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843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 1 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer g eneral d escription the ICS843001I-22 is a a highly versatile, low phase noise lvpecl/lvcmos synthesizer which can generate low jitter reference clocks for a variety of communications applications and is a member of the hiperclocks tm family of high performance clock solutions from ics. the dual crystal interface allows the synthesizer to support up to two communications standards in a given application (i.e. 1gb ethernet with a 25mhz crystal and 1gb fibre channel using a 25.5625mhz crystal). the rms phase jitter performance is typically less than 1ps, thus making the device acceptable for use in demanding applications such as oc48 sonet and 10gb ethernet. the ICS843001I-22 is packaged in a small 24-pin tssop package. f eatures ? one 3.3v or 2.5v lvpecl output pair and one lvcmos/lvttl output ? selectable crystal oscillator interface or lvcmos/lvttl single-ended input ? vco range: 490mhz - 640mhz ? output frequency range: 490mhz - 640mhz ? supports the following applications: sonet, ethernet, fibre channel, serial ata, and hdtv ? rms phase jitter @ 125mhz (1.875mhz - 20mhz): 0.5ps (typical) ? full 3.3v or 2.5v supply modes ? -40c to 85c ambient operating temperature ? available in both, standard and rohs/lead-free compliant packages hiperclocks? ic s p in a ssignment 11 10 01 00 00 01 10 11 phase detector vco 490mhz -640mhz 000 18 001 22 010 24 011 25 100 32 (default) 101 40 n 000 1 001 2 010 3 011 4 (default) 100 5 101 6 110 8 111 10 m 3 3 osc osc ICS843001I-22 24-lead tssop 4.40mm x 7.8mm x 0.92mm package body g package top view v cco _ lvcmos n0 n1 n2 v cco _ lvpecl q nq v ee v cca v cc xtal_out1 xtal_in1 1 2 3 4 5 6 7 8 9 10 11 12 ref_out v ee oe m2 m1 m0 mr sel1 sel0 clk xtal_in0 xtal_out0 24 23 22 21 20 19 18 17 16 15 14 13 b lock d iagram n2:n0 sel0 sel1 xtal_in0 xtal_out0 xtal_in1 xtal_out1 clk mr m2:m0 oe q nq pulldown pulldown pulldown pulldown ref_out c ontrol i nput f unction t able pullup/pulldown t u p n i l o r t n o cs t u p t u o e oq n / qt u o _ f e r 0z - h g i hz - h g i h 1z - h g i he v i t c a t a o l fe v i t c az - h g i h
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 2 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer 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 5 , 1 v , s o m c v l _ o c c v l c e p v l _ o c c r e w o p. s n i p y l p p u s t u p t u o 3 , 21 n , 0 nt u p n ip u l l u p . 4 = e u l a v t l u a f e d . s n i p t c e l e s r e d i v i d t u p t u o . c 3 e l b a t e 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 42 nt u p n in w o d l l u p 7 , 6q n , qt u p u o. s l e v e l e c a f r e t n i l c e p v l . r i a p t u p t u o l a i t n e r e f f i d 3 2 , 8v e e r e w o p. n i p y l p p u s e v i t a g e n 9v a c c r e w o p. n i p y l p p u s g o l a n a 0 1v c c r e w o p. n i p y l p p u s e r o c 1 1 2 1 , 1 t u o _ l a t x 1 n i _ l a t x t u p n i , t u p t u o e h t s i 1 t u o _ l a t x . e c a f r e t n i l a t s y r c t n a n o s e r l e l l a r a p . t u p n i e h t s i 1 n i _ l a t x 3 1 4 1 , 0 t u o _ l a t x 0 n i _ l a t x t u p n i , t u p t u o e h t s i 0 t u o _ l a t x . e c a f r e t n i l a t s y r c t n a n o s e r l e l l a r a p . t u p n i e h t s i 0 n i _ l a t x 5 1k l ct u p n in w o d l l u p. t u p n i k c o l c l t t v l / s o m c v l 7 1 , 6 11 l e s , 0 l e st u p n in w o d l l u p . d 3 e l b a t e 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 . s n i p t c e l e s x u m t u p n i 8 1r mt u p n in w o d l l u p e r a 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 q n t u p t u o d e t r e v n i e h t d n a w o l o g o t q t u p t u o e u r t e h t g n i s u a c t e s e r 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 e h t , w o l c i g o l n e h w . h g i h o g o 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 . d e l b a n e 0 2 , 9 11 m , 0 mt u p n in w o d l l u p . 