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8344by 1 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer g eneral d escription the ics8344 is a low voltage, low skew, 1-to-24 differential- to-lvcmos fanout buffer. the ics8344 is designed to trans- late any differential signal levels to lvcmos levels. the low impedance lvcmos outputs are designed to drive 50 se- ries or parallel terminated transmission lines. the effective fanout can be increased to 48 by utilizing the ability of the outputs to drive two series terminated lines. redundant clock applications can make use of the dual clock input. the dual clock inputs also facilitate board level testing. ics8344 is characterized at full 3.3v, full 2.5v and mixed 3.3v input and 2.5v output operating supply modes. guaranteed output and part-to-part skew characteristics make the ics8344 ideal for those clock distribution applica- tions demanding well defined performance and repeatability. f eatures ? twenty-four lvcmos outputs, 7 typical output impedance ? selectable differential clock input pairs for redundant clock applications ? clkx, nclkx pairs can accept the following differential input levels: lvds, lvpecl, lvhstl, sstl, hcsl ? maximum output frequency: 167mhz ? translates any differential input signal (lvpecl, lvhstl, lvds) to lvcmos without external bias networks ? translates any single-ended input signal to lvcmos with resistor bias on nclk input ? multiple output enable pins for disabling unused outputs in reduced fanout applications ? output skew: 275ps (maximum) ? part-to-part skew: 600ps (maximum) ? bank skew: 150ps (maximum) ? propagation delay: 4.3ns (maximum) ? 3.3v, 2.5v or mixed 3.3v, 2.5v operating supply modes ? 0c to 70c ambient operating temperature ? available in standard (rohs 5) and lead-free (rohs 6) packages b lock d iagram p in a ssignment 48 47 46 45 44 43 42 41 40 39 38 37 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 q16 q17 v ddo gnd q18 q19 q20 q21 v ddo gnd q22 q23 q7 q6 v ddo gnd q5 q4 q3 q2 v ddo gnd q1 q0 oe1 oe2 oe3 clk0 nclk0 v dd gnd clk1 nclk1 v dd gnd clk_sel q8 q9 vddo gnd q10 q11 q12 q13 v ddo gnd q14 q15 clk0 nclk0 oe1 oe2 oe3 q0:q7 o8:q15 o16:q23 clk_sel clk1 nclk1 48-lead lqfp 7mm x 7mm x 1.4mm package body y package top view ics8344 0 1
8344by 2 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos 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 6 , 5 , 2 , 1 2 1 , 1 1 , 8 , 7 9 1 q , 8 1 q , 7 1 q , 6 1 q 3 2 q , 2 2 q , 1 2 q , 0 2 q t u p t u o7 . s t u p t u o 3 2 q u r h t 5 1 q . e c n a d e p m i t u p t u o l a c i p y t , 8 2 , 9 , 3 5 4 , 9 3 , 4 3 v o d d r e w o p. v 5 . 2 r o v 3 . 3 t c e n n o c . s n i p y l p p u s t u p t u o , 8 1 , 4 1 , 0 1 , 4 6 4 , 0 4 , 3 3 , 7 2 d n gr e w o p. d n u o r g o t t c e n n o c . d n u o r g y l p p u s r e w o p 3 1l e s _ k l ct u p n in w o d l l u p . s t u p n i 1 k l c n , 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 t u p n i 0 k l c n , 0 k l c s t c e l e s , w o l n e h w 9 1 , 5 1v d d r e w o p. v 5 . 2 r o v 3 . 3 t c e n n o c . s n i p y l p p u s e v i t i s o p 6 11 k l c nt u p n ip u l l u p. r i a p t u p n i k c o l c l a i t n e r e f f i d y r a d n o c e s f o t u p n i g n i t r e v n i 7 11 k l ct u p n in w o d l l u p. r i a p t u p n i k c o l c l a i t n e r e f f i d y r a d n o c e s f o t u p n i g n i t r e v n i - n o n 0 20 k l c nt u p n ip u l l u p. r i a p t u p n i k c o l c l a i t n e r e f f i d y r a m i r p f o t u p n i g n i t r e v n i 1 20 k l ct u p n in w o d l l u p. r i a p t u p n i k c o l c l a i t n e r e f f i d y r a m i r p f o t u p n i g n i t r e v n i - n o n 2 23 e ot u p n ip u l l u p s t u p t u o f o g n i l b a s i d d n a g n i l b a n e s l o r t n o c . e l b a n e t u p t u o . 