SI53321-B-GQR

Clock Buffers, Drivers Overview

The Skyworks SI53321-B-GQR is a low-jitter LVPECL fanout clock buffer featuring ten LVPECL outputs. It accepts any-format inputs, including LVPECL, LVDS, CML, HCSL, and LVCMOS, via a 2:1 input multiplexer. The device operates over a wide frequency range from DC to 1250 MHz with typical ultra-low additive jitter of 50 fs rms. Built-in LDOs provide high power supply noise rejection (PSRR), reducing external component requirements. It supports independent output enable control and format translation within a 32-eLQFP package.

Clock Buffers, Drivers Feature Summary

• Ten LVPECL outputs with selectable 2:1 input mux for redundant clocking
• Ultra-low additive jitter performance of 50 fs rms
• Wide frequency range from DC to 1250 MHz
• Universal input termination supporting LVPECL, LVDS, CML, HCSL, and LVCMOS

Clock Buffers, Drivers Applications

• Clock distribution in noisy environments
• Redundant clocking architectures
• High-speed data acquisition systems

Clock Buffers, Drivers Procurement Notes

Verify the specific ordering suffix '-GQR' against the manufacturer's official documentation to confirm the exact package type and tape-and-reel configuration. Ensure compatibility with the required voltage levels and input signal formats before procurement.

Clock Buffers, Drivers Selection Notes

Select this component when a fixed LVPECL output format is required alongside flexible input options. The built-in LDOs simplify design by minimizing the need for external filtering components. Confirm that the 32-eLQFP package dimensions fit the target PCB layout constraints.

Clock Buffers, Drivers Part Context

This part belongs to the Si53320–28 family of low-jitter LVPECL fanout buffers. The family offers various configurations ranging from two to ten outputs, with some variants limited to single-ended LVCMOS inputs. The Si53321 specifically provides ten outputs with universal input support.

Clock Buffers, Drivers Replacement Considerations

Direct replacements within the same family include the Si53321-B-GM, which shares identical electrical specifications but utilizes a 32-QFN package instead of the eLQFP form factor.