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8761cyi www.idt.com rev. c july 27, 2010 1 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator oea mr d_sela0 d_sela1 ref_clk xtal_sel fb_in pll_sel oeb d_selb1 d_selb0 oec d_selc1 d_selc0 oed d_seld1 d_seld0 fbdiv_sel1 fbdiv_sel0 g eneral d escription the ICS8761I is a low voltage, low skew pci / pci-x clock generator. the ICS8761I has a selectable ref_clk or crystal input. the ref_clk input accepts lvcmos or lvttl input levels. the ICS8761I has a fully integrated pll along with frequency configurable clock and feedback outputs for multiplying and regenerating clocks with ?zero delay?. using a 20mhz or 25mhz crystal or a 33.333mhz or 66.666mhz reference frequency, the ICS8761I will generate output frequencies of 33.333mhz, 66.666mhz, 100mhz and 133.333mhz simultaneously. the low impedance lvcmos/lvttl outputs of the ICS8761I are designed to drive 50 series or parallel terminated transmission lines. f eatures ? fully integrated pll ? seventeen lvcmos/lvttl outputs, 15 typical output impedance ? selectable crystal oscillator interface or lvcmos/lvttl ref_clk ? maximum output frequency: 166.67mhz ? maximum crystal input frequency: 40mhz ? maximum ref_clk input frequency: 83.33mhz ? individual banks with selectable output dividers for generating 33.333mhz, 66.66mhz, 100mhz and 133.333mhz simultaneously ? separate feedback control for generating pci / pci-x frequencies from a 20mhz or 25mhz crystal or 33.333mhz or 66.666mhz reference frequency ? cycle-to-cycle jitter: 70ps (maximum) ? period jitter, rms: 17ps (maximum) ? output skew: 250ps (maximum) ? bank skew: 50ps (maximum) ? static phase offset: 0 150ps (maximum) ? full 3.3v or 3.3v core, 2.5v multiple output supply modes ? -40c to 85c ambient operating temperature ? available in both standard and lead-free rohs-compliant packages b lock d iagram p in a ssignment xtal1 xtal2 qa0 qa1 qa2 qa3 qb0 qb1 qb2 qb3 fb_out 3 4 6 12 0 0 0 1 1 0 1 1 0 1 0 0 0 1 1 0 1 1 qc0 qc1 qc2 qc3 qd0 qd1 qd2 qd3 pll osc 0 1 6 12 16 20 0 0 0 1 1 0 1 1 0 0 0 1 1 0 1 1 0 0 0 1 1 0 1 1 64-lead lqfp 10mm x 10mm x 1.4mm package body y package top view ICS8761I ref_clk gnd xtal1 xtal2 v dd xtal_sel pll_sel v dda v dd d_selc0 d_selc1 oec oea d_sela0 d_sela1 gnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 g nd fb_out v ddofb fb_in v dd fbdiv_sel0 fbdiv_sel1 mr v dd d_seld0 d_seld1 oed oeb d_selb0 d_selb1 gnd gnd qa0 v ddoa qa1 gnd qa2 v ddoa qa3 gnd qb0 v ddob qb1 gnd qb2 v ddob qb3 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 gnd qc0 v ddoc qc1 gnd qc2 v ddoc qc3 gnd qd0 v ddod qd1 gnd qd2 v ddod qd3
8761cyi www.idt.com rev. c july 27, 2010 2 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator 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 1k l c _ f e rt u p n in w o d 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 e c n e r e f e r , 7 1 , 6 1 , 2 , 9 2 , 5 2 , 1 2 , 2 5 , 8 4 , 3 3 4 6 , 0 6 , 6 5 d n gr e w o p. d n u o r g y l p p u s r e w o p 4 , 3 , 1 l a t x 2 l a t x t u p n i . t u p t u o e h t s i 2 l a t x . t u p n i e h t s i 1 l a t x . e c a f r e t n i r o t a l l i c s o l a t s y r c 4 4 , 0 4 , 9 , 5v d d r e w o p. s n i p y l p p u s e r o c 6l e s _ l a t xt u p n ip u l l u p l l p e h t s a k c o l c e c n e r e f e r r o r o t a l l i c s o l a t s y r c n e e w t e b s t c e l e s k l c _ f e r s t c e l e s . h g i h n e h w s t u p n i l a t x s t c e l e s . e c r u o s e c n e r e f e r . 