3 2 q u r h t 6 1 q 3 22 e ot u p n ip u l l u p s t u p t u o f o g n i l b a s i d d n a g n i l b a n e s l o r t n o c . e l b a n e t u p t u o . 5 1 q u r h t 8 q 4 21 e ot u p n ip u l l u p s t u p t u o f o g n i l b a s i d d n a g n i l b a n e s l o r t n o c . e l b a n e t u p t u o . 7 q u r h t 0 q 0 3 , 9 2 , 6 2 , 5 2 6 3 , 5 3 , 2 3 , 1 3 3 q , 2 q , 1 q , 0 q 7 q , 6 q , 5 q , 4 q t u p t u o7 . s t u p t u o 7 q u r h t 0 q . e c n a d e p m i t u p t u o l a c i p y t 2 4 , 1 4 , 8 3 , 7 3 8 4 , 7 4 , 4 4 , 3 4 1 1 q , 0 1 q , 9 q , 8 q 5 1 q , 4 1 q , 3 1 q , 2 1 q t u p t u o7 . s t u p t u o 5 1 q u r h t 8 q . e c n a d e p m i t u p t u o l a c i p y t : 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 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 4f p c d p e c n a t i c a p a c n o i t a p i s s i d r e w o p ) t u p t u o r e p ( v d d v , o d d v 5 6 4 . 3 =f p v d d v , v 5 6 4 . 3 = o d d v 5 2 6 . 2 =f p v d d v , o d d v 5 2 6 . 2 =f 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 t u o e c n a d e p m i t u p t u o 7
8344by 3 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer t able 3a. o utput e nable f unction t able t able 3b. c lock s elect f unction t able t able 3c. c lock i nputs f unction t able 1 k n a b2 k n a b3 k n a b t u p n it u p t u ot u p n it u p t u ot u p n it u p t u o 1 e o7 q - 0 q2 e o5 1 q - 8 q3 e o3 2 q - 6 1 q 0z - i h0 z - i h0 z - i h 1e v i t c a1e v i t c a1 e v i t c a t u p n i l o r t n o ck c o l c l e s _ k l c0 k l c n , 0 k l c1 k l c n , 1 k l c 0d e t c e l e sd e t c e l e s - e d 1d e t c e l e s - e dd e t c e l e s 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 3 e o , 2 e o , 1 e ok l ck l c n3 2 q u r h t 0 q 10 1 w o ld e d n e e l g n i s 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 110 h g i hd e d n e e l g n i s 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 1 e t o n ; d e s a i bw 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 11 1 e t o n ; d e s a i bh 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 b0h 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 11 e t o n ; d e s a i b1w 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 . " 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 l a i t n e r e f f i d e h t g n i r i w " , 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
8344by 4 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer a bsolute m aximum r atings supply voltage, v ddx 4.6v inputs, v i -0.5v to v dd + 0.5v outputs, v o -0.5v to v ddo + 0.5v package thermal impedance, ja 47.9c/w (0 lfpm) storage temperature, t stg -65c to 150c 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 4b. lvcmos dc c haracteristics , v dd = v ddo = 3.3v5%, t a = 0c to 70c t able 4c. d ifferential dc c haracteristics , v dd = v ddo = 3.3v5%, t a = 0c to 70c t able 4a. p ower s upply dc c haracteristics , v dd = v ddo = 3.3v5%, t a = 0c to 70c 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 d d 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 d d 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 d d t n e r r u c y l p p u s e v i t i s o p 0 2 1a 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 i , l e s _ k l c 3 e o , 2 e o , 1 e o 2v d d 3 . 0 +v v l i e g a t l o v w o l t u p n i , l e s _ k l c 3 e o , 2 e o , 1 e o 3 . 0 -8 . 0v i h i t n e r r u c h g i h t u p n i 3 e o , 2 e o , 1 e ov d d v = n i v 5 6 4 . 