General Description

The ICS9EX21531 provides 15 output clocks for PCIe Gen1/

2/3 applications. The 9EX21531 has 4 selectable SMBus

addresses, and dedicated CKPWRGD/PD# and VDDA pins

for easy board design. A differential clock from a CK410B+

or CK420BQ main clock generator, such as the ICS932S421,

drives the ICS9EX21531. In fanout mode, the 9EX21531

provides outputs up to 166MHz.

Features/Benefits:

• Pin compatible to 9EX21501/ Easy PCIe Gen3

upgrade

• 4 Selectable SMBus Addresses/Mulitple devices can

share the same SMBus Segment

• 8 dedicated and 2 group OE# pins/Hardware control of

the outputs

• PLL or bypass mode/PLL can dejitter incoming clock

• Selectable PLL bandwidth/minimizes jitter peaking in

downstream PLL's

• Spread Spectrum Compatible/tracks spreading input

clock for low EMI

• SMBus Interface/unused outputs can be disabled

• Undriven differential outputs in Power Down mode/

Easy power management