2 3 = e u l a v t l u a f e d . s n i p t c e l e s r e d i v i d k c a b d e e f . b 3 e l b a t e 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 22 mt u p n ip u l l u p 2 2e ot u p n i . ) t a o l f / w o l / h g i h ( , e l b a n e t u p t u o k c o l c e t a t s - 3 . e l b a t n o i t c n u f t u p n i l o r t n o c , 1 e g a p e e s 4 2t u o _ f e rt 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 . t u p t u o k c o l c e c n e r e f e r : 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 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 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 t u o e c n a d e p m i t u p t u ok l c _ f e r5 1
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 3 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer t able 3a. c ommon c onfigurations t able t able 3b. p rogrammable m o utput d ivider f unction t able t able 3c. p rogrammable n o utput d ivider f unction t able t able 3d. b ypass m ode f unction t able s t u p n i r e d i v i d m e u l a v ) z h m ( y c n e u q e r f t u p n i 2 m1 m0 mm u m i n i mm u m i x a m 000 8 12 2 . 7 26 5 . 5 3 00 1 2 27 2 . 2 29 0 . 9 2 010 4 21 4 . 0 27 6 . 6 2 011 5 26 . 9 16 . 5 2 10 0 2 31 3 . 5 10 2 10 1 0 45 2 . 2 16 1 s t u p n i e u l a v e d i v i d n 2 n1 n0 n 000 1 00 1 2 010 3 011 4 ) t l u a f e d ( 10 0 5 10 1 6 110 8 111 0 1 t u p n i e u l a v r e d i v i d me u l a v r e d i v i d n) z h m ( o c v y c n e u q e r f t u p t u o ) z h m ( n o i t a c i l p p a ) z h m ( k c o l c e c n e r e f e r 7 22 284 9 55 2 . 4 7v t d h 4 . 2 25 280 6 50 7 5 7 . 4 24 284 9 55 2 . 4 7v t d h 5 24 230 0 60 0 2r o s s e c o r p 9 4 6 1 5 3 8 . 4 10 48 6 6 0 4 . 3 9 55 4 2 8 5 7 1 . 4 7v t d h 4 4 . 9 12 348 0 . 2 2 62 5 . 5 5 1t e n o s 4 4 . 9 12 388 0 . 2 2 66 7 . 7 7t e n o s 4 4 . 9 12 318 0 . 2 2 68 0 . 2 2 6t e n o s 4 4 . 9 12 328 0 . 2 2 64 0 . 1 1 3t e n o s 5 2 1 3 5 . 9 12 345 2 65 2 . 6 5 1e g i g 0 1 0 25 220 0 50 5 2t e n r e h t e 5 25 255 2 65 2 1e g i g 1 5 25 20 15 2 65 . 2 6e g i g 1 5 24 260 0 60 0 1s s e r p x e i c p 5 24 240 0 60 5 1a t a s 5 24 280 0 65 7a t a s 5 2 6 5 . 6 24 265 . 7 3 65 2 . 6 0 11 l e n n a h c e r b i f 5 2 6 5 . 6 24 235 . 7 3 65 . 2 1 2l e n n a h c e r b i f g i g 4 5 2 6 5 . 6 24 245 . 7 3 65 7 3 . 9 5 1l e n n a h c e r b i f g i g 0 1 5 2 . 1 38 135 . 2 6 55 . 7 8 1t e n r e h t e g i g 2 1 s t u p n i e c n e r e f e r t u p n i e d o m l l p 1 l e s0 l e s 00 0 l a t xe v i t c a 01 1 l a t xe v i t c a 10 k l ce v i t c a 11 k l cs s a p y b
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 4 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer t able 4a. p ower s upply dc c haracteristics , v cc = v cca = v cco_lvcmos, v cco_lvpecl = 3.3v10%, ta = -40c to 85c a bsolute m aximum r atings supply voltage, v cc 4.6v inputs, v i -0.5v to v cc + 0.5v outputs, i o (lvpecl) continuous current 50ma surge current 100ma outputs, v o (lvcmos) -0.5v to v cco + 0.5v package thermal impedance, ja 70c/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. t able 4b. p ower s upply dc c haracteristics , v cc = v cca = v cco_lvcmos, v cco_lvpecl = 2.5v5%, ta = -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 c c e g a t l o v y l p p u s e r o c5 7 3 . 25 . 25 2 6 . 2v v a c c e g a t l o v y l p p u s g o l a n a5 7 3 . 25 . 25 2 6 . 