DESCRIPTION

The SY89429A is a general purpose, synthesized clock source targeting applications that require both serial and parallel interfaces. Its internal VCO will operate over a range of frequencies from 400MHz to 800MHz. The differential PECL output can be confgured to be the VCO frequency divided by 2, 4, 8 or 16. With the output confgured to divide the VCO frequency by 2, and with a 16MHz external quartz crystal used to provide the reference frequency, the output frequency can be specifed in 1MHz steps.

FEATURES

■ Improved jitter performance over SY89429

■ 25MHz to 400MHz differential PECL outputs

■ ±25ps peak-to-peak output jitter

■ Minimal frequency over-shoot

■ Synthesized architecture

■ Serial 3 wire interface

■ Parallel interface for power-on

■ Internal quartz reference oscillator driven by quartz

crystal or PECL source

■ PECL output can operate with either +3.3V or +5V

VCC_OUT power supply

■ External loop flter optimizes performance/cost

■ Applications note (AN-06) for ease of design-ins

■ Available in PLCC and SOIC 28-pin packages

APPLICATIONS

■ Workstations

■ Advanced communications

■ High end consumer

■ High-performance computing

■ RISC CPU clock

■ Graphics pixel clock

■ Test equipment

■ Other high-performance processor-based applications