c to 85 c t a 2.3v - 3.6v 2:4 di f ferential clock/data fanout bu f fer 7 01 / 01 / 10 potato semiconductor corporation po74hstl314a www.potatosemi.com 500mhz hstl potato chip ic package information package ss 16 12 t op l eft corner 26 (12?) 2000 43 (20?) 66 20-pin 209mil ssop code package type tape width tape trailer tube tape & reel length tape pitch qty length tape leader per tape qty per pin 1 location (mm) (mm) 20pin 209mil ssop pb-free & green
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