Description

The LCK4950 is a PLL-based clock driver device intended for high-performance clock tree designs. The LCK4950 is 3.3 V compatible with output frequencies of up to 180 MHz and output skews of 200 ps. The LCK4950 can accommodate the most demanding tree designs by employing a fully differential PLL design. This minimizes cycle-to-cycle jitter, which is critical when the device is acting as the reference clock for PLLs in today’s microprocessors and ASICs. The device has nine low-skew configurable outputs for support of the clocking needs of the various high-performance microprocessors.

Features

■ Fully integrated phase-locked loop (PLL)

■ Oscillator or crystal reference input

■ Output frequency up to 180 MHz

■ Outputs disable in high impedance

■ Compatible with PowerPC®, Intel®, and highperformance RISC microprocessors

■ TQFP packaging

■ Output frequency configurable

■ ±35 ps typical cycle-to-cycle jitter

■ Pin compatible with the Motorola® MPC950 clock driver