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 . w o l n e h w 7l e s _ l l pt u p n ip u l l u p . l l p s t c e l e s , h g i h n e h w . e d o m s s a p y b d n a l l p n e e w t e b s t c e l e s . 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 . k c o l c e c n e r e f e r s t c e l e s , w o l n e h w 8v a d d r e w o p. g n i r e t l i f r o f e t o n s n o i t a c i l p p a e e s . n i p y l p p u s g o l a n a 1 1 , 0 1 , 0 c l e s _ d 1 c l e s _ d t u p n in w o d l l u p . 3 e l b a t n i d e b i r c s e d s a s t u p t u o c k n a b r o f e u l a v e d i v i d s t c e l e s . 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 2 1c e ot u p n ip u l l u p . d e l b a n e e r a s t u p t u o , h g i h n e h w . s t u p t u o c k n a b f o e t a t s s e n i m r e t e d . 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 . d e l b a s i d e r a s t u p t u o , w o l n e h w 3 1a e ot u p n ip u l l u p . d e l b a n e e r a s t u p t u o , h g i h n e h w . s t u p t u o a k n a b f o e t a t s s e n i m r e t e d . 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 . d e l b a s i d e r a s t u p t u o , w o l n e h w 5 1 , 4 1 , 0 a l e s _ d 1 a l e s _ d t u p n in w o d l l u p . 3 e l b a t n i d e b i r c s e d s a s t u p t u o a k n a b r o f e u l a v r e d i v i d s t c e l e s . 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 , 0 2 , 8 1 4 2 , 2 2 , 1 a q , 0 a q 3 a q , 2 a q t u p t u o 5 1 . s t u p t u o k c o l c a k n a b . e c n a d e p m i t u p t u o l a c i p y t . 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 3 2 , 9 1v a o d d r e w o p. s t u p t u o a k n a b r o f s n i p y l p p u s t u p t u o , 8 2 , 6 2 2 3 , 0 3 , 1 b q , 0 b q 3 b q , 2 b q t u p t u o 5 1 . s t u p t u o k c o l c b k n a b . e c n a d e p m i t u p t u o l a c i p y t . 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 1 3 , 7 2v b o d d r e w o p. s t u p t u o b k n a b r o f s n i p y l p p u s t u p t u o 5 3 , 4 3 , 1 b l e s _ d 0 b l e s _ d t u p n in w o d l l u p . 3 e l b a t n i d e b i r c s e d s a s t u p t u o b k n a b r o f e u l a v r e d i v i d s t c e l e s . 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 6 3b e ot u p n ip u l l u p . d e l b a n e e r a s t u p t u o , h g i h n e h w . s t u p t u o b k n a b f o e t a t s s e n i m r e t e d . 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 . d e l b a s i d e r a s t u p t u o , w o l n e h w 7 3d e ot u p n ip u l l u p . d e l b a n e e r a s t u p t u o , h g i h n e h w . s t u p t u o d k n a b f o e t a t s s e n i m r e t e d . 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 . d e l b a s i d e r a s t u p t u o , w o l n e h w 9 3 , 8 3 , 1 d l e s _ d 0 d l e s _ d t u p n in w o d l l u p . 3 e l b a t n i d e b i r c s e d s a s t u p t u o d k n a b r o f e u l a v r e d i v i d s t c e l e s . 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 1 4r mt u p n in w o d l l u p s r e d i v i d l a n r e t n i e h t , h g i h c i g o l n e h w . t e s e r r e t s a m h g i h e v i t c a e h t , w o l c i g o l n e h w . w o l o g o t s t u p t u o e h t g n i s u a c t e s e r e r a . d e l b a n e e r a s t u p t u o e h t d n a s r e d i v i d l a n r e t n i . 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 2 41 l e s _ v i d b ft u p n in w o d l l u p . 