ICS557G-05A

Overview

The ICS557G-05A is a quad differential spread-spectrum clock generator designed for PCI Express applications. It accepts a 25 MHz crystal or clock input and provides four differential HCSL or LVDS outputs at selectable frequencies of 100 MHz or 200 MHz. The device operates on a 3.3 V supply (3.135V to 3.465V) within the commercial temperature range of 0°C to 70°C. Key specifications include a maximum output frequency of 200 MHz, cycle-to-cycle jitter of 80 ps, and an operating supply current of 105 mA. It utilizes external pins for spread spectrum selection and includes power-down and output enable controls.

Feature Summary

• Four differential HCSL or LVDS outputs with spread spectrum capability for EMI reduction
• Supports PCI Express requirements with selectable 100 MHz or 200 MHz output frequencies
• Configurable spread type and amount via external S0, S1, and S2 pins
• Integrated PLL using a 25 MHz crystal or clock input

Applications

• PCI Express clock sources in PC systems
• Embedded systems requiring low electromagnetic interference
• High-frequency clock distribution networks

Procurement Notes

Verify the specific suffix against the ordering information table to confirm packaging and temperature rating. The 'G' suffix indicates the commercial temperature range (0°C to +70°C). The 'LF' suffix denotes lead-free and RoHS compliance. Packaging options include tubes and tape-and-reel configurations depending on the trailing characters.

Selection Notes

Select this component when a quad differential clock source is required for PCI Express Gen 1 designs. Ensure the system requires either HCSL or LVDS output levels, as termination resistors differ between these modes. Verify that the 25 MHz input frequency matches the available crystal or oscillator. For industrial temperature ranges (-40°C to +85°C), the ICS557GI-05A variant must be selected instead.

Part Context

The ICS557G-05A belongs to the 557-05A series of quad differential PCI Express clock sources. It is part of a family that includes variants with different temperature ratings and packaging options, such as the ICS557GI-05A for industrial temperatures. The device was originally manufactured by Integrated Device Technology (IDT), which has since been acquired by Renesas Electronics Corporation.

Replacement Considerations

For industrial temperature requirements, use the ICS557GI-05A. For PCIe Gen 2 applications, consider the 5V41065. For PCIe Gen 3 applications, consider the 5V41235.