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