3 e l b a t n i d e b i r c s e d s a t u p t u o k c a b d e e f k n a b r o f e u l a v r e d i v i d s t c e l e s . 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 3 40 l e s _ v i d b ft u p n ip u l l u p . 3 e l b a t n i d e b i r c s e d s a t u p t u o k c a b d e e f k n a b r o f e u l a v r e d i v i d s t c e l e s . 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 5 4n i _ b ft u p n in w o d l l u p h t i w s k c o l c g n i t a r e n e g r o f r o t c e t e d e s a h p o t t u p n i k c a b d e e f . 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 . " y a l e d o r e z "
8761cyi www.idt.com rev. c july 27, 2010 3 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator t able 2. p in c haracteristics t able 3a. o utput c ontrol p in f unction t able s t u p n is t u p t u o r ma e ob e oc e od e o3 a q : 0 a q3 b q : 0 b q3 c q : 0 c q3 d q : 0 d q 11111 w o lw o lw o lw o l 01111 e v i t c ae v i t c ae v i t c ae v i t c a x0000 z i hz i hz i hz i h t able 3b. o perating m ode f unction t able s t u p n i e d o m g n i t a r e p o l e s _ l l p 0s s a p y b 1l l p t able 3c. pll i nput f unction t able s t u p n i l e s _ l a t xt u p n i l l p 0k l c _ f e r 1r o t a l l i c s o l a t x r e b m u ne m a ne p y tn o i t p i r c s e d 6 4v b f o d d r e w o p. t u p t u o t u o _ b f r o f n i p y l p p u s t u p t u o 7 4t u o _ b ft u p t u o 5 1 . n i _ b f o t t c e n n o c . t u p t u o k c a b d e e f . e c n a d e p m i t u p t u o l a c i p y t . 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 , 1 5 , 9 4 5 5 , 3 5 , 2 d q , 3 d q 0 d q , 1 d q t u p t u o 5 1 . s t u p t u o k c o l c d k n a b . e c n a d e p m i t u p t u o l a c i p y t . 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 4 5 , 0 5v d o d d r e w o p. s t u p t u o d k n a b r o f s n i p y l p p u s t u p t u o , 9 5 , 7 5 3 6 , 1 6 , 2 c q , 3 c q 0 c q , 1 c q t u p t u o 5 1 . s t u p t u o k c o l c c k n a b . e c n a d e p m i t u p t u o l a c i p y t . 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 2 6 , 8 5v c o d d r e w o p. s t u p t u o c k n a b r o f 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 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 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 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 1 e t o n ; ) t u p t u o r e p ( v d d v , a d d v ; v 5 6 4 . 3 = x o d d v 5 6 4 . 3 =9f p v d d v , a d d v ; v 5 6 4 . 3 = x o d d v 5 2 6 . 2 =1 1f p r t u o e c n a d e p m i t u p t u o 5 1 v : 1 e t o n x o d d v s e t o n e d a o d d v , b o d d v , c o d d v , d o d d v , b f o d d .
8761cyi www.idt.com rev. c july 27, 2010 4 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator t able 3d. c ontrol f unction t able t able 3e. c ontrol f unction t able (pci c onfiguration ) s t u p n i s t u p t u o 1 = l e s _ l l py c n e u q e r f 1 x l e s _ d0 x l e s _ d1 l e s _ v i d b f0 l e s _ v i d b f y c n e u q e r f e c n e r e f e r ) z h m ( 3 x q : 0 x q3 x q : 0 x q ) z h m ( t u o _ b f ) z h m ( 00 0 0 7 6 . 6 62 x3 3 17 6 . 6 6 00 0 1 3 3 . 3 34 x3 3 13 3 . 3 3 00 1 0 5 23 3 . 5 x3 3 15 2 00 1 1 0 27 6 . 6 x3 3 10 2 01 0 0 7 6 . 6 65 . 1 x0 0 17 6 . 6 6 01 0 1 3 3 . 3 33 x0 0 13 3 . 3 3 01 1 0 5 24 x0 0 15 2 01 1 1 0 25 x0 0 10 2 10 0 0 7 6 . 6 61 x7 6 . 6 67 6 . 6 6 10 0 1 3 3 . 3 32 x7 6 . 