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83948ayi-01 www.icst.com/products/hiperclocks.html rev. a september 23, 2002 1

ics83948i-01 l ow s kew , 1- to -12 d ifferential - to -lvcmos f anout b uffer g eneral d escription the ics83948i-01 is a low skew, 1-to-12 differ- ential-to-lvcmos fanout buffer and a member of the hiperclocks? family of high performance clock solutions from ics. the ics83948i-01 has two selectable clock inputs. the clk, nclk pair can accept most standard differential input levels. the lvcmos_clk can accept lvcmos or lvttl input levels. the low impedance lvcmos outputs are designed to drive 50 ? series or parallel terminated transmission lines. the effective fanout can be increased from 12 to 24 by utilizing the ability of the outputs to drive two series terminated lines. the ics83948i-01 is characterized at 3.3v core/3.3v output. guaranteed output and part-to-part skew characteristics make the ics83948i-01 ideal for those clock distribution applications demanding well defined performance and repeatability. b lock d iagram p in a ssignment f eatures ? 12 lvcmos outputs ? selectable lvcmos clock or differential clk, nclk inputs ? clk, nclk pair can accept the following differential input levels: lvds, lvpecl, lvhstl, sstl, hcsl ? lvcmos_clk accepts the following input levels: lvcmos or lvttl ? maximum output frequency: 150mhz ? output skew: 350ps (maximum) ? part to part skew: 1.5ns (maximum) ? 3.3v core, 3.3v output ? -40c to 85c ambient operating temperature ? pin compatible with the mpc948/948l hiperclocks? ,&6 32-lead lqfp 7mm x 7mm x 1.4mm package body y package to p v i e w 32 31 30 29 28 27 26 25 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 gnd q4 v ddo q5 gnd q6 v ddo q7 clk_sel lvcmos_clk clk nclk clk_en oe v dd gnd gnd q8 v ddo q9 gnd q10 v ddo q11 q3 v ddo q2 gnd q1 v ddo q0 gnd ics83948i-01 q0 q1 q2 q3 q4 q5 q6 q7 q8 q9 q10 q11 lvcmos_clk clk nclk 1 0 clk_en clk_sel d q oe
83948ayi-01 www.icst.com/products/hiperclocks.html rev. a september 23, 2002 2

ics83948i-01 l ow s kew , 1- to -12 d ifferential - to -lvcmos f anout b uffer t able 1. p in d escriptions r e b m u ne m a ne p y tn o i t p i r c s e d 1l e s _ k l ct u p n ip u l l u p t u p n i k c o l c s o m c v l s t c e l e s . t u p n i t c e l e s k c o l c . w o l n e h w s t u p n i k l c n , k l c s t c e l e s . h g i h n e h w . 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 2k l c _ s o m c v lt u p n ip u l l u p. 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 k c o l c 3k l ct u p n ip u l l u p. t u p n i k c o l c l a i t n e r e f f i d g n i t r e v n i - n o n 4k l c nt u p n in w o d l l u p. t u p n i k c o l c l a i t n e r e f f i d g n i t r e v n i 5n e _ k l ct u p n ip u l l u p. 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 . e l b a n e k c o l c 6e ot u p n ip u l l u p. 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 . e l b a n e t u p t u o 7v d d r e w o p. n i p y l p p u s e r o c , 6 1 , 2 1 , 8 2 3 , 8 2 , 4 2 , 0 2 d n gr e w o p. d n u o r g y l p p u s r e w o p , 5 1 , 3 1 , 1 1 , 9 3 2 , 1 2 , 9 1 , 7 1 1 3 , 9 2 , 7 2 , 5 2 , 8 q , 9 q , 0 1 q , 1 1 q , 4 q , 5 q , 6 q , 7 q 0 q , 1 q , 2 q , 3 q t u p t u o. 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 . s t u p t u o k c o l c 0 3 , 6 2 , 2 2 , 8 1 , 4 1 , 0 1v o d d r e w o p. s n i p y l p p u s t u p t u o : 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 t able 2. p in c haracteristics 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 ( 5 2f 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 ? t able 3a. c lock s elect f unction t able t able 3b. c lock i nput f unction t able t u p n i l o r t n o ck c o l c l e s _ k l ck l c n , k l ck l c _ s o m c v l 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 l e s _ k l ck l c _ s o m c v lk l ck l c n2 1 q : 0 q 0 ? 01w 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 0 ? 10h 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 0 ? 01 e t o n ; d e s a i bw o ld e d n e e l g n i s o t d e d n e e l g n i sg n i t r e v n i n o n 0 ? 11 e t o n ; d e s a i bh g i hd e d n e e l g n i s o t d e d n e e l g n i sg n i t r e v n i n o n 0 ? 1 e t o n ; d e s a i b0h g i hd e d n e e l g n i s o t d e d n e e l g n i sg n i t r e v n i 0 ? 1 e t o n ; d e s a i b1w o ld e d n e e l g n i s o t d e d n e e l g n i sg n i t r e v n i 10 ?? w o ld e d n e e l g n i s 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 ?? h g i hd e d n e e l g n i s o t d e d n e e l g n i sg n i t r e v n i n o n . " 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
83948ayi-01 www.icst.com/products/hiperclocks.html rev. a september 23, 2002 3

