SIT92110AI-Y

Overview

The SiTime SIT92110AI-Y is a 10-output low-jitter clock fan-out buffer designed for high-frequency clock distribution. It features a 3:1 input multiplexer supporting primary, secondary, or crystal sources with LVCMOS outputs. The device operates on independent core (VDD) and output (VDDO) supplies ranging from 1.5 V to 3.3 V. Key electrical parameters include an additive jitter of 50 fs RMS, typical output skew of 30 ps, and a maximum frequency of 250 MHz. It is housed in a 32-pin 5 mm x 5 mm QFN package.

Feature Summary

• 10 LVCMOS outputs with level translation capabilities for 3.3 V, 2.5 V, 1.8 V, and 1.5 V supplies
• Additive jitter performance of 50 fs RMS and typical output skew of 30 ps
• Universal inputs accept LVPECL, LVDS, LVCMOS, SSTL, HCSL, and XTAL waveforms
• Crystal support for frequencies between 8 MHz and 50 MHz with bypass mode up to 250 MHz

Applications

• Low jitter clock distribution in high-speed data systems
• Driving 50 Ω series or parallel terminated transmission lines
• Multi-voltage domain clock buffering requiring independent supply domains

Procurement Notes

Verify the ordering suffix 'Y' corresponds to the tape and reel packaging configuration as defined in the manufacturer's ordering guide. Confirm that the specific revision level matches the design requirements. Ensure supply voltage domains align with the specified VDD and VDDO ranges before procurement.

Selection Notes

Select this component when ten LVCMOS outputs are required from a single clock source. Ensure the input signal meets the minimum slew rate requirement of 2 V/ns for optimal jitter performance. Verify that the target load impedance and termination strategy match the driver capabilities at the chosen VDDO voltage.

Part Context

The SIT92110 belongs to the SiT92xxx series of clock buffers. It provides a solution for distributing a single reference clock to multiple downstream components while maintaining signal integrity. The device supports flexible input selection via pin strapping, allowing adaptation to various system architectures.

Replacement Considerations

Parameter equivalent alternatives include SIT92110AI-T and SIT92110AI-X. These variants share identical electrical specifications but differ in packaging format. Verify compatibility with existing PCB footprints and reflow profiles when substituting.

FAQ

What is the maximum operating frequency of the SiT92110?

The maximum output frequency is 250 MHz for universal clock inputs and 50 MHz when driven by a crystal oscillator.

How is the output enable state controlled?

Pulling the OE pin LOW forces outputs to a high-impedance state after four falling edges of the input signal. Pulling OE HIGH enables the outputs.

Can the crystal input be overdriven?

Yes, the XTAL_IN pin can be overdriven with a single-ended clock signal up to 250 MHz in crystal bypass mode, provided the peak swing does not exceed 1.8 V.