The Renesas Electronics zero delay buffer supports PCIe Gen1 and Gen2 clocking requirements. The is driven by a differential SRC output pair from an IDT compliant main clock generator. It attenuates jitter on the input clock and has a selectable PLL bandwidth to maximize performance in systems with or without Spread spectrum clocking. An SMBus interface allows control of the PLL bandwidth and bypass options, while 2 clock request pins make the suitable for Express card applications.

Selectable pll bandwidth minimizes jitter peaking in downstream plls
Spread spectrum compatible tracks spreading input clock for low emi
Smbus interface unused outputs can be disabled