ics83948i-01 l ow s kew , 1- to -12 d ifferential - to -lvcmos f anout b uffer a bsolute m aximum r atings supply voltage, v dd 4.6v inputs, v i -0.5v to v dd + 0.5 v outputs, v o -0.5v to v ddo + 0.5v package thermal impedance, ja 47.9 c/w (0 lfpm) storage temperature, tstg -65 c to 150 c 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 4a. p ower s upply c haracteristics , v dd = v ddo = 3.3v0.3v, t a = -40 to 85 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 t u p n i 0 . 33 . 36 . 3v v o d d e g a t l o v y l p p u s t u p t u o 0 . 33 . 36 . 3v i d d t n e r r u c y l p p u s t n e c s e i u q 5 5a m t able 4b. dc c haracteristics , v dd = v ddo = 3.3v0.3v, t a = -40 to 85 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 il t t v l / s o m c v l26 . 3v v l i e g a t l o v w o l t u p n il t t v l / s o m c v l8 . 0v v p p e g a t l o v t u p n i k a e p - o t - k a e pk l c n , k l c5 1 . 03 . 1v v r m c ; e g a t l o v e d o m n o m m o c t u p n i 2 , 1 e t o n k l c n , k l c5 . 0 + d n gv d d 5 8 . 0 -v i n i t n e r r u c t u p n i 0 0 1 a v h o e g a t l o v h g i h t u p t u oi h o a m 0 2 - =5 . 2v v l o e g a t l o v w o l t u p t u oi l o a m 0 2 =4 . 0v s i k l c n , 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 : 1 e t o n v d d . v 3 . 0 + 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 : 2 e t o nv h i .
83948ayi-01 www.icst.com/products/hiperclocks.html rev. a september 23, 2002 4

ics83948i-01 l ow s kew , 1- to -12 d ifferential - to -lvcmos f anout b uffer t able 5. ac c haracteristics , v dd = v ddo = 3.3v0.3v, t a = -40 to 85 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 m0 5 1z h m t d p y a l e d n o i t a g a p o r p ; k l c n , k l c a 1 e t o n 5 . 25 . 6s n ; k l c _ s o m c v l b 1 e t o n 35 . 5s n t ) o ( k s6 , 2 e t o n ; w e k s t u p t u o n o d e r u s a e m v @ e g d e g n i s i r o d d 2 / 0 5 3s p t ) p p ( k s ; w e k s t r a p - o t - t r a p 6 , 3 e t o n k l c n , k l c n o d e r u s a e m v @ e g d e g n i s i r o d d 2 / 5 . 1s n k l c _ s o m c v l 2s n t r e m i t e s i r t u p t u ov 2 o t v 8 . 02 . 00 . 1s n t f e m i t l l a f t u p t u ov 2 o t v 8 . 02 . 00 . 1s n t w p h t d i w e s l u p t u p t u o 0 0 8 - 2 / d o i r e p t0 0 8 + 2 / d o i r e p ts p t l z p t , h z p 4 e t o n ; e m i t e l b a s i d t u p t u o 1 1s n t z l p t , z h p 4 e t o n ; e m i t e l b a n e t u p t u o 1 1s n t s e l b a n e k c o l c ; e m i t p u t e s 5 e t o n o t n e _ k l c k l c 1s n o t n e _ k l c k l c _ s o m c v l 0s n t h e l b a n e k c o l c ; e m i t d l o h 5 e t o n o t k l c n e _ k l c 0s n k l c _ s o m c v l n e _ k l c o t 1s n 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 : a 1 e t o nv o d d . t u p t u o e h t f o 2 / e h t m o r f d e r u s a e m : b 1 e t o nv d d o t t u p n i e h t f o 2 /v o d d 2 /. t u p t u o e h t f o . 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 v t a d e r u s a e m o d d . 2 / h t i w d n a 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 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 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 : 4 e t o n . k c o l c t u p n i e h t f o e g d e g n i l l a f e h t o t e v i t a l e r e r a s e m i t d l o h d n a p u t e s : 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
83948ayi-01 www.icst.com/products/hiperclocks.html rev. a september 23, 2002 5

