SI53327-B-GM

Clock Buffers, Drivers Overview

The Skyworks SI53327-B-GM is a low-jitter LVPECL fanout clock buffer featuring two selectable inputs and three LVPECL outputs. It supports any-format inputs including LVPECL, LVDS, CML, HCSL, and LVCMOS via a universal input stage. The device operates from DC to 1250 MHz with an additive jitter of typically 50 fs rms. It includes built-in LDOs for high PSRR and independent output enables per bank. Powered by 2.5 V or 3.3 V, it is housed in a 24-QFN (4x4 mm) package and functions within a temperature range of –40 °C to +85 °C.

Clock Buffers, Drivers Feature Summary

• Ultra-low additive jitter: 50 fs rms typical
• Wide frequency range: DC to 1250 MHz
• Any-format inputs with 2:1 selectable mux
• Built-in LDOs for high power supply noise rejection

Clock Buffers, Drivers Applications

• Clock distribution networks
• Redundant clocking systems
• High-speed data converter timing

Clock Buffers, Drivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet revision to ensure compatibility with required packaging and environmental specifications. Confirm that the selected variant matches the intended voltage and thermal requirements for the target application environment.

Clock Buffers, Drivers Selection Notes

Select this component when a low-skew LVPECL buffer with dual-input redundancy is required. Ensure the input signal format matches the universal input capabilities and verify that the output load requirements align with the LVPECL termination schemes provided in the datasheet.

Clock Buffers, Drivers Part Context

This part belongs to the Si53320–28 family of fixed-format LVPECL buffers. It shares core architectural features with siblings like the Si53326 and Si53328 but differs in output count and input format support. It is designed to complement Si534x clocks and Si5xx oscillators for complete clock tree solutions.

Clock Buffers, Drivers Replacement Considerations

Si53328-B-GM offers identical pinout and functionality but is restricted to LVCMOS inputs only. Other family members such as Si53320-B-GT or Si53321-B-GM provide different output counts and may require schematic modifications.

Clock Buffers, Drivers FAQ

What input formats are supported by the SI53327-B-GM?

It supports any-format inputs, including LVPECL, low-power LVPECL, LVDS, CML, HCSL, and LVCMOS.

How is the input source selected?

A CLK_SEL pin selects between the two clock inputs (CLK0 and CLK1). When CLK_SEL is high, CLK1 is active; when low, CLK0 is active.

What is the maximum operating frequency?

The device supports frequencies from DC up to 1250 MHz.