SY89801A

Micrel-Synergy's SY89801A PLL based clock generator provides, in a single chip, all the necessary clocks for Hewlett- Packard's PA-8000 Microprocessor.

Utilizing Micrel-Synergy's advanced PLL technology, the SY89801A accepts a Positive-ECL (PECL) reference clock input at 100MHz-132MHz, and provides precisely aligned, ultra-low-jitter ratios of frequencies necessary for the operation of the processor. In addition, the SY89801A provides the "USYNC" synchronizing signals as required by the PA-8000. The frequency ratios are 1:1, 4:3, 3:2, 5:3 and 2:1.

To facilitate direct interfacing to the PA-8000, the SY89801A operates across +3.3 volt and -1.9 volt supplies. The processor clock (PCLK), runway clock (RCLK) , and USYNC outputs are HSTL-compatible. Additionally, there is a PECL-compatible runway clock output (RCLKLV). The SY89801A requires only a simple external series-RC loop filter.Coupling Micrel-Synergy's advanced PLL technology with our proprietary ASSET bipolar process has produced a Timing Generator IC which meets the stringent requirements of the PA-8000 P, while setting a new standard for performance and flexibility.