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844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 1 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer g eneral d escription the ics844002i-01 is a 2 output lvds synthesizer optimized to generate ethernet reference clock frequencies and is a mem- ber of the hiperclocks tm family of high performance clock solutions from ics. using a 25mhz, 18pf parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (f_sel[1:0]): 156.25mhz, 125mhz and 62.5mhz. the ics844002i-01 uses ics? 3 rd generation low phase noise vco technology and can achieve <1ps typical rms phase jitter, easily meeting ethernet jitter requirements. the ics844002i-01 is packaged in a small 20-pin tssop package. f eatures ? two lvds outputs ? selectable crystal oscillator interface or lvcmos/lvttl single-ended input ? supports the following output frequencies: 156.25mhz, 125mhz, 62.5mhz ? vco range: 560mhz - 680mhz ? rms phase jitter @ 156.25mhz, using a 25mhz crystal (1.875mhz - 20mhz): 0.41ps (typical) ? full 2.5v supply mode ? -40c to 85c ambient operating temperature ? available in both, standard and rohs/lead-free compliant packages hiperclocks? ic s 11 0 1 0 phase detector vco 625mhz (w/25mhz reference) m = 25 (fixed) f_sel[1:0] 0 0 4 0 1 5 1 0 10 1 1 not used 2 osc b lock d iagram f requency s elect f unction t able f_sel[1:0] npll_sel ref_clk xtal_in xtal_out nxtal_sel mr q0 nq0 q1 nq1 pulldown pulldown 25mhz pulldown pulldown pulldown ics844002i-01 20-lead tssop 6.5mm x 4.4mm x 0.92mm package body g package to p v i e w nc v ddo q0 nq0 mr npll_sel nc v dda f_sel0 v dd 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 v ddo q1 nq1 gnd v dd nxtal_sel ref_clk xtal_in xtal_out f_sel1 p in a ssignment ) z h m ( y c n e u q e r f t u p t u o ) e c n e r e f e r z h m 5 2 ( 1 l e s _ f0 l e s _ f r e d i v i d m e u l a v r e d i v i d n e u l a v 00 5 24 5 2 . 6 5 1 01 5 25 5 2 1 10 5 20 15 . 2 6 11 d e s u t o nd e s u t o n
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 2 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer t able 1. p in d escriptions 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 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 e b m u ne m a ne p y tn o i t p i r c s e d 7 , 1c nd e s u n u. t c e n n o c o n 0 2 , 2v o d d r e w o p. s n i p y l p p u s t u p t u o 4 , 30 q n , 0 qt u p u o. s l e v e l e c a f r e t n i s d v l . r i a p t u p t u o l a i t n e r e f f i d 5r 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 x q n s 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 x q s 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 6l e s _ l l p nt u p n in w o d l l u p . s r e d i v i d e h t o t t u p n i s a k l c _ f e r d n a l l p e h t n e e w t e b s t c e l e s e h t s t c e l e s e d , h g i h n e h w . ) e l b a n e l l p ( l l p s t c e l e s , w o l 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 . ) s s a p y b l l p ( k c o l c e c n e r e f e r 8v a d d r e w o p. n i p y l p p u s g o l a n a 1 1 , 9 , 0 l e s _ f 1 l e s _ f t 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 . s n i p t c e l e s y c n e u q e r f 6 1 , 0 1v d d r e w o p. n i p y l p p u s e r o c 3 1 , 2 1 , t u o _ l a t x n i _ l a t x t u p n i , t u p t u o e h t s i 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 n i _ l a t x 4 1k l c _ f e rt 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 5 1l e s _ l a t x nt u p n in w o d l l u p e c n e r e f e r l l p e h t e h t s a s t u p n i k l c _ f e r r o l a t s y r c n e e w t e b s t c e l e s . h g i h n e h w k l c _ f e r s t c e l e s . w o l 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 . 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 7 1d n gr e w o p. d n u o r g y l p p u s r e w o p 9 1 , 8 11 q , 1 q nt u p t u o. s l e v e l e c a f r e t n i s d v l . r i a p t u p t u o l a i t n e r e f f i d : e t o n 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 s r e f e r
