840031ami www.icst.com/products/hiperclocks.html rev. a february 24, 2005 1 integrated circuit systems, inc. ics840031i f emto c locks ? c rystal - to - lvcmos/lvttl c lock g enerator g eneral d escription the ics840031i is an ieee 1394b clock generator and a member of the hiperclocks tm family of high performance devices from ics. the ics840031i uses a 24.576mhz crystal to synthesize 98.304mhz. the ics840031i has excellent phase jitter performance, from 12khz ? 20mhz integration range. the ics840031i is packaged in a small 8-pin soic, making it ideal for use in systems with limited board space. f eatures ? (1) lvcmos/lvttl output ? crystal oscillator interface designed for a 24.576mhz, 18pf parallel resonant crystal ? output frequency: 98.304mhz (typical) ? vco range: 490mhz to 640mhz ? rms phase jitter @ 98.304mhz, using a 24.576mhz crystal (12khz - 20mhz): 0.75ps (typical) ? rms phase noise at 98.304mhz (typical) offset noise p o w er 100hz .............. -103.3 dbc/hz 1khz .............. -126.2 dbc/hz 10khz .............. -134.2 dbc/hz 100khz .............. -132.9 dbc/hz ? 3.3v core/1.8v output operating supply ? lead-free fully rohs compliant ? -40c to 85c ambient operating temperature hiperclocks? ics ics840031i 8-lead soic 3.90mm x 4.90mm x 1.37mm package body m package top view v dd xtal_out xtal_in v dda 1 2 3 4 v ddo q0 gnd pll_sel 8 7 6 5 b lock d iagram p in a ssignment osc phase detector vco 589.824mhz w/ 24.576mhz ref. m = 24 (fixed) 6 0 1 xtal_in xtal_out pll_sel q0 f requency t able s t u p n i y c n e u q e r f t u p t u o ) z h m ( ) z h m ( y c n e u q e r f l a t s y r c 6 7 5 . 4 24 0 3 . 8 9 (pullup)
840031ami www.icst.com/products/hiperclocks.html rev. a february 24, 2005 2 integrated circuit systems, inc. ics840031i f emto c locks ? c rystal - to - lvcmos/lvttl c lock g enerator t able 2. p in c haracteristics 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 1v d d r e w o p. n i p y l p p u s e r o c , 2 3 , t u o _ l a t x n i _ l a t x t u p n i , t u p n i e h t s i n i _ 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 . t u p t u o e h t s i t u o _ l a t x 4v a d d r e w o p. n i p y l p p u s g o l a n a 5l e s _ l l pt 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 . n i p t c e l e s l l p 6d n gr e w o p. d n u o r g y l p p u s r e w o p 70 qt 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 d e d n e - e l g n i s 8v o d d r e w o p. 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 . 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 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 pv d d v = a d d v , v 5 6 4 . 3 = o d d v 9 8 . 1 =8 1f 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 t u o e c n a d e p m i t u p t u o 0 1 ?
840031ami www.icst.com/products/hiperclocks.html rev. a february 24, 2005 3 integrated circuit systems, inc. ics840031i f emto c locks ? c rystal - to - lvcmos/lvttl c lock g enerator t able 3a. p ower s upply dc c haracteristics , v dd = v dda = 3.3v5%, v ddo = 1.8v5%, 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 o d d e g a t l o v y l p p u s t u p t u o 1 7 . 18 . 19 8 . 1v i d d t n e r r u c y l p p u s r e w o p 5 5a m i a d d t n e r r u c y l p p u s g o l a n a 2 1a m i o d d t n e r r u c y l p p u s t u p t u o 5a m t able 4. c rystal c haracteristics 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 112.7c/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 = 3.3v5%, v ddo = 1.8v5%, 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 i 2v d d 3 . 0 +v v l i e g a t l o v w o l t u p n i 3 . 0 -8 . 0v i h i t n e r r u c h g i h t u p n il e s _ l l pv d d v = n i v 5 6 4 . 3 =5a i l i t n e r r u c w o l t u p n il e s _ l l pv d d v , v 5 6 4 . 3 = 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 5 . 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 4 . 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 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 v 8 . 1 / v 3 . 3 " 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 f1 = l e s _ f7 1 4 . 0 26 7 5 . 4 27 6 6 . 6 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 t able 5. ac c haracteristics , v dd = v dda = 3.3v5%, v ddo = 1.8v5%, 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 7 6 . 1 84 0 3 . 8 97 6 . 6 0 1z 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 4 0 3 . 8 9 = t u o f ) z h m 0 2 o t z h k 2 1 ( 5 7 . 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 22 . 01s n c d oe l c y c y t u d t u p t u o 6 44 5% . 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 : 1 e t o n
840031ami www.icst.com/products/hiperclocks.html rev. a february 24, 2005 4 integrated circuit systems, inc. ics840031i f emto c locks ? c rystal - to - lvcmos/lvttl c lock g enerator t ypical p hase n oise at 98.304mh z 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 10 100 1k 10k 100k 1m 10m 100m 98.304mhz rms phase jitter (random) 12khz to 20mhz = 0.75ps (typical) o ffset f requency (h z ) n oise p ower dbc hz phase noise result by adding a filter to raw data raw phase noise data filter ? ? ?