6 63 3 . 3 3 10 1 0 5 27 6 . 2 x7 6 . 6 65 2 10 1 1 0 23 3 . 3 x7 6 . 6 60 2 11 0 0 7 6 . 6 62 3 3 . 3 37 6 . 6 6 11 0 1 3 3 . 3 31 3 3 . 3 33 3 . 3 3 11 1 0 5 23 3 . 1 x3 3 . 3 35 2 11 1 1 0 27 6 . 1 x3 3 . 3 30 2 , 0 b l e s _ d , 0 a l e s _ d s e t o n e d 0 x l e s _ d . 1 d l e s _ d d n a , 1 c l e s _ d , 1 b l e s _ d , 1 a l e s _ d s e t o n e d 1 x l e s _ d : e t o n . 3 d q : 0 d q d n a , 3 c q : 0 c q , 3 b q : 0 b q , 3 a q : 0 a q s e t o n e d 3 x q : 0 x q . 0 d l e s _ d d n a , 0 c l e s _ d s t u p n i s t u p t u o 1 = l e s _ l l py c n e u q e r f 1 x l e s _ d0 x l e s _ d1 l e s _ v i d b f0 l e s _ v i d b f e c n e r e f e r e g n a r y c n e u q e r f ) z h m ( 3 x q : 0 x q3 x q : 0 x q ) z h m ( t u o _ b f ) z h m ( 00 0 0 3 3 . 3 8 - 6 . 1 42 x7 6 . 6 6 1 - 3 3 . 3 83 3 . 3 8 - 6 . 1 4 00 0 1 7 6 . 1 4 - 3 8 . 0 24 x7 6 . 6 6 1 - 3 3 . 3 87 6 . 1 4 - 3 8 . 0 2 00 1 0 5 2 . 1 3 - 2 6 . 5 13 3 . 5 x7 6 . 6 6 1 - 3 3 . 3 85 2 . 1 3 - 2 6 . 5 1 00 1 1 5 2 - 5 . 2 17 6 . 6 x7 6 . 6 6 1 - 3 3 . 3 85 2 - 5 . 2 1 01 0 0 3 3 . 3 8 - 6 . 1 45 . 1 x5 2 1 - 4 . 2 63 3 . 3 8 - 6 . 1 4 01 0 1 7 6 . 1 4 - 3 8 . 0 23 x5 2 1 - 4 . 2 67 6 . 1 4 - 3 8 . 0 2 01 1 0 5 2 . 1 3 - 2 6 . 5 14 x5 2 1 - 4 . 2 65 2 . 1 3 - 2 6 . 5 1 01 1 1 5 2 - 5 . 2 15 x5 2 1 - 4 . 2 65 2 - 5 . 2 1 10 0 0 3 3 . 3 8 - 6 . 1 41 x3 3 . 3 8 - 6 . 1 43 3 . 3 8 - 6 . 1 4 10 0 1 7 6 . 1 4 - 3 8 . 0 22 x3 3 . 3 8 - 6 . 1 47 6 . 1 4 - 3 8 . 0 2 10 1 0 5 2 . 1 3 - 2 6 . 5 17 6 . 2 x3 3 . 3 8 - 6 . 1 45 2 . 1 3 - 2 6 . 5 1 10 1 1 5 2 - 5 . 2 13 3 . 3 x3 3 . 3 8 - 6 . 1 45 2 - 5 . 2 1 11 0 0 3 3 . 3 8 - 6 . 1 42 7 6 . 1 4 - 8 . 0 23 3 . 3 8 - 6 . 1 4 11 0 1 7 6 . 1 4 - 3 8 . 0 21 7 6 . 1 4 - 8 . 0 27 6 . 1 4 - 3 8 . 0 2 11 1 0 5 2 . 1 3 - 2 6 . 5 13 3 . 1 x7 6 . 1 4 - 8 . 0 25 2 . 1 3 - 2 6 . 5 1 11 1 1 5 2 - 5 . 2 17 6 . 1 x7 6 . 1 4 - 8 . 0 25 2 - 5 . 2 1 , 0 b l e s _ d , 0 a l e s _ d s e t o n e d 0 x l e s _ d . 1 d l e s _ d d n a , 1 c l e s _ d , 1 b l e s _ d , 1 a l e s _ d s e t o n e d 1 x l e s _ d : e t o n . 3 d q : 0 d q d n a , 3 c q : 0 c q , 3 b q : 0 b q , 3 a q : 0 a q s e t o n e d 3 x q : 0 x q . 0 d l e s _ d d n a , 0 c l e s _ d
8761cyi www.idt.com rev. c july 27, 2010 5 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator t able 4a. p ower s upply dc c haracteristics , v dd = v dda = v ddox = 3.3v5% or 2.5v5%, t a = -40c to 85c 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 r o c 5 3 1 . 33 . 35 6 4 . 3v v a d d e g a t l o v y l p p u s g o l a n a 5 3 1 . 33 . 35 6 4 . 3v v x o d d 1 e t o n ; 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 5 7 3 . 25 . 25 2 6 . 2v i d d t n e r r u c y l p p u s r e w o p 5 7 1a m i a d d t n e r r u c y l p p u s g o l a n a 5 5a m i x o d d 2 e t o n ; t n e r r u c y l p p u s t u p t u o 5 2a m v : 1 e t o n x o d d v s e t o n e d a o d d v , b o d d v , c o d d v , d o d d v d n a , b f o d d . i : 2 e t o n x o d d i s e t o n e d a o d d i , b o d d i , c o d d i , d o d d i d n a , b f o d d . 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 ddox + 0.5v package thermal impedance, ja 41.1c/w (0 lfpm) storage temperature, t stg -65c to 150c note: 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 be- yond those listed in the dc characteristics or ac character- istics is not implied. exposure to absolute maximum rating conditions for extended periods may affect product reliability.
