SY89425

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 reference of 77.76MHz).

The SY89425 operates from a single +5 volt supply, and requires only a simple series RC loop filter for each PLL. Coupling Micrel-Synergy'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.