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 3 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer a bsolute m aximum r atings supply voltage, v dd 4.6v inputs, v i -0.5v to v dd + 0.5v outputs, i o continuous current 10ma surge current 15ma package thermal impedance, ja 73.2c/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 3b. lvcmos / lvttl dc c haracteristics , v dd = v dda = v ddo = 2.5v5%, t a = -40c to 85c t able 3a. p ower s upply dc c haracteristics , v dd = v dda = v ddo = 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 e g a t l o v h g i h t u p n iv d d v 5 . 2 =7 . 1v d d 3 . 0 +v v l i e g a t l o v w o l t u p n iv d d 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 , k l c _ f e r , 1 l e s _ f , 0 l e s _ f l e s _ l a t x n , l e s _ l l p n v d d v = n i v 5 2 6 . 2 =0 5 1a i l i t u p n i t n e r r u c w o l , r m , k l c _ f e r , 1 l e s _ f , 0 l e s _ f l e s _ l a t x n , l e s _ l l p n v d d v , v 5 2 6 . 2 = n i v 0 =0 5 1 -a 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 7 3 . 25 . 25 2 6 . 2v v a d d e g a t l o v y l p p u s g o l a n a 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 r e w o p 5 8a m i a d d t n e r r u c y l p p u s g o l a n a 9a m i o d d t n e r r u c y l p p u s t u p t u o 0 7a m t able 3c. lvds dc c haracteristics , v dd = v dda = v ddo = 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 o e g a t l o v t u p t u o l a i t n e r e f f i d 0 4 20 5 5v m v d o v d o e g n a h c e d u t i n g a m 0 4v m v s o e g a t l o v t e s f f o 7 . 01 . 15 . 1v v s o v s o e g n a h c e d u t i n g a m 0 5v m
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 4 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer t able 4. c rystal c haracteristics 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 4 . 2 25 22 . 7 2z 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 t able 5. ac c haracteristics , v dd = v dda = v ddo = 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 t u o y c n e u q e r f t u p t u o 0 0 = ] 0 : 1 [ l e s _ f0 4 10 7 1z h m 1 0 = ] 0 : 1 [ l e s _ f2 1 16 3 1z h m 0 1 = ] 0 : 1 [ l e s _ f6 58 6z h m t ) o ( k s2 , 1 e t o n ; w e k s t u p t u o 50 2s p t ) ? ( t i j ; ) m o d n a r ( r e t t i j e s a h p s m r 3 e t o n ) z h m 0 2 - z h m 5 7 8 . 1 ( , z h m 5 2 . 6 5 11 4 . 0s p ) z h m 0 2 - z h m 5 7 8 . 1 ( , z h m 5 2 14 4 . 0s p ) z h m 0 2 - z h m 5 7 8 . 1 ( , z h m 5 . 2 67 4 . 0s p 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 5 5s p c d oe l c y c y t u d t u p t u o 8 42 5% . 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 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 : 1 e t o n v t a d e r u s a e m o d d . 2 / . 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 : 2 e t o n . t o l p e s i o n e s a h p e h t o t r e f e r e s a e l p : 3 e t o n
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 5 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer t ypical p hase n oise at 156.25mh z 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 156.25mhz rms phase jitter (random) 1.875mhz to 20mhz = 0.41ps (typical) o ffset f requency (h z ) 1k 10k 100k 1m 10m 100m ? ? ? dbc hz n oise p ower ethernet filter raw phase noise data phase noise result by adding ethernet filter to raw data
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 6 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer p arameter m easurement i nformation o utput d uty c ycle /p ulse w idth /p eriod rms p hase j itter 2.5v c ore /2.5v o utput l oad ac t est c ircuit t sk(o) qy qx nqy nqx phase noise mas k offset frequency f 1 f 2 phase noise plot rms jitter = area under the masked phase noise plot noise power o ffset v oltage s etup t pw t period t pw t period odc = x 100% q0, q1 nq0, nq1 p ropagation d elay o utput s kew scope qx nqx lv d s 2.5v5% power supply +? float gnd v dd, v ddo v dda clock outputs 20% 80% 80% 20% t r t f v sw i n g d ifferential o utput v oltage s etup ? ? ? 100 out out lvds dc input v od / v od v dd out out lv d s dc input ? ? ? v os / v os v dd
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 7 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer c rystal i nput i nterface the ics844002i-01 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 25mhz, 18pf parallel reso- nant crystal and were chosen to minimize the ppm error. a pplication i nformation as in any high speed analog circuitry, the power supply pins are vulnerable to random noise. the ics844002i-01 provides separate power supplies to isolate any high switching noise from the outputs to the internal pll. v dd , v dda , and v ddo 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 dda . p ower s upply f iltering t echniques f igure 1. p ower s upply f iltering 10 v dda 10 f .01 f 2.5v .01 f v dd c1 22p x1 18pf parallel crystal c2 22p xtal_out xtal_in
