557G-03LF

Overview

The Renesas 557G-03LFT is a spread spectrum clock generator and fan-out buffer designed for PCI Express Gen1 and Ethernet applications. It features a single PLL circuit with a 1:2 input-to-output ratio, accepting a 25 MHz crystal or clock input to produce two differential outputs at frequencies up to 200 MHz. The device operates on a 3.3 V supply (2.97V–3.63V) within an industrial temperature range of 0°C to 70°C. It utilizes HCSL and LVDS output signaling types in a 16-TSSOP surface-mount package.

Feature Summary

• Spread spectrum clock generation capability to reduce electromagnetic interference (EMI) in PC and embedded systems
• Supports PCI Express Gen1 and Ethernet standards with selectable output frequencies (25, 100, 125, or 200 MHz)
• Dual differential outputs available in HCSL or LVDS formats via external pin configuration
• Integrated Phase-Locked Loop (PLL) with 80 ps jitter specification

Applications

• PCI Express Gen1 clock source distribution
• Ethernet interface clock generation
• PC motherboard clock distribution
• Embedded system EMI reduction

Procurement Notes

Verify the specific suffix 'LFT' corresponds to the lead-free, tape-and-reel packaging variant. Confirm the operating temperature grade matches the design requirement, as the LFT version is specified for 0°C to 70°C. Check datasheet revision history for any pinout or electrical parameter updates prior to finalizing procurement specifications.

Selection Notes

Select this component when a single-ended or crystal input must be converted into two differential clock signals for PCIe or Ethernet links. Ensure the load capacitance requirements for the 25 MHz input crystal are compatible with the internal oscillator circuit. Verify that the required output swing levels for HCSL or LVDS match the receiving device's input thresholds.

Part Context

This part belongs to the 557G series of high-performance clock generators from Renesas. It serves as a direct successor or alternative to earlier ICS557G variants, maintaining compatibility with legacy designs while offering updated manufacturing processes. The '03' designation typically indicates the specific frequency multiplication and output configuration within the family.

Replacement Considerations

The 557GI-03LF is a related variant with an extended temperature range (-40°C to 85°C). For non-spread spectrum requirements, consider the 557G-01LFT. Verify pin-to-pin compatibility before substituting with other 557-series devices.