557G-05ALFT

Overview

The Renesas Electronics 557G-05ALFT is a PCI Express (PCIe) spread-spectrum clock generator and fan-out buffer designed for EMI reduction in PC and embedded systems. It accepts a single 25 MHz crystal input and provides four differential outputs with selectable HCSL or LVDS signaling levels. The device operates within a supply voltage range of 3.135 V to 3.465 V and supports output frequencies up to 200 MHz. Packaged in a 20-TSSOP, it functions across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Supports PCIe Gen1 requirements with spread-spectrum capability to reduce electromagnetic interference
• Provides four differential outputs configurable for HCSL or LVDS signaling
• Accepts a 25 MHz crystal input and generates frequencies up to 200 MHz
• Operates on a 3.3 V supply with typical power consumption of 396 mW

Applications

• PCI Express clock source generation
• PC motherboard clock distribution
• Embedded system EMI mitigation

Procurement Notes

Verify the package type is 20-TSSOP and confirm the operating temperature range covers -40°C to +85°C. Ensure the output configuration matches the required HCSL or LVDS levels for the specific design application.

Selection Notes

Select this component when a single-input, four-output differential clock solution is needed for PCIe Gen1 compliance. Compare against the 557G-06LFT if multiplexing functionality is required instead of simple distribution. Verify that the 25 MHz input frequency aligns with the system oscillator.

Part Context

This part belongs to the 557G series of clock generators from Renesas. It serves as a dedicated clock source for high-speed interfaces like PCI Express. Related components include the 557G-06LFT for mux applications and the 557-03 for dual-output configurations.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.