. p ate n ted tec h nolo g y . f o ur hs tl di ff e r e n tial output s . t w o s ingle l v ttl/l v c mos in pu t s . op e r atin g fr eq u e n cy up t o 3 00 mh z w it h 1 5 pf load . v e ry lo w outp u t pi n t o p in s ke w < 50 p s . 3.4 - n s p ro pagation delay ( max ) . 2.4 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 t ssop package the po74hstl85350a is a low-skew, 1-to-4 differential fanout buffer targeted to meet the requirements of high-performance clock and data distribution applications. the device is implemented on cmos technology and has a fully differential internal architecture that is optimized to achieve low signal skews at operating frequencies of up to 300mhz . the device features two single-ended input paths that are multiplexed internally. this mux is controlled by the clk_sel pin. the po74hstl85350a functions as a signal-level translator and fanout on lvcmos / lvttl single-ended signal to four hstl differential loads. since the po74hstl85350a 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 description: cl k 0 cl k 1 q 0 n q 0 q 1 n q 1 q 2 n q 2 q 3 n q 3 0 1 clk_en clk_sel d q l e v e e clk_en clk_sel cl k 0 n c cl k 1 n c n c n c v c c 1 2 3 4 5 6 7 8 9 1 0 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 q 0 n q 0 v c c q 1 n q 1 q 2 n q 2 v c c q 3 n q 3 l vcmos input to hst l output 1:4 fanout bu f fer 1 01 / 01 / 10 potato semiconductor corporation po74hstl85350a www.potatosemi.com 300mhz ttl/cmos potato chip
c o nt rol input f un c t i on ta b l e input / o utput f un c t i on t ab 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 c l o ck enabled i,pd gnd p o w er g r ound hstl hstl c ompleme n t output l v c oms / l v t tl clock input l v c oms / l v t tl clock 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 l v cmos/ l v t tl l v cmos/ l v t tl l v cmos/ l v t tl t u r e output s t u p n s i t u p t u o n e _ k l l c e s _ k l e c c r u o s d e t c e l e 3 s q : 0 3 q q n : 0 q n 0 0 0 k l w c o l ; d e l b a s i h d g i h ; d e l b a s i d 1 1 0 k l w c o l ; d e l b a s i h d g i h ; d e l b a s i d 0 0 1 k l d c e l b a n d e e l b a n e 1 1 1 k l d c e l b a n d e e l b a n e s t u p n s i t u p t u o 1 k l c r o 0 k l 3 c q : 0 3 q q n : 0 q n 0 w o h l g i h h 1 g i w h o l 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 q[0:3]# q[0:3] nc clk_sel clk0 clk1 clk_en vee i,pd i,pd i,pu o o p o w er 10,13,18 19 , 16,14,11 20 , 17,15,12 5 , 7 , 8 , 9 3 4 6 2 1 l vcmos input to hst l output 1:4 fanout bu f fer 2 01 / 01 / 10 potato semiconductor corporation po74hstl85350a www.potatosemi.com 300mhz ttl/cmos 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 - -0.7 -1.2 v 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 . l vcmos input to hst l output 1:4 fanout bu f fer 3 01 / 01 / 10 potato semiconductor corporation po74hstl85350a www.potatosemi.com 300mhz ttl/cmos 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 3.4 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 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 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 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 50 350 300 l vcmos input to hst l output 1:4 fanout bu f fer 4 01 / 01 / 10 potato semiconductor corporation po74hstl85350a www.potatosemi.com 300mhz ttl/cmos potato chip
test waveforms figure 2. hst l output figure 1. l vttl/ l vcmos input w a veform definition figure 3. propogation dela y , output pulse ske w , and output-to-output skew for d to output pair tphl tplh tpd input clock output clock another output clock vo tsk(o) vo t r ,tf, 20-80% input 3v 1.5v 0v figure 4. clk_en t iming diagram ena b led disa b led clk clk_en n q 0 : n q 3 q 0 : q 3 l vcmos input to hst l output 1:4 fanout bu f fer 5 01 / 01 / 10 potato semiconductor corporation po74hstl85350a www.potatosemi.com 300mhz ttl/cmos potato chip
test cir c uit x.xx x.xx denotes dimensions in millimeters seating plane packaging mechanical drawing: 20 pin tssop .252 .260 .047 1.20 .002 .006 .0256 bsc 1 20 .169 .177 0.05 0.15 4.3 4.5 6.4 6.6 0.65 0.19 0.30 .007 .012 max .018 .030 .004 .008 .238 .269 6.1 6.7 0.45 0.75 0.09 0.20 50ohm 15pf to 2pf 15pf to 2pf vcc pulse generator d.u.t l vcmos input to hst l output 1:4 fanout bu f fer 6 01 / 01 / 10 potato semiconductor corporation po74hstl85350a www.potatosemi.com 300mhz ttl/cmos potato chip
l vcmos input to hst l output 1:4 fanout bu f fer p a c k ag i ng mec h a n ic al d r a w i ng : 2 0 p i n t ss o p .252 .260 .047 1.20 .002 .006 seating plane .0256 bsc 1 20 .169 .177 0.05 0.15 4.3 4.5 6.4 6.6 0.65 0.19 0.30 .007 .012 max .018 .030 .004 .008 .238 .269 6.1 6.7 0.45 0.75 0.09 0.20 x.xx x.xx denotes dimensions in millimeters ic ordering information top-marking ordering code package pb-free & green po74hstl85350asu for tube po74hstl85350asr for tape & reel po74hstl85350as -40 c to 85 c -40 c to 85 c t a pb-free & green 20pin 173mil tssop ic package information package t 16 8 t op l eft corner 39 (12?) 3000 64 (20?) 74 20pin 173mil tssop 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) 7 01 / 01 / 10 potato semiconductor corporation po74hstl85350a www.potatosemi.com 300mhz ttl/cmos potato chip po74hstl85350as 20pin 173mil tssop
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