ICS557M-01

Overview

The ICS557M-01 is a clock generator designed for PCI Express cards, providing a pair of differential outputs at 100 MHz in an 8-pin SOIC package. Utilizing patented Phase-Locked Loop (PLL) techniques, it accepts a 25 MHz crystal input to produce HCSL differential outputs. The device supports LVDS signal levels via alternative termination and operates on a 3.3 V supply with low power consumption. It features short-term jitter of 100 ps peak-to-peak and includes output enable functionality via pin selection.

Feature Summary

• Supports PCI Express HCSL outputs with 0.7 V current mode differential pairs
• Accepts 25 MHz crystal input and generates 100 MHz differential outputs
• Operates at 3.3 V with typical supply current of 55 mA
• Short-term jitter specification of 100 ps peak-to-peak

Applications

• PCI Express card clock sources
• PC or embedded systems requiring low EMI
• Systems supporting HCSL or LVDS output levels

Procurement Notes

Verify the specific suffix for packaging requirements: 'T' indicates tape and reel, while no suffix denotes tubes. The 'LF' suffix confirms lead-free RoHS compliance. Confirm temperature range; 'M' designates commercial grade (0°C to +70°C), whereas 'I' indicates industrial grade (-40°C to +85°C). Ensure ordering matches the required environmental rating and shipping format.

Selection Notes

Select the ICS557M-01 for applications requiring a single differential 100 MHz clock source for PCIe Gen 1. Use the 'I' suffix variant if operation below 0°C is necessary. Ensure the PCB layout adheres to the specified trace lengths and termination resistor values (RS=33Ω, RT=49.9Ω) to maintain signal integrity and meet jitter specifications.

Part Context

This component belongs to the IDT/ICS 557 series of PCI Express clock generators. It is functionally similar to the 557-01 but distinguished by its commercial temperature range marking. It serves as a foundational timing solution for legacy PCIe interfaces before the introduction of spread-spectrum variants like the 557-03.

Replacement Considerations

The 557-01 is the direct functional equivalent. For industrial temperature ranges, use the 557MI-01. For PCIe Gen 2 applications, consider the 5V41064. For PCIe Gen 3 applications, consider the 5V41234.