77.76mhz, lvcmos/lvttl oscillator replacement ics840i-77 idt ? / ics ? lvcmos oscillator replacement 1 ics840agi-77 rev a december 7, 2006 g eneral d escription the ics840i-77 is a sonet oscillator replace- ment and a member of the hiperclocks tm family of high performance devices from idt. the ics840i-77 uses a 19.44mhz crystal to synthesize 77.76mhz. the ics840i-77 has excellent jitter performance. the ics840i-77 is packaged in a small 8-pin tssop, making it ideal for use in systems with limited board space. f eatures ? one lvcmos/lvttl output, 15 ? output impedence ? crystal oscillator interface designed for 19.44mhz, 18pf parallel resonant crystal ? output frequency: 77.76mhz ? random jitter: 3ps (typical) ? deterministic jitter: 0.1ps (typical) ? 3.3v operating supply ? -40c to 85c ambient operating temperature ? available in both standard (rohs 5) and lead-free (rohs 6) packages hiperclocks? ic s ics840i-77 8-lead tssop 4.40mm x 3.0mm x 0.925mm package body g package top view ics840i-77 8-lead soic 3.90mm x 4.92mm x 1.37mm body package m package top view 1 2 3 4 8 7 6 5 b lock d iagram p in a ssignment clock synthesizer xtal_in xtal_out oe q0 pullup 19.44mhz 77.76mhz q1 v dd xtal_out xtal_in oe q1 q0 v ddo gnd
idt ? / ics ? lvcmos oscillator replacement 2 ics840agi-77 rev a december 7, 2006 ics840i-77 77.76mhz, lvcmos/lvttl oscillator replacement t able 2. p in c haracteristics t able 1. p in d escriptions 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 t u o e c n a d e p m i t u p t u o 5 1 ? t able 3. c ontrol f unction t able s t u p n i l o r t n o ct u p t u o e o1 q , 0 q 0z - i h 1e v i t c a 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 r e w o p 3 , 2 , 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 4e ot u p n ip u l l u p , w o l n e h w . 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 . n i p e l b a n e 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 . e t a t s z i h o t s t u p t u o s e c r o f 5d n gr e w o p. d n u o r g y l p p u s r e w o p 6v o d d r e w o p. n i p y l p p u s t u p t u o 8 , 71 q , 0 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 . s t u p t u o k c o l c d e d n e - e l g n i s 5 1 ? . e c n e d e p m i 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
idt ? / ics ? lvcmos oscillator replacement 3 ics840agi-77 rev a december 7, 2006 ics840i-77 77.76mhz, lvcmos/lvttl oscillator replacement t able 4a. p ower s upply dc c haracteristics , v dd = v ddo = 3.3v0.3v, t a = -40c to 85c t able 5. 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 8 lead tssop 101.7c/w (0 mps) 8 lead soic 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 op- eration 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 ex- tended periods may affect product reliability. t able 4b. lvcmos/lvttl dc c haracteristics , v dd = v ddo = 3.3v0.3v, t a = -40c to 85c 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 4 . 9 1z 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 4 ? 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 0 0 3w 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 r e w o p 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 r e w o pv = e o d d ) d e l b a n e t u p t u o (0 8a 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 2a 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 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 iv d d v = n i v 6 . 3 =5a i l i t n e r r u c w o l t u p n iv d d v , v 6 . 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 6 . 2v v l o 1 e t o n ; e g a t l o v w o l t u p t u 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 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 v 3 . 3 "
idt ? / ics ? lvcmos oscillator replacement 4 ics840agi-77 rev a december 7, 2006 ics840i-77 77.76mhz, lvcmos/lvttl oscillator replacement t able 6. ac c haracteristics , v dd = v ddo = 3.3v0.3v, t a = -40c to 85c l o b m y s 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 f t u o y c n e u q e r f t u p t u o 6 7 . 7 7z h m t j d 1 e t o n ; r e t t i j c i t s i n i m r e t e d 1 . 0s p t j r 1 e t o n ; r e t t i j m o d n a r 3s p t s m r ( n o i t u b i r t s i d l a t o t f o s m r ; ) 1 e t o n 3s p t p - p 1 e t o n ; r e t t i j k a e p - o t - k a e p 6 2s p t c s o e m i t p u t r a t s n o i t a l l i c s o e g a t l o v g n i t a r e p o m u m i n i m t a e m i t s 0 e b o t 0 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 0 40 5 8s p c d oe l c y c y t u d t u p t u o 8 42 5% . 0 0 0 3 - a i s t s e r c e v a w g n i s u d e r u s a e m : 1 e t o n
