The RC21xxxB (RC21012B and RC21008B) is a member of Renesas's VersaClock® 7 programmable clock generator family. It is intended for high-performance computers, data-communications, and industrial applications, designed to be placed immediately adjacent to a PHY, switch, ASIC or FPGA that requires several reference clocks with jitter performance 150fs typical RMS.

Up to 27 configurations reusable across multiple designs may be stored in on-chip One-Time Programmable (OTP) memory or external I2C EEPROM. Redundant input available for backup and used as reference clock where needed.


  • 1.8V/2.5V/3.3V flexible power rails
  • Typical 150fs RMS 12k-20MHz phase jitter​
  • 5/8/12 outputs with integrated crystal options
  • 1kHz to 650MHz LVDS/LP-HCSL outputs
  • 1kHz to 200MHz LVCMOS outputs
  • Programmable hardware configuration select-pins
  • PCIe Gen5/6 ready
  • Space saving packages 4 x 4mm, 5x5 mm, 6x6 mm
  • Integrated crystal option for space saving and BOM optimization




  • High-performance computing
  • Data center accelerators
  • Switches / routers
  • Synchronous Ethernet
  • Industrial


Design & Development

Software & Tools

Software & Tools

Software title
Software type
Renesas IC Toolbox (RICBox)
The Renesas IC Toolbox (RICBox) software platform enables customers to configure Renesas devices on evaluation kits when attached to the computer running the software.
Software Package Renesas
1 item

Software Downloads

Type Title Date
PCB Design Files ZIP 18 KB
PCB Design Files ZIP 657 KB
2 items

Boards & Kits

Boards & Kits


VersaClock®7 Evaluation Board Demonstration

Learn more about how to configure the VersaClock®7 evaluation board using the supporting RICBox software. VersaClock®7 devices achieve any frequency-in, any frequency-out for high speed SerDes used in switches routers, accelerator cards, and server applications.