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 8 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer 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 lvds all unused lvds output pairs can be either left floating or terminated with 100 across. if they are left floating, we recommend that there is no trace attached. transmission line environment. for buffer with multiple ldvs driver, it is recommended to terminate the unused outputs. 2.5v lvds d river t ermination figure 3 shows a typical termination for lvds driver in characteristic impedance of 100 differential (50 single) f igure 3. t ypical lvds d river t ermination 2.5v 100 ohm differential transmission line 2.5v lvds_driv er r1 100 + - 100 differential transmission line
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 9 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer p ower c onsiderations this section provides information on power dissipation and junction temperature for the ics844002i-01. equations and example calculations are also provided. 1. power dissipation. the total power dissipation for the ics844002i-01 is the sum of the core power plus the power dissipated in the load(s). the following is the power dissipation for v dd = 2.5v + 5% = 2.625v, which gives worst case results. power (core) max = v dd_max * i dd_max = 2.625v * 85ma = 223mw power (outputs) max = v ddo_max * i ddo_max = 2.625v * 70ma = 184mw total power _max = 223mw + 184mw = 407mw 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 q 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 200 linear feet per minute and a multi-layer board, the appropriate value is 66.6c/w per table 6 below. therefore, tj for an ambient temperature of 85c with all outputs switching is: 85c + 0.407w * 66.6c/w = 112c. 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 6. t hermal r esistance ja for 20-p in tssop, f orced c onvection ja by velocity (meters per second) 0 200 500 single-layer pcb, jedec standard test boards 114.5c/w 98.0c/w 88.0c/w multi-layer pcb, jedec standard test boards 73.2c/w 66.6c/w 63.5c/w note: most modern pcb designs use multi-layered boards. the data in the second row pertains to most designs.
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 10 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer r eliability i nformation t ransistor c ount the transistor count for ics844002i-01 is: 2914 t able 7. ja vs . a ir f low t able for 20 l ead tssop ja by velocity (meters per second) 0 200 500 single-layer pcb, jedec standard test boards 114.5c/w 98.0c/w 88.0c/w multi-layer pcb, jedec standard test boards 73. 2c/w 66.6c/w 63.5c/w note: most modern pcb designs use multi-layered boards. the data in the second row pertains to most designs.
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 11 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer p ackage o utline - g s uffix for 20 l ead tssop t able 8. p ackage d imensions l o b m y s s r e t e m i l l i m n i mx a m n0 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 4 . 60 6 . 6 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 reference document: jedec publication 95, mo-153
844002agi-01 www.icst.com/products/hiperclocks.html rev. a january 5, 2006 12 integrated circuit systems, inc. ics844002i-01 f emto c locks ? c rystal - to - lvds f requency s ynthesizer t able 9. 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 extr aordinary 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. the aforementioned trademarks, hiperclocks and f emto c locks are trademarks of integrated circuit systems, inc. or its subsidiaries in the united states and/or other countries. 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 1 0 - i g a 2 0 0 4 4 8 s c i1 0 i a 2 0 0 4 4 s c ip o s s t d a e l 0 2e b u tc 5 8 o t c 0 4 - t 1 0 - i g a 2 0 0 4 4 8 s c i1 0 i a 2 0 0 4 4 s c ip o s s t d a e l 0 2l e e r & e p a t 0 0 5 2c 5 8 o t c 0 4 - f l 1 0 - i g a 2 0 0 4 4 8 s c il 1 0 i a 2 0 0 4 s c ip o s s t " e e r f - d a e l " d a e l 0 2e b u tc 5 8 o t c 0 4 - t f l 1 0 - i g a 2 0 0 4 4 8 s c il 1 0 i a 2 0 0 4 s c ip o s s t " e e r f - d a e l " d a e l 0 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

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