idt ? / ics ? lvcmos oscillator replacement 5 ics840agi-77 rev a december 7, 2006 ics840i-77 77.76mhz, lvcmos/lvttl oscillator replacement p arameter m easurement i nformation o utput r ise /f all t ime 3.3v o utput l oad ac t est c ircuit scope qx lvcmos gnd 1.65v 0.15v -1.65v 0.15v clock outputs 20% 80% 80% 20% t r t f q0, q1 v dd, v ddo o utput d uty c ycle /p ulse w idth /p eriod t period t pw t period odc = v ddo 2 x 100% t pw
idt ? / ics ? lvcmos oscillator replacement 6 ics840agi-77 rev a december 7, 2006 ics840i-77 77.76mhz, lvcmos/lvttl oscillator replacement a pplication i nformation f igure 1. c rystal i npu t i nterface c rystal i nput i nterface the ics840i-77 has been characterized with 18pf parallel resonant crystals. the capacitor values, c1 and c2, shown in figure 1 below were determined using a 19.44mhz, 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. x1 18pf parallel cry stal c1 12p xtal_out xtal_in c2 12p o utputs : lvcmos o utput : all unused lvcmos output can be left floating. we recommend that there is no trace attached. r ecommendations for u nused o utput p ins
idt ? / ics ? lvcmos oscillator replacement 7 ics840agi-77 rev a december 7, 2006 ics840i-77 77.76mhz, lvcmos/lvttl oscillator replacement r eliability i nformation t ransistor c ount the transistor count for ics840i-77 is: 2423 t able 7a. ja vs . a ir f low t able for 8 l ead tssop ja by velocity (meters per second) 0 1 2.5 multi-layer pcb, jedec standard test boards 101.7c/w 90.5c/w 89.8c/w t able 7b. ja vs . a ir f low t able 8 l ead soic ja by velocity (linear feet per minute) 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.
idt ? / ics ? lvcmos oscillator replacement 8 ics840agi-77 rev a december 7, 2006 ics840i-77 77.76mhz, lvcmos/lvttl oscillator replacement p ackage o utline - g s uffix for 8 l ead tssop t able 8a. 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 n8 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 9 . 20 1 . 3 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 p ackage o utline - m s uffix for 8 l ead soic t able 8b. p ackage d imensions reference document: jedec publication 95, ms-012 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 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
idt ? / ics ? lvcmos oscillator replacement 9 ics840agi-77 rev a december 7, 2006 ics840i-77 77.76mhz, lvcmos/lvttl oscillator replacement while the information presented herein has been checked for both accuracy and reliability, integrated device technology, incorp orated (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 l icenses 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 r equirements 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 in life support devices or critical medical instruments. t able 9. o rdering i nformation 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 7 7 - i g a 0 4 8 s c i7 7 i a 0p o s s t d a e l 8e b u tc 5 8 o t c 0 4 - t 7 7 - i g a 0 4 8 s c i7 7 i a 0p o s s t 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 7 7 - i g a 0 4 8 s c id b tp o s s t " 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 7 7 - i g a 0 4 8 s c id b tp o s s t " 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 - 7 7 - i m a 0 4 8 s c i7 7 i m a 0 4 8c i o s d a e l 8e b u tc 5 8 o t c 0 4 - t 7 7 - i m a 0 4 8 s c i7 7 i m a 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 7 7 - i m a 0 4 8 s c id b tc 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 7 7 - i m a 0 4 8 s c id b tc 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 - . 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
innovate with idt and accelerate your future networks. contact: www.idt.com for sales 800-345-7015 408-284-8200 fax: 408-284-2775 for tech support netcom@idt.com 480-763-2056 corporate headquarters integrated device t echnology, inc. 6024 silver creek valley road san jose, ca 95138 united states 800 345 7015 +408 284 8200 (outside u.s.) asia pacific and japan integrated device technology singapore (1997) pte. ltd. reg. no. 199707558g 435 orchard road #20-03 wisma atria singapore 238877 +65 6 887 5505 europe idt europe, limited 321 kingston road leatherhead, surrey kt22 7tu england +44 (0) 1372 363 339 fax: +44 (0) 1372 378851 ? 2006 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 br ands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. printed in usa ics840i-77 77.76mhz, lvcmos/lvttl oscillator replacement
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