ics83948i-01 l ow s kew , 1- to -12 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 -1.65v0.15v gnd v dd, v ddo 1.65v0.15v d ifferential i nput l evel v cmr cross points v pp nclk clk gnd v dd
83948ayi-01 www.icst.com/products/hiperclocks.html rev. a september 23, 2002 6

ics83948i-01 l ow s kew , 1- to -12 d ifferential - to -lvcmos f anout b uffer o utput r ise and f all t ime clock outputs 0.8v 2v 2v 0.8v t r t f o utput s kew qx qy t sk(o) v ddo 2 v ddo 2 p art - to -p art s kew qx qy part 1 part 2 t sk(pp) v ddo 2 v ddo 2
83948ayi-01 www.icst.com/products/hiperclocks.html rev. a september 23, 2002 7

ics83948i-01 l ow s kew , 1- to -12 d ifferential - to -lvcmos f anout b uffer t pw & t p eriod q0:q11 t pw t period v ddo 2 v ddo 2 v ddo 2 t pw t period odc = p ropagation d elay nclk clk q0:q11 t pd v ddo 2 ? ? v dd 2 lvcmos_clk
83948ayi-01 www.icst.com/products/hiperclocks.html rev. a september 23, 2002 8

ics83948i-01 l ow s kew , 1- to -12 d ifferential - to -lvcmos f anout b uffer a pplication i nformation figure 2 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 2 - 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
83948ayi-01 www.icst.com/products/hiperclocks.html rev. a september 23, 2002 9

ics83948i-01 l ow s kew , 1- to -12 d ifferential - to -lvcmos f anout b uffer r eliability i nformation t ransistor c ount the transistor count for ics83948i-01 is: 1040 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 67.8 c/w 55.9 c/w 50.1 c/w multi-layer pcb, jedec standard test boards 47.9 c/w 42.1 c/w 39.4 c/w note: most modern pcb designs use multi-layered boards. the data in the second row pertains to most designs.
83948ayi-01 www.icst.com/products/hiperclocks.html rev. a september 23, 2002 10

ics83948i-01 l ow s kew , 1- to -12 d ifferential - to -lvcmos f anout b uffer p ackage o utline - y s uffix t able 7. p ackage d imensions 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 a b b m u m i n i ml a n i m o nm u m i x a m n 2 3 a - -- -0 6 . 1 1 a 5 0 . 0- -5 1 . 0 2 a 5 3 . 10 4 . 15 4 . 1 b 0 3 . 07 3 . 05 4 . 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 6 . 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 6 . 5 e c i s a b 0 8 . 0 l 5 4 . 00 6 . 05 7 . 0 0 - - 7 c c c - -- -0 1 . 0 r eference d ocument : jedec p ublication 95, ms-026
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ics83948i-01 l ow s kew , 1- to -12 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 and industrial applications. any other applications such as those requiring high reliability, or other ext raordinary environmental requirements are not recommended without additional processing by ics. ics reserves the right to change any circuitry or specifications without noti ce. 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 1 0 - i y a 8 4 9 3 8 s c i1 0 i y a 8 4 9 3 8 s c ip f q l d a e l 2 3y a r t r e p 0 5 2c 5 8 o t c 0 4 - t 1 0 - i y a 8 4 9 3 8 s c i1 0 i y a 8 4 9 3 8 s c il e e r d n a e p a t n o p f q l d a e l 2 30 0 0 1c 5 8 o t c 0 4 -

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