SI53322-B-GM

SI53322-B-GM is Silicon Labs’ dual-output programmable clock generator (Si5332 family). It derives two user-defined clocks from a single reference using programmable PLLs/dividers, controlled over I2C. Features include fractional-N capability, jitter cleaning, spread-spectrum, and holdover, with outputs configurable for multiple formats (e.g., LVDS/LVPECL/LVCMOS) as needed. Typical supply is 1.8–3.3 V; the -GM suffix denotes a specific RoHS-compliant package/grade (e.g., QFN). Common applications are FPGA/SoC clocks, SERDES, memory interfaces, PCIe/USB PHY clocks, and other systems needing clean, flexible timing. To use: provide a reference clock, power rails, and program the desired output frequencies/formats via the I2C register map; verify performance with an oscilloscope or jitter analyzer. Benefits include reducing external oscillators, lowering overall jitter, and enabling flexible, precise timing budgets in mixed-signal systems.

Direct one-to-one equivalents depend on specs (inputs/outputs, jitter, packaging). Common cross-references for a dual/quad zero‑delay clock buffer like SI53322‑B‑GM include:
- IDT ICS53300/ICS53302 family
- Analog Devices AD9528/AD9523 clock management devices
- TI CDCLVCxxxx clock buffers
Check cross-reference databases (Digi-Key, Mouser) for exact package and supported frequencies.

Here are the typical features of SI53322-B-GM (Quad, I2C-programmable clock generator/zero-delay buffer; variant -GM is automotive-grade RoHS):
- Four independent clock outputs (quad clock generator/driver)
- I2C programmable: configure frequencies, output formats, dividers, and margins
- Flexible output formats per channel: LVCMOS, LVDS, LVPECL, HCSL (and related CML variants)
- Single reference input (with optional second reference) and PLL-based frequency synthesis (fractional-N capability)
- Spread-spectrum clocking to reduce EMI
- Per-output options: enable/disable, drive-strength, and skew control
- Low jitter / low phase noise suitable for FPGA/SoC timing
- Power-down and selectable output mute for graceful sleep modes
- Robust power/voltage options and broad temperature range (industrial/automotive)
- Package options and RoHS-compliant/lead-free -GM variant
Note: exact numbers (frequency range, jitter specs, drive levels, voltage ranges) are device-specific. For precise figures, refer to the SI53322-B-GM datasheet or use Silicon Labs’ ClockBuilder Pro.

Pin count: 16 pins.
Function: Si53322-B-GM is a dual-output, I2C-programmable clock generator/synthesizer. It takes a reference clock and produces two configurable clock outputs (via independent PLLs/dividers), offering low-jitter timing with support for fractional-N operation and spread-spectrum.

- Manufacturer: Silicon Labs (Silicon Laboratories)
- Company type: A fabless semiconductor company that designs and markets mixed-signal ICs, including timing/clock generators, microcontrollers, and wireless chips; manufacturing is outsourced to external foundries.

Application areas for SI53322-B-GM include:
- High-performance clock generation and fan-out for FPGAs, ASICs, and DSPs
- Jitter-attenuated reference clocks for SerDes links (PCIe, SATA/USB, Ethernet, Fibre Channel) and other high-speed interfaces
- Clock synthesis/translation in telecom and data networking equipment
- Video/graphics timing and display interfaces (HDMI/DisplayPort)
- Clocking for ADC/DAC front-ends and instrumentation requiring low jitter
- Lab/test equipment and systems needing a stable, programmable dual-output clock source

SI53322-B-GM comes in a 16‑lead QFN package (4×4 mm), RoHS (lead-free).