8761cyi www.idt.com rev. c july 27, 2010 6 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator t able 4b. lvcmos/lvttl dc c haracteristics , v dd = v dda = 3.3v5%, v ddox = 3.3v5% or 2.5v5%, t a = -40c to 85c 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 t u p n i e g a t l o v h g i h , r m , l e s _ l a t x , d e o : a e o , n i _ b f , x b l e s _ d , x a l e s _ d , l e s _ l l p , x d l e s _ d , x c l e s _ d 1 l e s _ v i d b f , 0 l e s _ v i d b f 2v d d 3 . 0 +v k l c _ f e r2v d d 3 . 0 +v v l i t u p n i e g a t l o v w o l , r m , l e s _ l a t x , d e o : a e o , n i _ b f , x b l e s _ d , x a l e s _ d , l e s _ l l p , x d l e s _ d , x c l e s _ d 1 l e s _ v i d b f , 0 l e s _ v i d b f 3 . 0 -8 . 0v k l c _ f e r3 . 0 -3 . 1v i h i t u p n i t n e r r u c h g i h , n i _ b f , x b l e s _ d , x a l e s _ d , x d l e s _ d , x c l e s _ d , r m 1 l e s _ v i d b f , k l c _ f e r v d d =v n i v 5 6 4 . 3 = v 5 2 6 . 2 r o 0 5 1a , l e s _ l l p , l e s _ l a t x d e o : a e o , 0 l e s _ v i d b f v d d =v n i v 5 6 4 . 3 = v 5 2 6 . 2 r o 5a i l i t u p n i t n e r r u c w o l , n i _ b f , x b l e s _ d , x a l e s _ d , x d l e s _ d , x c l e s _ d , r m 1 l e s _ v i d b f , k l c _ f e r v d d =r o v 5 6 4 . 3 v , v 5 2 6 . 2 n i v 0 = 5 -a , l e s _ l l p , l e s _ l a t x d e o : a e o , 0 l e s _ v i d b f v d d =r o v 5 6 4 . 3 v , v 5 2 6 . 2 n i v 0 = 0 5 1 -a v h o 1 e t o n ; e g a t l o v h g i h t u p t u o v x o d d =v 5 6 4 . 36 . 2v v x o d d v 5 2 6 . 2 =8 . 1 v l o 1 e t o n ; e g a t l o v w o l t u p t u o v x o d d r o v 5 6 4 . 3 = v 5 2 6 . 2 5 . 0v i l z o w o l t n e r r u c e t a t s i r t t u p t u o 5 -a i h z o h g i h t n e r r u c e t a t s i r t t u p t u o 5a 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 x o d d , n o i t c e s n o i t a m r o f n i t n e m e r u s a e m r e t e m a r a p e e s . 2 / . " t i u c r i c t s e t d a o l t u p t u o " t able 5. c rystal c haracteristics t able 6. pll i nput r eference c haracteristics , v dd = v dda = v ddo x = 3.3v5%, t a = -40c to 85c 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 f e r y c n e u q e r f e c n e r e f e r5 . 2 13 3 . 3 8z h m r 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 n o i t a l l i c s o f o e d o m l a t n e m a d n u f y c n e u q e r f 0 18 3z h m ) r s e ( e c n a t s i s e r s e i r e s t n e l a v i u q e 0 7 e c n a t i c a p a c t n u h s 7f p l e v e l e v i r d 1w m
8761cyi www.idt.com rev. c july 27, 2010 7 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator t able 7a. ac c haracteristics , v dd = v dda = v ddox = 3.3v5%, t a = -40c to 85c 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 . 6 6 1z h m ) ? ( t7 , 1 e t o n ; t e s f f o e s a h p c i t a t sz h m 0 5 = f0 5 1 -0 5 1s p t ) b ( k s6 , 2 e t o n ; w e k s k n a b 0 5s p t ) o ( k s6 , 3 e t o n ; w e k s t u p t u o 0 5 2s p t ) c c ( t i j6 ; r e t t i j e l c y c - o t - e l c y c 7 , 4 e t o n ; z h m 0 5 = f0 7s p , l a t x z h m 5 2 = f t u o z h m 3 . 3 3 1 0 9 1s p t ) r e p ( t i j8 , 7 , 6 , 4 e t o n ; s m r , r e t t i j d o i r e p 7 1s p t l e m i t k c o l l l p 1s m t r t / f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 20 5 20 0 8s p c d o7 , 5 e t o n ; e l c y c y t u d t u p t u o 5 45 5% l a n g i s t u p n i k c a b d e e f e g a r e v a e h t d n a k c o l c e c n e r e f e r t u p n i e h t n e e w t e b e c n e r e f f i d e m i t e h t s a d e n i f e d : 1 e t o n v m o r f d e r u s a e m . e l b a t s s i y c n e u q e r f e c n e r e f e r t u p n i e h t d n a d e k c o l s i l l p e h t n e h w d d o t t u p n i e h t f o 2 / v x o d d . t u p t u o e h t f o 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 v t a d e r u s a e m x o d d . 