SY89426 Datasheet | Micrel Semiconductor

Micrel, Inc. SONET OC-12/OC-3 CLOCK SYNTHESIZER Precision Edge® Precision Ed Sg Y8e9®426 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 patible inputs and reference output s SONET pliant jitter performance (≤0.01UI) s Choice of three reference frequencies s Only 395m W (typ) s plies with Bellcore, CCITT and ANSI standards s Single +5 volt power supply s Fully patible 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 pliant 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 patible 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 0.1u F RFCK (TTL) FLTRN CK622P (PECL) CK622N 1000Ω FLTRP SY89426 SEL39 (TTL) SEL78 (TTL) CK155 (PECL) RETRFCK (TTL) RST DISC (TTL) (TTL) 2X 50Ω 622.08MHz CLOCK OUT +3V 50Ω 155.52MHz CLOCK OUT RETIMED REFOUT Precision Edge is a registered trademark of Micrel, Inc. ASSET is a trademark of Micrel,...