SI53340-B-GMR

SI53340‑B‑GMR is Silicon Labs’ dual-output, programmable clock generator (Any-Output family). It takes a fixed reference clock (crystal or external oscillator) and uses a PLL-based synthesizer to produce two user-defined clock outputs with low jitter and a defined phase relationship. It supports multiple output formats (LVDS, LVPECL, CMOS) and adjustable duty cycle, with either fractional-N or integer-N synthesis to match system frequencies. Features often include jitter attenuation, optional spread-spectrum clocking, programmable drive strength, and power-down/reset options. Configuration is via an I2C-like interface (SCL/SDA) with registers to set frequencies, formats, and other options. The -B-GMR suffix denotes the device grade/packaging (commercial, RoHS-compliant) suitable for mass production. Typical applications include clock distribution for FPGAs, processors, memory interfaces, and telecom/data communications systems.

- Pin count: 16 pins (QFN/LQFP package variant, SI53340-B-GMR).
- Function: Four-output, programmable clock generator/PLL device. Derives multiple low-jitter clock signals from a reference, controllable via I2C/SPI (frequency, drive, and output type configurable).

- Manufacturer: Silicon Labs (Silicon Laboratories, Inc.)
- What kind of company: A fabless semiconductor company that designs and sells mixed-signal/analog and digital ICs, including timing/clock generation devices, wireless ICs, sensors, and related products; manufacturing is outsourced to third-party foundries.

SI53340-B-GMR is a 4-output, programmable clock generator/distributor. Common application areas:
- FPGA/SoC timing: reference clocks, clock distribution, and multi-domain synchronization
- High-speed serial interfaces: jitter cleaning for PCIe, SATA, USB, Ethernet
- Multi-domain clock translation and synchronization across different clock domains
- Backplane, telecom, and datacom timing networks requiring low jitter
- Memory interface timing (DDR/LPDDR) and related data-path clocks
- Test/measurement equipment and reference clock sources
These use cases benefit from low jitter, freedom to set multiple output frequencies, and flexible input/output options.

QFN-16 package (4×4 mm), RoHS-compliant.