2 / . s t u p n i s o m c v l g n i s u e c n a m r o f r e p r e t t i j : 4 e t o n . e t o n n o i t a c i l p p a o t r e f e r , t u p n i l a t x r o f . k l c _ f e r g n i s u d e r u s a e m : 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 . ) 6 y b e d i v i d ( 0 0 = l e s _ v i d b f ; ) 6 y b e d i v i d ( 0 1 = x x l e s _ d h t i w d e t s e t : 7 e t o n . e u l a v s m r n a s a d e n i f e d s i r e t e m a r a p s i h t : 8 e t o n t able 7b. ac c haracteristics , v dd = v dda = 3.3v5%, v ddo x = 2.5v5%, t a = -40c to 85c 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 . 6 6 1z h m ) ? ( t7 , 1 e t o n ; t e s f f o e s a h p c i t a t sz h m 0 5 = f0 5 3 -0 2s p t ) b ( k s6 , 2 e t o n ; w e k s k n a b 0 5s p t ) o ( k s6 , 3 e t o n ; w e k s t u p t u o 0 5 2s p t ) c c ( t i j6 e t o n ; r e t t i j e l c y c - o t - e l c y c 7 , 4 e t o n ; z h m 0 5 = f0 7s p , l a t x z h m 5 2 = f t u o z h m 3 . 3 3 1 0 9 1s p t ) r e p ( t i j8 , 7 , 6 , 4 e t o n ; s m r , r e t t i j d o i r e p 7 1s p t l e m i t k c o l l l p 1s m t r t / f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 20 5 20 0 8s p c d o7 , 5 e t o n ; e l c y c y t u d t u p t u o 5 45 5% l a n g i s t u p n i k c a b d e e f e g a r e v a e h t d n a k c o l c e c n e r e f e r t u p n i e h t n e e w t e b e c n e r e f f i d e m i t e h t s a d e n i f e d : 1 e t o n v m o r f d e r u s a e m . e l b a t s s i y c n e u q e r f e c n e r e f e r t u p n i e h t d n a d e k c o l s i l l p e h t n e h w d d o t t u p n i e h t f o 2 / v x o d d . t u p t u o e h t f o 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 v t a d e r u s a e m x o d d . 2 / . s t u p n i s o m c v l g n i s u e c n a m r o f r e p r e t t i j : 4 e t o n . e t o n n o i t a c i l p p a o t r e f e r , t u p n i l a t x r o f . k l c _ f e r g n i s u d e r u s a e m : 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 . ) 6 y b e d i v i d ( 0 0 = l e s _ v i d b f ; ) 6 y b e d i v i d ( 0 1 = x x l e s _ d h t i w d e t s e t : 7 e t o n e u l a v s m r n a s a d e n i f e d s i r e t e m a r a p s i h t : 8 e t o n
8761cyi www.idt.com rev. c july 27, 2010 8 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator 3.3v c ore /3.3v o utput l oad ac t est c ircuit 3.3v c ore /2.5v o utput l oad ac t est c ircuit b ank s kew (where x denotes outputs in the same bank) o utput s kew o utput d uty c ycle /p ulse w idth /p eriod c ycle - to -c ycle j itter t jit(cc) = t cycle n ? t cycle n+1 1000 cycles s tatic p hase o ffset o utput r ise /f all t ime p arameter m easurement i nformation scope qx lvcmos 2.05v5% v ddox -1.25v5% v dd , v dda 1.25v5% scope qx lvcmos 1.65v5% -1.65v5% t sk(o) v ddox 2 v ddox 2 qy qx qax, qbx, qcx, qdx ? ? ? ? v ddo x 2 v ddox 2 v ddox 2 t cycle n t cycle n+1 t sk(b) v ddo 2 v ddo 2 ? ? t (?) v dd 2 v dd 2 ref_cl:k fb_in qy qx t pw t period v ddox 2 v ddox 2 v ddox 2 t pw t period odc = clock outputs 20% 80% 80% 20% t r t f qax, qbx, qcx, qdx, fb_out x x v dd , v dda, v ddox gnd gnd
8761cyi www.idt.com rev. c july 27, 2010 9 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator a pplication i nformation c2 spare xta l 2 xta l 1 x1 18pf parallel cry stal c1 spare c rystal i nput i nterface the ICS8761I crystal interface is shown in figure 2. while layout the pc board, it is recommended to provide c1 and c2 spare footprints for frequency fine tuning. for an 18pf f igure 2. c rystal i nput i nterface parallel resonant crystal, the c1 and c2 are expected to be ~10pf and ~5pf respectively. as in any high speed analog circuitry, the power supply pins are vulnerable