SI5321-H-ZL4

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5321-H-ZL4 is a precision clock multiplier and jitter attenuator manufactured by Skyworks Solutions Inc. It generates any frequency from 2 kHz to 945 MHz and select frequencies up to 1.4 GHz from an input frequency of 2 kHz to 710 MHz. The device features ultra-low jitter clock outputs as low as 290 fs rms (12 kHz–20 MHz) and 320 fs rms (50 kHz–80 MHz). It includes an integrated loop filter with selectable bandwidths between 4 Hz and 525 Hz, supports ITU-T G.8251 and Telcordia GR-253-CORE specifications, and offers hitless input clock switching with phase build-out. The component operates on a single supply voltage of 1.8 V ±5%, 2.5 V ±10%, or 3.3 V ±10% and is housed in a small 6 x 6 mm 36-lead QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any frequency from 2 kHz to 945 MHz and select frequencies to 1.4 GHz
• Ultra-low jitter clock outputs as low as 290 fs rms
• Integrated loop filter with selectable loop bandwidth
• Hitless input clock switching with phase build-out

Clock Generators, PLLs, Frequency Synthesizers Applications

• Telecommunications infrastructure requiring precise clocking
• Data center equipment needing jitter attenuation
• Industrial systems utilizing high-frequency signal generation

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix ZL4 against official Skyworks documentation to confirm pinout, packaging, and electrical characteristics match your design requirements. Ensure compatibility with I2C or SPI programming interfaces if programmable configuration is needed. Confirm RoHS compliance status through the manufacturer's datasheet before finalizing procurement plans.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when designing systems that require flexible frequency multiplication and significant jitter reduction from noisy input clocks. Consider the integrated loop filter and selectable bandwidth for optimizing noise performance versus lock time. Verify that the available supply voltages align with your system's power architecture and that the QFN package fits within your PCB layout constraints.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The SI5321 belongs to Skyworks' family of precision clock multipliers and jitter attenuators designed for high-performance applications. These devices are engineered to clean and multiply reference clocks, ensuring signal integrity in sensitive digital systems. The H-grade designation typically indicates specific temperature range or performance tier variations within the product line, necessitating datasheet verification for exact operational limits.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.