2v v , l c e p v l _ o c c v s o m c v l _ o c c e g a t l o v y l p p u s t u p t u o5 7 3 . 25 . 25 2 6 . 2v i e e t n e r r u c y l p p u s r e w o p 5 5 1a m i o c c t n e r r u c y l p p u s t u p t u o 8a 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 c c e g a t l o v y l p p u s e r o c7 9 . 23 . 33 6 . 3v v a c c e g a t l o v y l p p u s g o l a n a7 9 . 23 . 33 6 . 3v v , l c e p v l _ o c c v s o m c v l _ o c c e g a t l o v y l p p u s t u p t u o7 9 . 23 . 33 6 . 3v i e e t n e r r u c y l p p u s r e w o p 0 6 1a m i o c c t n e r r u c y l p p u s t u p t u o 8a m
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 5 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer t able 5. c rystal c haracteristics t able 4d. lvpecl dc c haracteristics , v cc = v cca = v cco_lvpecl = 3.3v10% or 2.5v5%, ta = -40c to 85c t able 4c. lvcmos / lvttl dc c haracteristics , v cc = v cca = v cco_lvcmos = 3.3v10% or 2.5v5%, ta = -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 e g a t l o v h g i h t u p n i v c c % 0 1 v 3 . 3 =2v c c 3 . 0 +v v c c % 5 v 5 . 2 =7 . 1v c c 3 . 0 +v v m i e g a t l o v m u i d e m t u p n i v v v l i e g a t l o v w o l t u p n i v c c % 0 1 v 3 . 3 =3 . 0 -8 . 0v v c c % 5 v 5 . 2 =3 . 0 -7 . 0v i h i t u p n i t n e r r u c h g i h , r m , 1 l e s , 0 l e s , k l c e o , 2 n , 1 m , 0 m v c c v = n i v 3 6 . 3 = v 5 2 6 . 2 r o 0 5 1a 1 n , 0 n , 2 m v c c v = n i v 3 6 . 3 = v 5 2 6 . 2 r o 5a i m i t u p n i t n e r r u c m u i d e m a i l i t u p n i t n e r r u c w o l , r m , 1 l e s , 0 l e s , k l c e o , 2 n , 1 m , 0 m v c c , v 5 2 6 . 2 r o v 3 6 . 3 = v n i v 0 = 5 -a e o , 1 n , 0 n , 2 m v c c , v 5 2 6 . 2 r o v 3 6 . 3 = v 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 s o m c v l _ o c c v 3 6 . 3 =6 . 2v v s o m c v l _ o c c v 5 2 6 . 2 =8 . 1v 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 s o m c v l _ o c c v 3 6 . 3 = v 5 2 6 . 2 r o 5 . 0v 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 s o m c v l _ o c c , 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 / . " m a r g a i d t i u c r i c t s e t d a o l t u p t u o " 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 o 1 e t o n ; e g a t l o v h g i h t u p t u ov o c c 4 . 1 -v o c c 9 . 0 -v v l o 1 e t o n ; e g a t l o v w o l t u p t u ov o c c 0 . 2 -v o c c 7 . 1 -v v g n i w s g n i w s e g a t l o v t u p t u o k a e p - o t - k a e p 6 . 00 . 1v 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 l c e p v l _ o c c . v 2 - 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 fz h m y c n e u q e r f 4 15 5 . 5 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 5 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 . l a t s y r c t n a n o s e r l e l l a r a p f p 8 1 n a g n i s u d e z i r e t c a r a h c : e t o n
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 6 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer t able 7b. ac c haracteristics , v cc = v cca = v cco_lvcmos, v cco_lvpecl = 2.5v5%, ta = -40c to 85c t able 7a. ac c haracteristics , v cc = v cca = v cco_lvcmos, v cco_lvpecl = 3.3v10%, ta = -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 t u o y c n e u q e r f t u p t u o 9 40 4 6z h m t ) ? ( t i j ; ) m o d n a r ( , r e t t i j e s a h p s m r 1 e t o n ) z h m 0 2 - z h m 5 7 8 . 1 ( z h m 5 2 15 . 0s p f o c v e g n a r k c o l o c v l l p 0 9 40 4 6z h m t r t / f l l a f / e s i r t u p t u o e m i t q n / q % 0 8 o t % 0 2 0 0 20 0 5s p t u o _ f e r0 0 20 0 7s p c d oe l c y c y t u d t u p t u o q n / q5 45 5% t u o _ f e r? z h m 0 5 24 46 5% . e c a f r e t n i l a t s y r c a g n i s u r e t t i j e s a h p : 1 e t o n 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 t u o y c n e u q e r f t u p t u o 9 40 4 6z h m t ) ? ( t i j ; ) m o d n a r ( , r e t t i j e s a h p s m r 1 e t o n ) z h m 0 2 - z h m 5 7 8 . 