DESCRIPTION

The SY89423V device consists of two identical, low

jitter, digital Phase Locked Loops based on Micrel-Synergys differential PLL technology. Each PLL is capable of operating in the 30MHz to 560MHz reference input frequency range, and is independent of the other, and is configurable separately. The PLLs can be configured to be matched in all regards, or can be configured so that PLLB is used as a frequency doubler, while PLLA is used to regenerate the undoubled frequency. Each PLL is capable of operating up to 2000MHz with the HFIN input and an external VCO.

FEATURES

■ 3.3V and 5V power supply options

■ 1.12GHz maximum VCO frequency

■ 30MHz to 560MHz reference input operating frequency

■ External 2.0GHz VCO capability

■ Frequency doubler mode

■ Low jitter differential design

■ PECL differential outputs

■ External loop filter optimizes performance/cost

■ Available in 44-pin PLCC package

APPLICATIONS

■ Workstations

■ Advanced communications

■ High-performance computing