to random noise. the ICS8761I provides separate power supplies to isolate any high switching noise from the outputs to the internal pll. v dd , v dda , and v ddox should be individually connected to the power supply plane through vias, and bypass capacitors should be used for each pin. to achieve optimum jitter performance, power supply isolation is required. figure 1 illustrates how a ferrite bead along with a 10f and a .01 f bypass capacitor should be connected to each v dda . p ower s upply f iltering t echniques f igure 1. p ower s upply f iltering v dda 10 f .01 f 3.3v .01 f v dd
8761cyi www.idt.com rev. c july 27, 2010 10 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator i nputs : c rystal i nput : for applications not requiring the use of the crystal oscillator input, both xtal_in and xtal_out can be left floating. though not required, but for additional protection, a 1k resistor can be tied from xtal_in to ground. ref_clk i nput : for applications not requiring the use of the reference clock, it can be left floating. though not required, but for additional protection, a 1k resistor can be tied from the ref_clk to ground. lvcmos c ontrol p ins : all control pins have internal pull-ups or pull-downs; additional resistance is not required but can be added for additional protection. a 1k resistor can be used. r ecommendations for u nused i nput and o utput p ins o utputs : lvcmos o utput : all unused lvcmos output can be left floating. we recommend that there is no trace attached.
8761cyi www.idt.com rev. c july 27, 2010 11 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator s chematic e xample figure 3 shows a schematic example of the ICS8761I. in this example, the input is driven by an 18pf parallel crystal. the decoupling capacitors should be physically located near the power pin. for ICS8761I, the unused clock outputs can be left floating. the optional c1 and c2 are spare footprints for frequency fine tuning. f igure 3. ICS8761I c lock g enerator s chematic e xample (u1,44) c9 0.1u (u1,62) c14 0.1u c11 0.1u c16 10u receiv er zo = 50 (u1,58) r5 1k vddo=3.3v (u1,46) c7 0.1u (u1,54) vdd sp = spare, not install vdd c10 0.1u c6 0.1u vdd=3.3v r3 36 vdd receiv er set logic input to '1' rd2 1k (u1,9) r1 36 receiv er zo = 50 r4 36 to logic input pins c12 0.1u x1 25mhz,18pf c4 0.1u r2 36 ru1 1k vddo c2 sp zo = 50 c17 0.1u r6 1k (u1,19) u1 ics8761 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 39 38 37 36 35 34 33 32 31 30 29 28 27 52 51 50 49 48 47 46 45 44 43 42 41 40 63 62 61 60 59 58 57 56 55 54 53 64 ref_clk gnd xta l 1 xta l 2 vdd xta l _ s e l pll_sel vdda vdd d_selc0 d_selc1 oec oea d_sela0 d_sela1 gnd gnd qa0 vddoa qa1 gnd qa2 vddoa qa3 gnd qb0 d_seld0 d_seld1 oed oeb d_selb0 d_selb1 gnd qb3 vddob qb2 gnd qb1 vddob gnd qd2 vddod qd3 gnd fb_out vddofb fb_in vdd fbdiv_sel0 fbdiv_sel1 mr vdd qc0 vddoc qc1 gnd qc2 vddoc qc3 gnd qd0 vddod qd1 gnd set logic input to '0' vddo c8 0.1u vdd vdd (u1,40) c15 0.1u to logic input pins c5 0.1u (u1,23) c3 0.1u vddo ru2 sp vdd logic input pin examples (u1,27) (u1,31) vdd fb c13 0.1u c1 sp (u1,5) receiv er rd1 sp vddo zo = 50 (u1,50) ICS8761I
8761cyi www.idt.com rev. c july 27, 2010 12 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator t ransistor c ount the transistor count for ICS8761I is: 6040 t able 8. ja vs . a ir f low t able for 64 l ead lqfp ja by velocity (linear feet per minute) 0 200 500 single-layer pcb, jedec standard test boards 58.8c/w 48.5c/w 43.2c/w multi-layer pcb, jedec standard test boards 41.1c/w 35.8c/w 33.6c/w note: most modern pcb designs use multi-layered boards. the data in the second row pertains to most designs. r eliability i nformation