1 ( z h m 5 2 15 . 0s p f o c v e g n a r k c o l o c v l l p 0 9 40 4 6z h m t r t / f l l a f / e s i r t u p t u o e m i t q n / q % 0 8 o t % 0 2 0 0 20 0 5s p t u o _ f e r0 0 30 0 8s p c d oe l c y c y t u d t u p t u o q n / q5 45 5% t u o _ f e r? z h m 0 5 24 46 5% . e c a f r e t n i l a t s y r c a g n i s u r e t t i j e s a h p : 1 e t o n t able 6. i nput f requency c haracteristics , v cc = v cca = v cco_lvcmos, v cco_lvpecl = 3.3v10%, ta = -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 n i y c n e u q e r f t u p n ik l c 0 = 0 l e s , 1 = 1 l e s4 15 5 . 5 3z h m 0 = 0 l e s , 1 = 1 l e sc d0 5 2z h m
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 7 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer t ypical p hase n oise at 125mh z 125mhz rms phase jitter (random) 1.875mhz to 20mhz = 0.5ps (typical) o ffset f requency (h z ) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 100 1k 10k 100k 1m 10m 100m phase noise result by adding a 10gb ethernet filter to raw data raw phase noise data 10gb ethernet filter ? ? ? dbc hz n oise p ower
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 8 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer p arameter m easurement i nformation 3.3v lvpecl o utput l oad ac t est c ircuit scope qx nqx lvpecl 2v -1.3v0.33v lvcmos o utput d uty c ycle /p ulse w idth /p eriod v ee 3.3v lvcmos o utput l oad ac t est c ircuit scope qx lvcmos 1.6510% -1.65v10% v ee rms p hase j itter phase noise mas k offset frequency f 1 f 2 phase noise plot rms jitter = area under the masked phase noise plot noise power 2.5v lvcmos o utput l oad ac t est c ircuit scope qx nqx lvpecl 2v -0.5v 0.125v v ee 2.5v lvpecl o utput l oad ac t est c ircuit scope qx lvcmos 1.25v5% -1.25v5% v ee v cc, v cca, v cco_l vpecl v cc, v cca, v cco_lvcmos v cc, v cca, v cco_l vpecl v cc, v cca, v cco_lvcmos t period t pw t period odc = x 100% v cco_lvcmos 2 t pw ref_out
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 9 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer t pw t period t pw t period odc = x 100% q lvpecl o utput d uty c ycle /p ulse w idth /p eriod lvpecl o utput r ise /f all t ime clock outputs 20% 80% 80% 20% t r t f v swing nq lvcmos o utput r ise /f all t ime clock outputs 20% 80% 80% 20% t r t f
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 10 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer c rystal i nput i nterface the ICS843001I-22 has been characterized with 18pf paral- lel resonant crystals. the capacitor values shown in figure 2 figure 2. c rystal i npu t i nterface below were determined using a 26.5625mhz 18pf parallel resonant crystal and were chosen to minimize the ppm error. ics84332 xtal_in xtal_out x1 18pf parallel cry stal c2 22p c1 22p ICS843001I-22 a pplication i nformation as in any high speed analog circuitry, the power supply pins are vulnerable to random noise. the ICS843001I-22 provides separate power supplies to isolate any high switching noise from the outputs to the internal pll. v cc , v cca , and v cco_x 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 10 resistor along with a 10f and a .01 f bypass capacitor should be connected to each v cca . p ower s upply f iltering t echniques f igure 1. p ower s upply f iltering 10 v cca 10 f .01 f 3.3v or 2.5v .01 f v cc
