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SY89425

Micrel Semiconductor
Part Number SY89425
Manufacturer Micrel Semiconductor
Description DUAL SONET OC-12 CLOCK SYNTHESIZER
Published Sep 24, 2005
Detailed Description DUAL SONET OC-12 CLOCK SYNTHESIZER FEATURES s Two independently-powered 622.08MHz clock sources one chip s Differential ...
Datasheet PDF File SY89425 PDF File

SY89425
SY89425

Overview
DUAL SONET OC-12 CLOCK SYNTHESIZER FEATURES s Two independently-powered 622.
08MHz clock sources one chip s Differential PECL outputs s TTL/CMOS compatible inputs s SONET compliant jitter performance (≤0.
01UI) s Choice of three reference frequencies for each PLL s Only 395mW per PLL (typ) s Complies with Bellcore, CCITT and ANSI standards s Single +5 volt power supply s Fully compatible with industry standard 10KH I/O levels s Available in 28-pin PLCC package ClockWorks™ SY89425 DESCRIPTION Micrel-Synergy's SY89425 Dual Phase Locked Loop (PLL) consists of two totally separate, SONET compliant 622.
08MHz clock generators on one chip.
The user may select to power both PLLs or PLL A only.
Each PLL produces a low-jitter OC-12/STS-12 clock rate from an input reference clock of 38.
88, 51.
84, or 77.
76MHz.
When using both PLLs, it is not necessary that they share a common reference clock (e.
g.
, PLL A may operate from an STS-1 reference of 51.
84MHz, while PLL B operates from an OC-3/STS-3 refer...


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