The Renesas Electronics RC22504A frequency synthesizer is a small, low-power timing component designed to be placed immediately adjacent to a PHY, switch, ASIC or FPGA that requires several reference clocks with jitter performance less than 100fs (max). It can act as a frequency synthesizer to locally generate the reference clock or as a DCO for frequency margining or OTN clock applications.

Jitter as low as 64 fs RMS maximum (10Hz to 20MHz)
Programmable status output
Supports up to 1MHz I2C or up to 20MHz SPI serial processor port
Can configure itself automatically after reset via internal customer-definable One-Time Programmable (OTP) memory with up to four different configurations
4 x 4 mm 24-QFN package
4 differential / 8 LVCMOS outputs
PLL core consists of fractional-feedback Analog PLL (APLL)