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 11 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer t ermination for 3.3v lvpecl o utput v cc - 2v 50 50 rtt z o = 50 z o = 50 fout fin rtt = z o 1 ((v oh + v ol ) / (v cc ? 2)) ? 2 3.3v 125 125 84 84 z o = 50 z o = 50 fout fin the clock layout topology shown below is a typical ter- mination for lvpecl outputs. the two different layouts mentioned are recommended only as guidelines. fout and nfout are low impedance follower outputs that generate ecl/lvpecl compatible outputs. there- fore, terminating resistors (dc current path to ground) or current sources must be used for functionality. these f igure 3b. lvpecl o utput t ermination f igure 3a. lvpecl o utput t ermination outputs are designed to drive 50 transmission lines. matched impedance techniques should be used to maxi- mize operating frequency and minimize signal distor- tion. figures 3a and 3b show two different layouts which are recommended only as guidelines. other suitable clock layouts may exist and it would be recommended that the board designers simulate to guarantee compat- ibility across all printed circuit and clock component pro- cess variations. 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. clk i nput : for applications not requiring the use of the test clock, it can be left floating. though not required, but for additional protection, a 1k resistor can be tied from the clk input to ground. 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. lvpecl o utput all unused lvpecl outputs can be left floating. we recommend that there is no trace attached. both sides of the differential output pair should either be left floating or terminated.
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 12 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer t ermination for 2.5v lvpecl o utput figure 4a and figure 4b show examples of termination for 2.5v lvpecl driver. these terminations are equivalent to ter- minating 50 to v cc - 2v. for v cco = 2.5v, the v cco - 2v is very close to ground level. the r3 in figure 4b can be eliminated and the termination is shown in figure 4c. f igure 4c. 2.5v lvpecl t ermination e xample r2 50 zo = 50 ohm vcco=2.5v r1 50 zo = 50 ohm + - 2.5v 2,5v lvpecl driv er f igure 4b. 2.5v lvpecl d river t ermination e xample vcco=2.5v r1 50 r2 50 zo = 50 ohm r3 18 2,5v lvpecl driv er zo = 50 ohm + - 2.5v f igure 4a. 2.5v lvpecl d river t ermination e xample r2 62.5 2.5v 2,5v lvpecl driv er r3 250 zo = 50 ohm zo = 50 ohm r4 62.5 2.5v + - r1 250 vcco=2.5v
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 13 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer p ower c onsiderations this section provides information on power dissipation and junction temperature for the ICS843001I-22. equations and example calculations are also provided. 1. power dissipation. the total power dissipation for the ICS843001I-22 is the sum of the core power plus the power dissipated in the load(s). the following is the power dissipation for v cc = 3.3v + 5% = 3.465v, which gives worst case results. note: please refer to section 3 for details on calculating power dissipated in the load. ? power (core) max = v cc_max * i ee_max = 3.465v * 160ma = 554.4mw ? power (outputs) max = 30mw/loaded output pair total power _max (3.465v, with all outputs switching) = 554.4mw + 30mw = 584.4mw 2. junction temperature. junction temperature, tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the device. the maximum recommended junction temperature for hiperclocks tm devices is 125c. the equation for tj is as follows: tj = ja * pd_total + t a tj = junction temperature ja = junction-to-ambient thermal resistance pd_total = total device power dissipation (example calculation is in section 1 above) t a = ambient temperature in order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance ja must be used. assuming a moderate air flow of 1 meter per second and a multi-layer board, the appropriate value is 65c/w per table 8 below. therefore, tj for an ambient temperature of 85c with all outputs switching is: 85c + 0.584w * 65c/w = 123c. this is below the limit of 125c. this calculation is only an example. tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow, and the type of board (single layer or multi-layer). t able 8. t hermal r esistance ja for 24- pin tssop, f orced c onvection ja by velocity (meters per second) 0 1 2.5 multi-layer pcb, jedec standard test boards 70c/w 65c/w 62c/w