3 =5a l e s _ k l cv d d 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 3 e o , 2 e o , 1 e ov d d v , 5 6 4 . 3 = n i v 0 =0 5 1 -a l e s _ k l cv d d v , 5 6 4 . 3 = n i 0 =5 -a v h o e g a t l o v h g i h t u p t u o v d d v = o d d v 5 3 1 . 3 = i h o a m 6 3 - = 6 . 2v v l o e g a t l o v w o l t u p t u o v d d v = o d d v 5 3 1 . 3 = i l o a m 6 3 = 6 . 0v 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 1 k l c n , 0 k l c n 5a 1 k l c , 0 k l c 0 5 1a i l i t n e r r u c w o l t u p n i 1 k l c n , 0 k l c n0 5 1 -a 1 k l c , 0 k l c5 -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 5 1 . 03 . 1v v r m c 2 , 1 e t o n ; e g a t l o v t u p n i e d o m n o m m o c 5 . 0 + d n gv d d 5 8 . 0 -v v s a d e n i f e d s i e g a t l o v e d o m n o m m o c : 1 e t o n h i . v s i x k l c n , x 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 : 2 e t o n d d . v 3 . 0 +
8344by 5 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer t able 5a. ac c haracteristics , v dd = v ddo = 3.3v5%, t a = 0c to 70c 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 7 6 1z h m p t h l y a l e d n o i t a g a p o r p 1 e t o n ; h g i h - o t - w o l f z h m 7 6 16 . 23 . 4s n p t l h y a l e d n o i t a g a p o r p 1 e t o n ; w o l - o t - h g i h f z h m 7 6 14 . 23 . 4s n t ) b ( k s6 , 2 e t o n ; w e k s k n a b e h t n o d e r u s a e m v f o e g d e g n i s i r o d d 2 / 0 5 1s p t ) o ( k s6 , 3 e t o n ; w e k s t u p t u o e h t n o d e r u s a e m v f o e g d e g n i s i r o d d 2 / 5 7 2s p t ) p p ( k s6 , 4 e t o n ; w e k s t r a p - o t - t r a p e h t n o d e r u s a e m v f o e g d e g n i s i r o d d 2 / 0 0 6s p t r 5 e t o n ; e m i t e s i r t u p t u o% 0 7 o t % 0 30 0 20 0 0 1s p t f 5 e t o n ; e m i t l l a f t u p t u o% 0 7 o t % 0 30 0 20 0 0 1s p t w p h t d i w e s l u p t u p t u o f z h m 7 6 15 6 . 0 - 2 / d o i r e p t2 / d o i r e p t5 6 . 0 + 2 / d o i r e p ts n z h m 7 6 1 = f5 3 . 25 . 25 6 . 3s n t n e 5 e t o n ; e m i t e l b a n e t u p t u oz h m 7 . 6 6 = f5s n t s i d 5 e t o n ; e m i t e l b a s i d t u p t u oz h m 7 . 6 6 = f4s n . e s i w r e h t o d e t o n s s e l n u z h m 7 6 1 t a d e r u s a e m s r e t e m a r a p l l a v t a t u p t u o 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 o d d . 2 / . 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 e g a t l o v e m a s e h t t a s t u p t u o f o k n a b a n i h t i w w e k s s a d e n i f e d : 2 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 : 3 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 e h t s a d e n i f e d : 4 e t o n v t a 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 o d d . 2 / . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 5 e t o n . 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 : 6 e t o n
8344by 6 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer t able 4e. lvcmos dc c haracteristics , v dd = 3.3v5%, v ddo = 2.5v5%, t a = 0c to 70c t able 4f. d ifferential dc c haracteristics , v dd = 3.3v5%, v ddo = 2.5v5%, t a = 0c to 70c t able 4d. p ower s upply dc c haracteristics , v dd = 3.3v5%, v ddo = 2.5v5%, t a = 0c to 70c 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 d d 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 d d e g a t l o v y l p p u s t u p t u o 5 7 3 . 25 . 25 2 6 . 2v i d d t n e r r u c y l p p u s e v i t i s o p 0 2 1a 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 i , l e s _ k l c 3 e o , 2 e o , 1 e o 2v d d 3 . 0 +v v l i e g a t l o v w o l t u p n i , l e s _ k l c 3 e o , 2 e o , 1 e o 3 . 0 -8 . 0v i h i t n e r r u c h g i h t u p n i 3 e o , 2 e o , 1 e ov d d v = n i v 5 6 4 . 