8761cyi www.idt.com rev. c july 27, 2010 13 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator p ackage o utline - y s uffix for 64 l ead lqfp t able 9. 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 d c b m u m i n i ml a n i m o nm u m i x a m n 4 6 a - -- -0 6 . 1 1 a 5 0 . 0- -5 1 . 0 2 a 5 3 . 10 4 . 15 4 . 1 b 7 1 . 0- -7 2 . 0 c 9 0 . 0- -0 2 . 0 d c i s a b 0 0 . 2 1 1 d c i s a b 0 0 . 0 1 2 d . f e r 0 5 . 7 e c i s a b 0 0 . 2 1 1 e c i s a b 0 0 . 0 1 2 e . f e r 0 5 . 7 e c i s a b 0 5 . 0 l 5 4 . 0- -5 7 . 0 0 - - 7 c c c - -- -8 0 . 0
8761cyi www.idt.com rev. c july 27, 2010 14 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator t able 10. o rdering i nformation while the information presented herein has been checked for both accuracy and reliability, integrated device technology, inc. ( idt) 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, patents, or licenses are impl ied. this product is intended for use in normal commercial and industrial applications. any other applications such as those requiring high reliability, or other extraordinary environmental requirement s are not recommended without additional processing by idt. idt reserves the right to change any circuitry or specifications without notice. idt does not authorize or warrant any idt product for use i n 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 i y c 1 6 7 8i y c 1 6 7 8 s c ip f q l d a e l 4 6y a r tc 5 8 o t c 0 4 - t i y c 1 6 7 8i y c 1 6 7 8 s c ip f q l d a e l 4 6l e e r & e p a t 0 0 5c 5 8 o t c 0 4 - f l i y c 1 6 7 8f l i y c 1 6 7 8 s c ip f q l " e e r f - d a e l " d a e l 4 6y a r tc 5 8 o t c 0 4 - t f l i y c 1 6 7 8f l i y c 1 6 7 8 s c ip f q l " e e r f - d a e l " d a e l 4 6l e e r & e p a t 0 0 5c 5 8 o t c 0 4 - . 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
8761cyi www.idt.com rev. c july 27, 2010 15 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator 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 0 1 t 1 9 3 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 o i t c e s l a t s y r c d e d d a . r e b m u n t r a p e e r f - d a e l d e d d a - e l b a t n o i t a m r o f n i g n i r e d r o . t e e h s a t a d e h t t u o h g u o r h t t a m r o f d e t a d p u 4 0 / / 5 / 0 1 b 2 t 5 t 0 1 t 3 6 9 0 1 1 1 4 1 c d e g n a h c - e l b a t s c i t s i r e t c a r a h c n i p n i . l a c i p y t f p 4 o t . x a m f p 4 m o r f . l e v e l e v i r d d e d d a - e l b a t s c i t s i r e t c a r a h c l a t s y r c h p a r g a r a p e h t n i e c n e t n e s t s a l d e t c e r r o c - s e u q i n h c e t g n i r e t l i f y l p p u s r e w o p m o r f " . . . g n o l a d a e b e t i r r e f a w o h s e t a r t s u l l i 1 e r u g i f " d a e r o t 0 1 a w o h s e t a r t s u l l i 1 e r u g i f " . " . . . g n o l a r o t s i s e r . m a r g a i d g n i r e t l i f y l p p u s r e w o p d e t c e r r o c d e d d a . s n i p t u p t u o d n a t u p n i d e s u n u r o f s n o i t a d n e m m o c e r . m a r g a i d e l p m a x e c i t a m e h c s d e t c e r r o c . e t o n e e r f - d a e l d e d d a - e l b a t n o i t a m r o f n i g n i r e d r o 6 0 / 3 1 / 1 b0 1 t4 1 6 1 . s c i m o r f t d i h t i w r e t o o f / r e d a e h s ' t e e h s a t a d d e t a d p u . n m u l o c r e b m u n r e d r o / t r a p m o r f x i f e r p s c i d e v o m e r . e g a p t c a t n o c d e d d a 0 1 / 7 2 / 7
8761cyi www.idt.com rev. c july 27, 2010 16 ICS8761I l ow v oltage , l ow s kew , pci / pci-x c lock g enerator 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 ? 2010 integrated device technology, inc. all rights 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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