SI52142-A01AGM

Overview

The Si52142-A01AGM is a PCIe Gen 1, Gen 2, and Gen 3 compliant two-output clock generator with spread-spectrum capability. It provides two differential HCSL-compatible outputs at 100 MHz, 125 MHz, or 200 MHz, alongside a 25 MHz reference output. The device operates on a single 3.3 V supply (3.135 V to 3.465 V) and draws up to 40 mA. It accepts a 25 MHz crystal or clock input via XIN/CLKIN. Key electrical parameters include a cycle-to-cycle jitter of 50 ps maximum for differential outputs and a long-term accuracy of 100 ppm.

Feature Summary

• PCIe Gen 1, Gen 2, Gen 3 common clock compliance
• Two differential outputs (100/125/200 MHz) and one 25 MHz REF output
• Hardware OE pins for synchronous start/stop control
• I2C programmability for skew, edge rate, and amplitude tuning
• Triangular spread spectrum profile (-0.5% modulation)

Applications

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

Procurement Notes

Verify the ordering suffix 'GM' corresponds to the standard 24-pin QFN package configuration. Confirm that the specific revision matches the required hardware version, as register defaults may vary between revisions. Ensure the design supports the necessary I2C interface if dynamic control features are utilized.

Selection Notes

Select this component when a dual-differential clock source with integrated spread spectrum is required for PCIe applications. The SS0 and SS1 pins allow frequency selection without I2C programming. Verify that the load capacitance calculations for the external crystal meet the 12–15 pF requirement to ensure accurate 25 ppm stability.

Part Context

This part belongs to the Si52142xx family of PCIe clock generators. The 'A01' designation typically indicates the specific frequency and feature set configuration. The 'GM' suffix denotes the 24-pin Quad Flat No-lead (QFN) package variant suitable for surface-mount assembly.

Replacement Considerations

The Si52142-A01AGMR is the tape-and-reel equivalent of the Si52142-A01AGM. Both share identical electrical specifications and pinouts; the distinction lies solely in the shipping packaging format.