3 =5a l e s _ k l cv d d 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 3 e o , 2 e o , 1 e ov d d v , 5 6 4 . 3 = n i v 0 =0 5 1 -a l e s _ k l cv d d v , 5 6 4 . 3 = n i 0 =5 -a v h o e g a t l o v h g i h t u p t u o v d d v 5 3 1 . 3 = v o d d v 5 7 3 . 2 = i h o a m 7 2 - = 8 . 1v v l o e g a t l o v w o l t u p t u o v d d v 5 3 1 . 3 = v o d d v 5 7 3 . 2 = i l o a m 7 2 = 3 6 . 0v 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 1 k l c n , 0 k l c n 5a 1 k l c , 0 k l c 0 5 1a i l i t n e r r u c w o l t u p n i 1 k l c n , 0 k l c n0 5 1 -a 1 k l c , 0 k l c5 -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 . 03 . 1v v r m c 2 , 1 e t o n ; e g a t l o v t u p n i e d o m n o m m o c 5 . 0 + d n gv d d 5 8 . 0 -v v s a d e n i f e d s i e g a t l o v e d o m n o m m o c : 1 e t o n h i . v s i x k l c n , x 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 : 2 e t o n d d . v 3 . 0 +
8344by 7 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer t able 5b. ac c haracteristics , v dd = 3.3v5%, v ddo = 2.5v5%, t a = 0c to 70c 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 7 6 1z h m p t h l y a l e d n o i t a g a p o r p 1 e t o n ; h g i h - o t - w o l f z h m 7 6 16 . 25 . 4s n p t l h y a l e d n o i t a g a p o r p 1 e t o n ; w o l - o t - h g i h f z h m 7 6 16 . 22 . 4s n t ) b ( k s6 , 2 e t o n ; w e k s k n a b e h t n o d e r u s a e m v f o e g d e g n i s i r o d d 2 / 0 5 1s p t ) o ( k s6 , 3 e t o n ; w e k s t u p t u o e h t n o d e r u s a e m v f o e g d e g n i s i r o d d 2 / 5 7 2s p t ) p p ( k s6 , 4 e t o n ; w e k s t r a p - o t - t r a p e h t n o d e r u s a e m v f o e g d e g n i s i r o d d 2 / 0 0 6s p t r 5 e t o n ; e m i t e s i r t u p t u o% 0 7 o t % 0 30 0 30 0 7 1s p t f 5 e t o n ; e m i t l l a f t u p t u o% 0 7 o t % 0 30 0 30 0 4 1s p t w p h t d i w e s l u p t u p t u o f z h m 7 6 15 6 . 0 - 2 / d o i r e p t2 / d o i r e p t5 6 . 0 + 2 / d o i r e p ts n z h m 7 6 1 = f5 3 . 25 6 . 3s n t n e 5 e t o n ; e m i t e l b a n e t u p t u oz h m 7 . 6 6 = f6s n t s i d 5 e t o n ; e m i t e l b a s i d t u p t u oz h m 7 . 6 6 = f6s n . e s i w r e h t o d e t o n s s e l n u z h m 7 6 1 t a d e r u s a e m s r e t e m a r a p l l a v t a t u p t u o 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 o d d . 2 / . 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 e g a t l o v e m a s e h t t a s t u p t u o f o k n a b a n i h t i w w e k s s a d e n i f e d : 2 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 : 3 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 e h t s a d e n i f e d : 4 e t o n v t a 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 o d d . 2 / . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 5 e t o n . 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 : 6 e t o n
8344by 8 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer t able 4h. lvcmos dc c haracteristics , v dd = v ddo = 2.5v5%, t a = 0c to 70c t able 4i. d ifferential dc c haracteristics , v dd = v ddo = 2.5v5%, t a = 0c to 70c t able 4g. p ower s upply dc c haracteristics , v dd = v ddo = 2.5v5%, t a = 0c to 70c 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 d d e g a t l o v y l p p u s e v i t i s o p 5 7 3 . 25 . 25 2 6 . 2v v o d d e g a t l o v y l p p u s t u p t u o 5 7 3 . 25 . 25 2 6 . 2v i d d t n e r r u c y l p p u s e v i t i s o p 0 2 1a 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 i , l e s _ k l c 3 e o , 2 e o , 1 e o 2v d d 3 . 0 +v v l i e g a t l o v w o l t u p n i , l e s _ k l c 3 e o , 2 e o , 1 e o 3 . 0 -8 . 0v i h i t n e r r u c h g i h t u p n i 3 e o , 2 e o , 1 e ov d d v = n i v 5 2 6 . 