SI5338B-B-GMR

The SI5338B-B-GMR is a high-performance, low-jitter clock generator from Silicon Labs. It integrates a flexible PLL and multiple output dividers to generate up to 8 independent clock outputs with frequencies from 0.16 MHz to 710 MHz.
Key features:
- Ultra-low jitter (<0.5 ps RMS) for high-speed applications.
- I²C-programmable for dynamic frequency adjustments.
- Wide input range (8–200 MHz crystal or 1–250 MHz external clock).
- Output formats: LVDS, LVPECL, LVCMOS, HCSL.
- Industrial-grade (-40°C to +85°C).
Ideal for networking, FPGA/ASIC clocking, and data center applications. Requires minimal external components, simplifying design.
For detailed specs, refer to the datasheet.

Equivalent products to the SI5338B-B-GMR include:
- SI5338A-B-GMR (earlier version)
- SI5332B-B-GMR (fewer outputs)
- SI5341B-B-GMR (higher performance)
- 5P49V60 from Renesas (similar clock generator)
- LMK04828 from Texas Instruments (alternative with more features)
Check datasheets for exact compatibility.

The SI5338B-B-GMR is a high-performance clock generator IC with 32 pins (QFN package).
Key Functions:
- Generates up to 8 output clocks with frequencies from 0.16 MHz to 710 MHz.
- Supports I²C programming for flexible clock configuration.
- Features low jitter (<0.5 ps RMS) for precision timing.
- Operates from a single 3.3V supply.
- Provides LVPECL, LVDS, HCSL, or LVCMOS output formats.
Pin Functions Include:
- Clock outputs (OUT0-OUT7)
- I²C interface (SDA, SCL)
- Power/GND pins
- Crystal/reference input (XTAL/CLKIN)
- Control pins (OE, SEL, etc.)
This IC is commonly used in networking, telecom, and FPGA applications.

The SI5338B-B-GMR is manufactured by Silicon Labs (now part of Skyworks Solutions). Silicon Labs is a leading semiconductor company specializing in mixed-signal, timing, and wireless ICs. Known for high-performance clocks, oscillators, and timing solutions, their products are widely used in communications, industrial, and consumer electronics.
In 2021, Silicon Labs sold its Infrastructure & Automotive business (including timing products like the SI5338B) to Skyworks Solutions, a global semiconductor firm focused on RF and analog chips.
Key points:
- Manufacturer: Silicon Labs (now under Skyworks).
- Industry: Semiconductors (timing, mixed-signal ICs).
- Applications: Networking, data centers, IoT, and more.

The SI5338B-B-GMR comes in a 32-pin QFN (Quad Flat No-Lead) package (5mm x 5mm). This compact, surface-mount package is designed for high-performance clock generation with excellent thermal and electrical performance.