PI6C557-05LEX

Overview

The PI6C557-05LEX is a spread spectrum clock generator compliant with PCI Express 2.0 and Ethernet requirements, designed to reduce electromagnetic interference in PC or embedded systems. It utilizes a patented Phase-Locked Loop (PLL) technique with a 25MHz crystal or reference input to generate four pairs of differential outputs at selectable 100MHz or 200MHz frequencies. The device supports HCSL and LVDS output types, offering configurable spread selection of -0.5%, -1.0%, -1.5%, or no spread via external pins. Operating on a 3.3V supply within an industrial temperature range of -40°C to +85°C, it features low RMS jitter of 3.1ps typical.

Feature Summary

• PCI Express 2.0 compliant with four differential HCSL or LVDS outputs
• Configurable spread spectrum options: -0.5%, -1.0%, -1.5%, and no spread
• Low phase jitter performance: 2.1ps RMS typical, 40ps cycle-to-cycle typical
• Supports 25MHz crystal or CMOS reference input with selectable 100MHz/200MHz outputs

Applications

• PC motherboard clock generation
• Embedded system timing solutions
• Ethernet interface synchronization
• PCI Express 2.0 compliant hardware designs

Procurement Notes

Verify the 'LEX' suffix indicates the 20-pin TSSOP package and tape/reel packaging format. Confirm RoHS compliance and lead-free status as specified in the manufacturer's documentation. Ensure the ordering code matches the required output frequency and spread configuration for the specific application design.

Selection Notes

Select this component when designing for PCI Express 2.0 or Ethernet applications requiring EMI reduction through spread spectrum techniques. Choose based on the required output frequency (100MHz or 200MHz) and the necessary spread percentage (-0.5%, -1.0%, or -1.5%). Ensure the system power supply is stable at 3.3V ±5% and that the layout guidelines for HCSL or LVDS termination are followed to maintain signal integrity.

Part Context

The PI6C557-05 is part of Diodes Incorporated's PCIe clock generator family. The 'LEX' suffix specifically denotes the 20-pin TSSOP package with tape and reel packaging. This variant is optimized for high-volume manufacturing while maintaining the electrical characteristics of the standard PI6C557-05 series.

Replacement Considerations

Direct pin-compatible replacements within the same family include other PI6C557 variants with different package codes (e.g., BLE for TSSOP-16). Verify output count and package dimensions before substitution. Cross-model compatibility depends on matching the specific spread selection logic and output drive strength requirements.