SY89426

Micrel, Inc. SONET OC-12/OC-3 CLOCK SYNTHESIZER Precision Edge® Precision EdSgY8e9®426 SY89426 FEATURES s Single chip source for 622.08MHz and 155.52MHz clocks s 622.08MHz output is differential PECL, 155.52MHz output is single-ended PECL s TTL/CMOS compatible inputs and reference output s SONET compliant jitter performance (≤0.01UI) s Choice of three reference frequencies s Only 395mW (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 Precision Edge® DESCRIPTION Micrel's SY89426 Multi-Output Phase Locked Loop (PLL) is a SONET compliant clock generator providing 622.08MHz, 155.52MHz and retimed reference clock outputs. The PLL produces low jitter OC-12/STS-12 and OC-3/STS-3 rate clocks from an input reference clock of 38.88, 51.84, or 77.76MHz. Additionally, the input reference clock is retimed and provided as a TTL/CMOS compatible output, which may be disabled to minimize switching noise. The SY89426 operates from a single +5 volt supply, and requires only a simple series RC loop filter. Coupling Micrel's advanced PLL technology with our proprietary ASSET™ bipolar process has produced a clock generator IC which exceeds applicable Bellcore and ANSI specifications, while setting a new standard for performance and flexibility. TYPICAL APPLICATION +5V +5V +3V VCC VCCO CLOCK IN 0.1uF RFCK (TTL) FLTRN CK622P (PECL) CK622N 1000Ω FLTRP SY89426...