ICS557M-01T

Overview

The ICS557M-01T is a clock generator designed for PCI Express applications, manufactured by Renesas Electronics Corporation. It utilizes a Phase-Locked Loop (PLL) to convert a 25 MHz crystal input into a 100 MHz differential output. The device supports HCSL and LVDS signaling levels within an 8-pin SOIC package. Key electrical parameters include a supply voltage range of 3.135V to 3.465V, a maximum operating temperature of +70°C, and short-term jitter of 100 ps peak-to-peak. It consumes 55 mA at full load.

Feature Summary

• PCI Express compliant clock source with 100 MHz differential outputs
• Supports both HCSL and LVDS output signal levels
• Integrated PLL converts 25 MHz crystal input to 100 MHz
• Low power consumption with 55 mA operating current

Applications

• PCI Express cards as a primary clock source
• PC and embedded systems requiring low EMI
• Ethernet applications compatible with PCIe timing

Procurement Notes

Verify the 'T' suffix indicates tape and reel packaging rather than tube. Confirm RoHS compliance status, as non-green parts have reached end-of-life. Ensure the commercial temperature grade (+70°C max) meets system requirements instead of the industrial variant.

Selection Notes

Select this component when a single-ended 25 MHz crystal must drive a 100 MHz PCIe interface. Compare against the ICS557MI-01T if an extended -40°C to +85°C temperature range is required. Verify that the 8-pin SOIC footprint fits the PCB layout constraints.

Part Context

This part belongs to the ICS557 series of PCI Express clock sources. It serves as a foundational timing component for Gen1 PCIe designs. Related models in the family include the ICS557-03 for dual outputs and higher frequency support.

Replacement Considerations

ICS557MI-01T: Industrial temperature version (-40°C to +85°C).

FAQ

How is the output enabled or disabled?

The OE pin controls the output state. A high logic level enables the differential outputs, while a low logic level tristates them.

What external components are required for the crystal circuit?

A 25 MHz fundamental mode parallel resonant crystal with a 16 pF load capacitance is required. External capacitors should be calculated based on the formula CL = (Cload - 8) * 2.

Can the device operate with LVDS levels?

Yes, LVDS signal levels can be supported via an alternative termination scheme using specific resistor values (RP, RQ, RT) as detailed in the datasheet guidelines.