2 =5a l e s _ k l cv d d v = n i v 5 2 6 . 2 =0 5 1a i l i t n e r r u c w o l t u p n i 3 e o , 2 e o , 1 e ov d d v , v 5 2 6 . 2 = n i v 0 =0 5 1 -a l e s _ k l cv d d v , v 5 2 6 . 2 = n i 0 =5 -a v h o e g a t l o v h g i h t u p t u o v d d v = o d d v 5 7 3 . 2 = i h o a m 7 2 - = 7 7 . 1v v l o e g a t l o v w o l t u p t u o v d d v = o d d v 5 7 3 . 2 = i l o a m 7 2 = 6 . 0v 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 1 k l c n , 0 k l c n 5a 1 k l c , 0 k l c 0 5 1a i l i t n e r r u c w o l t u p n i 1 k l c n , 0 k l c n0 5 1 -a 1 k l c , 0 k l c5 -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 . 03 . 1v v r m c 2 , 1 e t o n ; e g a t l o v t u p n i e d o m n o m m o c 5 . 0 + d n gv d d 5 8 . 0 -v v s a d e n i f e d s i e g a t l o v e d o m n o m m o c : 1 e t o n h i . v s i x k l c n , x 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 : 2 e t o n d d . v 3 . 0 +
8344by 9 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer t able 5c. ac c haracteristics , v dd = v ddo = 2.5v5%, t a = 0c to 70c 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 7 6 1z h m p t h l y a l e d n o i t a g a p o r p 1 e t o n ; h g i h - o t - w o l f z h m 7 6 17 . 23 . 4s n p t l h y a l e d n o i t a g a p o r p 1 e t o n ; w o l - o t - h g i h f z h m 7 6 17 . 23 . 4s n t ) b ( k s6 , 2 e t o n ; w e k s k n a b e h t n o d e r u s a e m v f o e g d e g n i s i r o d d 2 / 0 5 1s p t ) o ( k s6 , 3 e t o n ; w e k s t u p t u o e h t n o d e r u s a e m v f o e g d e g n i s i r o d d 2 / 5 7 2s p t ) p p ( k s6 , 4 e t o n ; w e k s t r a p - o t - t r a p e h t n o d e r u s a e m v f o e g d e g n i s i r o d d 2 / 0 0 6s p t r 5 e t o n ; e m i t e s i r t u p t u o% 0 7 o t % 0 30 0 30 0 7 1s p t f 5 e t o n ; e m i t l l a f t u p t u o% 0 7 o t % 0 30 0 30 0 4 1s p t w p h t d i w e s l u p t u p t u o f z h m 7 6 15 6 . 0 - 2 / d o i r e p t2 / d o i r e p t5 6 . 0 + 2 / d o i r e p ts n z h m 7 6 1 = f5 3 . 25 6 . 3s n t n e 5 e t o n ; e m i t e l b a n e t u p t u oz h m 7 . 6 6 = f6s n t s i d 5 e t o n ; e m i t e l b a s i d t u p t u oz h m 7 . 6 6 = f6s n . e s i w r e h t o d e t o n s s e l n u z h m 7 6 1 t a d e r u s a e m s r e t e m a r a p l l a v t a t u p t u o 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 o d d . 2 / . 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 e g a t l o v e m a s e h t t a s t u p t u o f o k n a b a n i h t i w w e k s s a d e n i f e d : 2 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 : 3 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 e h t s a d e n i f e d : 4 e t o n v t a 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 o d d . 2 / . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 5 e t o n . 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 : 6 e t o n
8344by 10 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer p arameter m easurement i nformation scope qx lvcmos 3.3v o utput l oad t est c ircuit -1.65v5% gnd v dd, v ddo 1.65v5% scope qx lvcmos v dd v ddo 3.3v/2.5v o utput l oad t est c ircuit 2.05v5% gnd 1.25v5% -1.25v5%
8344by 11 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer 2.5v o utput l oad t est c ircuit scope qx lvcmos 1.25v5% v dd v ddo -1.25v5% gnd d ifferential i nput l evel v cmr cross points v pp nclk0, nclk1 clk0, clk1 gnd v dd o utput s kew qx qy t sk(o) v ddo 2 v ddo 2
8344by 12 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer p art - to -p art s kew qx qy pa rt 1 pa rt 2 t sk(pp) v ddo 2 v ddo 2 p ropagation d elay nclk0, nclk1 clk0, clk1 q0:q23 t pd i nput and o utput r ise and f all t ime clock inputs and outputs 30% 70% 70% 30% t r t f t pw & t p eriod q0:q23 t pw t period v ddo 2 v ddo 2 v ddo 2 t pw t period odc =
