SI5341B-D-GMR

SI5341B-D-GMR is Silicon Labs’ Si5341 Any-Frequency Clock Generator/Jitter Cleaner. It derives multiple low-jitter outputs from a single reference (crystal or oscillator) using programmable fractional-N PLLs. The “B” indicates a revision with performance enhancements over older revisions; “D” is the package code and “GMR” the RoHS/reel/package designation.
Key points:
- Up to 4 independent outputs from one reference
- Fractional-N PLLs with a wide VCO range for flexible frequency synthesis
- Optional spread-spectrum and good jitter performance
- Programmable output formats: LVCMOS, LVDS/HCSL/CML; adjustable drive strength
- I2C two-wire serial control; software/config via ClockBuilder Pro
- Common applications: clock generation for FPGAs/SoCs, processors, memory interfaces, SERDES, network gear, test equipment
Typical use:
- Provide a reference clock (crystal/oscillator)
- Program desired output frequencies and formats
- Route outputs to system clocks, with proper power supply decoupling
Packaging: D-package, RoHS-compliant (GMR). For exact electrical limits and register maps, consult the datasheet.

Here are the typical features of the SI5341B-D-GMR (clock generator/jitter cleaner family):
- I2C-programmable clock generator with 1 reference input and multiple outputs
- Fractional-N PLL for flexible frequency synthesis from a single reference
- Up to four programmable clock outputs (configurable per-output enable)
- Output formats: selectable LVCMOS/CMOS, LVDS, LVPECL, or HCSL per output
- Jitter cleaning / jitter transfer reduction for cleaner clock signals
- Spread-spectrum clocking to reduce EMI
- Holdover and loss-of-reference detection for reliable operation during reference loss
- Independent output enables and power-down control for power management
- Separate core and I/O supply domains (flexible power handling)
- Low power consumption and small package option
- Operating range suitable for industrial temperatures (and RoHS-compliant)
Note: exact output count, voltage options, and package specifics vary by variant; the B-D-GMR designation denotes revision/packaging options within the SI5341 family.

It’s in a 16‑pin QFN package (4x4 mm), RoHS‑compliant.

- Pin count: 8 pins (8-pin package).
- Function: SI5341B-D-GMR is an Any-Rate Clock Multiplier/Divider clock generator. It takes a single reference input and provides up to four independently programmable output clocks (low-jitter), programmable via I2C.

- Manufacturer: Silicon Laboratories (Silicon Labs).
- What kind of company: A fabless semiconductor company that designs and sells mixed-signal integrated circuits, including timing/clocking ICs, microcontrollers, wireless, and related software.

SI5341B-D-GMR is an Any-Output Clock Multiplier/Jitter Cleaner. Common applications:
- FPGA/ASIC clock generation (low-jitter, multiple outputs)
- Memory interfaces (DDR/LPDDR, SRAM) references
- High-speed SerDes/backsplane interfaces (PCIe, SATA, USB 3.0, Ethernet PHY, SGMII)
- Telecom and networking equipment (switches, routers, line cards)
- Test and measurement equipment requiring stable clocks
- Clock distribution and synchronization networks

There is no published 1:1 cross reference for SI5341B-D-GMR. Closest substitutes by function are:
- Silicon Labs: other Si534x devices (e.g., Si5341A/B/C, Si5342/Si5343/Si5344/Si5345)
- IDT: 8T49N family zero-delay buffers
- TI: CDCLVC series clock buffers
- Analog Devices: AD9520/AD9528 clock distribution families
Note: ensure matching outputs, frequencies, jitter performance, temp range, and package (D-GMR) when selecting a replacement.