557GI-05ALFT

Overview

The Renesas 557GI-05ALFT is a PCI Express spread-spectrum clock generator designed for EMI reduction in PC and embedded systems. It features a single input driving four differential outputs with selectable HCSL or LVDS signaling levels. The device operates on a 3.3V supply (3.135V to 3.465V) and supports a maximum output frequency of 200 MHz from a 25 MHz crystal input. Packaged in a 20-TSSOP, it includes an internal PLL and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Four differential outputs supporting both HCSL and LVDS signaling standards
• Spread-spectrum capability for significant electromagnetic interference (EMI) reduction
• Internal Phase-Locked Loop (PLL) with 1:4 input-to-output ratio
• Configurable output frequency and spread type via external pins

Applications

• PCI Express Gen1 clock source generation
• PC motherboard clock distribution
• Embedded system timing solutions requiring EMI compliance

Procurement Notes

Verify the package designation matches the 20-TSSOP form factor with a 0.65mm pitch. Confirm the suffix 'LFT' indicates lead-free RoHS compliance as specified by the manufacturer. Ensure the operating voltage requirements align with the 3.3V nominal supply specification before procurement.

Selection Notes

Select this component when four differential clock outputs are required for PCIe applications. Compare against the 557GI-03LFT if only two outputs are needed. Verify that the 200 MHz maximum frequency meets the target bus speed requirements and that the TSSOP-20 package fits the PCB layout constraints.

Part Context

This part belongs to the 557G series of clock generators optimized for PCI Express interfaces. It serves as a direct replacement for legacy IDT clock sources in designs transitioning to Renesas Electronics components. The series focuses on low jitter and EMI mitigation for high-speed digital buses.

Replacement Considerations

The 557GI-03LFT offers a similar function but provides only two differential outputs in a 16-pin TSSOP package. Designers requiring fewer outputs may consider this alternative to save board space.