8344by 13 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer a pplication i nformation figure 1 shows how the differential input can be wired to accept single ended levels. the reference voltage v_ref = v dd /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 dd = 3.3v, v_ref should be 1.25v and r2/r1 = 0.609. f igure 1 - s ingle e nded s ignal d riving d ifferential i nput r2 1k v dd clk_in + - r1 1k c1 0.1uf v_ref w iring the d ifferential i nput to a ccept s ingle e nded l evels
8344by 14 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer r eliability i nformation t ransistor c ount the transistor count for ics8344 is: 1449 t able 6. ja vs . a ir f low t able ja by velocity (linear feet per minute) 0 200 500 single-layer pcb, jedec standard test boards 67.8c/w 55.9c/w 50.1c/w multi-layer pcb, jedec standard test boards 47.9c/w 42.1c/w 39.4c/w note: for 48-pin lqfp
8344by 15 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer p ackage o utline - y s uffix t able 7. p ackage d imensions reference document: jedec publication 95, ms-026 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 c b b m u m i n i ml a n i m o nm u m i x a m n 8 4 a - -- -0 6 . 1 1 a 5 0 . 0- -5 1 . 0 2 a 5 3 . 10 4 . 15 4 . 1 b 7 1 . 02 2 . 07 2 . 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 5 . 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 5 . 5 e c i s a b 0 5 . 0 l 5 4 . 00 6 . 05 7 . 0 0 - - 7 c c c - -- -8 0 . 0
8344by 16 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer 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 pg n i g a k c a p g n i p p i h se r u t a r e p m e t y b 4 4 3 8y b 4 4 3 8 s c ip f q l d a e l 8 4y a r tc 0 7 o t c 0 t y b 4 4 3 8y b 4 4 3 8 s c ip f q l d a e l 8 4l e e r d n a e p a t 0 0 0 1c 0 7 o t c 0 f l y b 4 4 3 8f l y b 4 4 3 8 s c ip f q l d a e l 8 4 , e e r f - d a e ly a r tc 0 7 o t c 0 t f l y b 4 4 3 8f l y b 4 4 3 8 s c ip f q l d a e l 8 4 , e e r f - d a e ll e e r d n a e p a t 0 0 0 1c 0 7 o t c 0 . t n a i l p m o c s h o r e r a d n a n o i t a r u g i f n o c e e r f - b p e h t e r a r e b m u n t r a p e h t o t x i f f u s " f l " n a h t i w d e r e d r o e r a t a h t s t r a p : e t o n
8344by 17 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer t e e h s y r o t s i h n o i s i v e r v e re l b a te g a pe g n a h c f o n o i t p i r c s e de t a d a 8 t 1 6 1 . t e l l u b e e r f - d a e l d e d d a - n o i t c e s s e r u t a e f . n m u l o c r e d r o / t r a p m o r f x i f e r p " s c i " d e t e l e d - e l b a t n o i t a m r o f n i g n i r e d r o . g n i k r a m e e r f - d a e l d e d d a . t d i h t i w r e t o o f / r e d a e h d e t a d p u 1 1 / 5 / 1
8344by 18 rev. a january 5, 2011 ics8344 l ow s kew , 1- to -24 d ifferential - to -lvcmos f anout b uffer we?ve got your timing solution. sales 800-345-7015 (inside usa) +408-284-8200 (outside usa) fax: 408-284-2775 tech support netcom@idt.com 6024 silver creek valley road san jose, ca 95138 ? 2011 integrated device technology, inc. all right s reserved. product specifications subject to change without notice. idt, th e idt logo, ics and hiperclocks are trademarks of integrated device technology, inc. accelerated thinking is a service mark of integrated device technology, inc. all other brands, product names and marks are or m ay be trademarks or registered trademarks used to identify products or services of their respective owners. printed in usa

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