SI5324B-C-GMR

Overview

The SI5324B-C-GMR is a low-bandwidth, jitter-attenuating precision clock multiplier utilizing Skyworks DSPLL technology. It accepts two input clocks from 2 kHz to 710 MHz and generates two output clocks ranging from 2 kHz to 945 MHz, with select frequencies reaching 1.4 GHz. The device features an integrated loop filter with digitally programmable bandwidth between 4 Hz and 525 Hz. It supports I2C or SPI configuration, operates on a single supply of 1.8 V ±5%, 2.5 V ±10%, or 3.3 V ±10%, and meets ITU-T G.8251 and Telcordia GR-253-CORE jitter specifications.

Feature Summary

• Generates any frequency from 2 kHz to 945 MHz (select up to 1.4 GHz) from inputs of 2 kHz to 710 MHz
• Ultra-low jitter outputs as low as 290 fs rms (12 kHz–20 MHz) and 320 fs rms (50 kHz–80 MHz)
• Digitally programmable PLL loop bandwidth from 4 Hz to 525 Hz for optimized jitter performance
• Hitless input clock switching with phase build-out and digital hold capability

Applications

• Broadcast video (3G/HD/SD-SDI, Genlock)
• Packet Optical Transport Systems (P-OTS), MSPP
• SONET OC-48/192/768, SDH/STM-16/64/256 line cards
• GbE/10/40/100G Synchronous Ethernet (LAN/WAN)

Procurement Notes

Verify the specific speed grade suffix 'B' against the manufacturer's ordering guide to confirm frequency limits and electrical characteristics. Confirm that the '-GMR' suffix indicates tape-and-reel packaging suitable for automated surface-mount assembly. Ensure the design accommodates the required 36-lead QFN thermal pad soldering for proper heat dissipation.

Selection Notes

Select this component when sub-1 ps jitter performance is required with low loop bandwidths between 4 Hz and 525 Hz. The device eliminates external VCXO and filter components through its integrated DSPLL solution. Verify compatibility with available input signal formats (LVPECL, LVDS, CML, CMOS) and ensure the system power supply matches the selected voltage option (1.8 V, 2.5 V, or 3.3 V).

Part Context

The SI5324B-C-GMR belongs to the Si5324 family of any-frequency precision clock multipliers. The 'B' designation typically denotes a specific speed grade within the series, while 'C' refers to the commercial temperature range (-40°C to +85°C). This part is part of Skyworks' third-generation DSPLL technology line designed for high-performance timing applications.

Replacement Considerations

Direct replacements within the same package and pinout include other speed grades of the Si5324 family, such as SI5324A-C-GMR, SI5324C-C-GMR, or SI5324D-C-GMR. Verify that the alternative speed grade meets the maximum output frequency requirements of the application.