840031ami www.icst.com/products/hiperclocks.html rev. a february 24, 2005 5 integrated circuit systems, inc. ics840031i f emto c locks ? c rystal - to - lvcmos/lvttl c lock g enerator p arameter m easurement i nformation o utput d uty c ycle /p ulse w idth /p eriod o utput r ise /f all t ime 3.3v/1.8v o utput l oad ac t est c ircuit scope qx lvcmos 2.40.9v -0.9v5% pulse width t period t pw t period odc = v dd 2 q0 gnd v dd , v dda 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 clock outputs 20% 80% 80% 20% t r t f v ddo 0.9v5%
840031ami www.icst.com/products/hiperclocks.html rev. a february 24, 2005 6 integrated circuit systems, inc. ics840031i f emto c locks ? c rystal - to - lvcmos/lvttl c lock g enerator a pplication i nformation figure 2. c rystal i npu t i nterface c rystal i nput i nterface the ics840031i has been characterized with 18pf parallel resonant crystals. the capacitor values, c1 and c2, shown in figure 2 below were determined using a 24.576mhz, 18pf parallel resonant crystal and were chosen to minimize the ppm error. the optimum c1 and c2 values can be slightly adjusted for different board layouts. p ower s upply f iltering t echniques as in any high speed analog circuitry, the power supply pins are vulnerable to random noise. the ics840031i 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 10 f and a .01 f bypass capacitor should be connected to each v dda pin. f igure 1. p ower s upply f iltering 10 ? v dda 10 f .01 f 3.3v .01 f v dd c1 33p x1 18pf parallel crystal c2 22p xtal_out xtal_in
840031ami www.icst.com/products/hiperclocks.html rev. a february 24, 2005 7 integrated circuit systems, inc. ics840031i f emto c locks ? c rystal - to - lvcmos/lvttl c lock g enerator r eliability i nformation t ransistor c ount the transistor count for ics840031i is: 1787 t able 6. ja vs . a ir f low t able for 8 l ead soic f igure 3. ics840031i a pplication s chematic e xample a pplication s chematic e xample figure 3 shows a schematic example of the ics840031i. in this example, a series termination, one of lvcmos termination ap- proaches, is shown. additional lvcmos termination approaches are shown in the lvcmos termination application note. in this example, an 18pf parallel resonant crystal is used. the c1=22pf and c2=33pf are approximate values for frequency accuracy. the c1 and c2 may be slightly adjusted for optimizing frequency accuracy. 0 200 500 single-layer pcb, jedec standard test boards 153.3c/w 128.5c/w 115.5c/w multi-layer pcb, jedec standard test boards 112.7c/w 103.3c/w 97.1c/w note: most modern pcb designs use multi-layered boards. the data in the second row pertains to most designs. ja by velocity (linear feet per minute) c6 0.1u c4 0.1u vdd=3.3v vdd x1 cl=18pf r2 10 vd d o=1 .8 v r1 1k r3 40 vdda vdd c2 33pf c5 0.1u vdd zo = 50 ohm u1 ics840031i 1 2 3 4 8 7 6 5 vdd xtal_out xtal_in vdda vddo q0 gnd pll_sel c3 10uf c1 22pf vddo lvcmos
840031ami www.icst.com/products/hiperclocks.html rev. a february 24, 2005 8 integrated circuit systems, inc. ics840031i f emto c locks ? c rystal - to - lvcmos/lvttl c lock g enerator t able 7. p ackage d imensions p ackage o utline - m s uffix for 8 l ead soic reference document: jedec publication 95, ms-012 l o b m y s s r e t e m i l l i m n u m i n i mm u m i x a m n8 a5 3 . 15 7 . 1 1 a0 1 . 05 2 . 0 b3 3 . 01 5 . 0 c9 1 . 05 2 . 0 d0 8 . 40 0 . 5 e0 8 . 30 0 . 4 ec i s a b 7 2 . 1 h0 8 . 50 2 . 6 h5 2 . 00 5 . 0 l0 4 . 07 2 . 1 0 8
840031ami www.icst.com/products/hiperclocks.html rev. a february 24, 2005 9 integrated circuit systems, inc. ics840031i f emto c locks ? c rystal - to - lvcmos/lvttl c lock g enerator 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 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 femtoclocks? are a trademark of integrated circuit systems, inc. or its s ubsidiaries 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 pt n u o ce r u t a r e p m e t i m a 1 3 0 0 4 8 s c ii a 1 3 0 0 4 8c i o s d a e l 8e b u tc 5 8 o t c 0 4 - t i m a 1 3 0 0 4 8 s c ii a 1 3 0 0 4 8c i o s d a e l 8l e e r & e p a t 0 0 5 2c 5 8 o t c 0 4 - f l i m a 1 3 0 0 4 8 s c il i a 1 3 0 0 4c i o s " e e r f - d a e l " d a e l 8e b u tc 5 8 o t c 0 4 - t f l i m a 1 3 0 0 4 8 s c il i a 1 3 0 0 4c i o s " e e r f - d a e l " d a e l 8l e e r & e p a t 0 0 5 2c 5 8 o t c 0 4 -
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