SI52142-A01AGMR

Overview

The Si52142-A01AGMR is a PCIe Gen 1, Gen 2, and Gen 3 compliant two-output clock generator with spread-spectrum capability. It operates on a 3.3 V supply (3.135–3.465 V) and accepts a 25 MHz reference via crystal or clock input. The device provides two differential HCSL-compatible outputs at 100 MHz, 125 MHz, or 200 MHz, alongside a single-ended 25 MHz reference output. Key electrical parameters include a typical dynamic supply current of 40 mA, cycle-to-cycle jitter of 35 ps for differential outputs, and long-term accuracy of 100 ppm.

Feature Summary

• PCIe Gen 1/2/3 common clock compliance with triangular spread spectrum profile (-0.5% modulation)
• Two differential HCSL-compatible outputs (100/125/200 MHz) and one 25 MHz single-ended reference
• Hardware control pins for output enablement and frequency/spread selection
• I2C programmability for skew, edge rate, and amplitude tuning

Applications

• Network attached storage systems
• Multi-function printers
• Wireless access points
• Routers

Procurement Notes

Verify the ordering suffix 'R' confirms tape-and-reel packaging rather than tray. Confirm the specific revision code matches the required hardware version. Ensure the industrial temperature range (-40 to 85 °C) aligns with system thermal constraints. Validate that the 24-pin QFN land pattern requirements are met by the PCB design.

Selection Notes

Select this component when PCIe Gen 1 through Gen 3 timing specifications are required. Use the SS0 and SS1 pins to configure the differential output frequency and spread spectrum settings without I2C intervention. Ensure the external crystal load capacitance calculations account for stray and pin capacitances to maintain the specified 100 ppm long-term accuracy.

Part Context

This part belongs to the Si52142xx family of PCIe clock generators. The 'A01' designation indicates the specific frequency and spread configuration, while 'GMR' denotes the 24-pin QFN package in tape-and-reel format. It serves as a dedicated clock source for high-speed serial interfaces requiring low jitter and EMI reduction.

Replacement Considerations

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