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 14 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer 3. calculations and equations. the purpose of this section is to derive the power dissipated into the load. lvpecl output driver circuit and termination are shown in figure 5. t o calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination voltage of v cco - 2v. ? for logic high, v out = v oh_max = v cco_max ? 0.9v (v cco_max - v oh_max ) = 0.9v ? for logic low, v out = v ol_max = v cco_max ? 1.7v (v cco_max - v ol_max ) = 1.7v pd_h is power dissipation when the output drives high. pd_l is the power dissipation when the output drives low. pd_h = [(v oh_max ? (v cco_max - 2v))/r l ] * (v cco_max - v oh_max ) = [(2v - (v cco _max - v oh_max )) /r l ] * (v cco_max - v oh_max ) = [(2v - 0.9v)/50 ] * 0.9v = 19.8mw pd_l = [(v ol_max ? (v cco_max - 2v))/r l ] * (v cco_max - v ol_max ) = [(2v - (v cco _max - v ol_max )) /r l ] * (v cco_max - v ol_max ) = [(2v - 1.7v)/50 ] * 1.7v = 10.2mw total power dissipation per output pair = pd_h + pd_l = 30mw f igure 5. lvpecl d river c ircuit and t ermination q1 v out v cco rl 50 v cco - 2v
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 15 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer r eliability i nformation t ransistor c ount the transistor count for ICS843001I-22 is: 3881 t able 9. ja vs . a ir f low t able for 24 l ead tssop ja by velocity (meters per second) 0 1 2.5 multi-layer pcb, jedec standard test boards 70c/w 65c/w 62c/w
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 16 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer p ackage o utline - g s uffix for 24 l ead tssop t able 10. p ackage d imensions reference document: jedec publication 95, mo-153 l o b m y s s r e t e m i l l i m m u m i n i mm u m i x a m n4 2 a- -0 2 . 1 1 a5 0 . 05 1 . 0 2 a0 8 . 05 0 . 1 b9 1 . 00 3 . 0 c9 0 . 00 2 . 0 d0 7 . 70 9 . 7 ec i s a b 0 4 . 6 1 e0 3 . 40 5 . 4 ec i s a b 5 6 . 0 l5 4 . 05 7 . 0 0 8 a a a- -0 1 . 0
843001agi-22 www.icst.com/products/hiperclocks.html rev. a august 1, 2005 17 integrated circuit systems, inc. ICS843001I-22 f emto c locks ? c rystal /lvcmos- to - 3.3v, 2.5v lvpecl f requency s ynthesizer t able 11. 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, patents, 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 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 2 2 - i g a 1 0 0 3 4 8 s c i2 2 i a 1 0 0 3 4 8 s c ip o s s t d a e l 4 2e b u tc 5 8 o t c 0 4 - t 2 2 - i g a 1 0 0 3 4 8 s c i2 2 i a 1 0 0 3 4 8 s c ip o s s t d a e l 4 2l e e r & e p a t 0 0 5 2c 5 8 o t c 0 4 - f l 2 2 - i g a 1 0 0 3 4 8 s c il 2 2 i a 1 0 0 3 4 s c ip o s s t " e e r f - d a e l " d a e l 4 2e b u tc 5 8 o t c 0 4 - t f l 2 2 - i g a 1 0 0 3 4 8 s c il 2 2 i a 1 0 0 3 4 s c ip o s s t " e e r f - d a e l " d a e l 4 2l e e r & e p a t 0 0 5 2c 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 the aforementioned trademarks, hiperclocks and femtoclocks are trademarks of integrated circuit systems, inc. or its subsidiari es in the united states and/or other countries.

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