PI6C557-05QLEX

Overview

The PI6C557-05QLEX is a spread spectrum clock generator compliant with PCI Express 2.0 and Ethernet standards, designed for automotive applications. It features an integrated Phase-Locked Loop (PLL) that accepts a 25MHz crystal input to generate four pairs of differential HCSL outputs at selectable frequencies of 100MHz or 200MHz. The device operates on a 3.3V supply (3.135V–3.465V) within an ambient temperature range of -40°C to +85°C. Key electrical parameters include a typical RMS jitter of 2.1ps and cycle-to-cycle jitter of 40ps. It supports spread spectrum modulation options of -0.5%, -1.0%, and -1.5% via external pins.

Feature Summary

• PCI Express 2.0 compliant with AEC-Q100 qualification for automotive use
• Four differential HCSL output pairs configurable for 100MHz or 200MHz
• Spread spectrum selection (-0.5%, -1.0%, -1.5%) via S0-S2 pins
• Low jitter performance: 2.1ps RMS (typical) and 40ps cycle-to-cycle

Applications

• PCI Express 2.0 clock generation in embedded systems
• Ethernet interface timing solutions
• Automotive electronic control units requiring EMI reduction

Procurement Notes

Verify the ordering suffix 'LEX' corresponds to the specific tape and reel packaging configuration as defined by Diodes Incorporated. Confirm RoHS compliance and lead-free status against the latest product change notifications. Ensure the component grade matches the intended automotive application requirements.

Selection Notes

Select this model when four differential HCSL outputs are required for PCIe 2.0 or Ethernet designs. The device requires a 25MHz parallel resonant crystal with less than 30PPM error. External termination resistors (RS=33Ω, RT=49.9Ω) and decoupling capacitors (0.01μF or 0.1μF) are mandatory for proper operation and signal integrity.

Part Context

This component belongs to the PI6C557 series of clock generators manufactured by Diodes Incorporated (formerly Pericom). It is specifically engineered to reduce electromagnetic interference (EMI) in PC and embedded systems through spread spectrum technology while maintaining strict timing compliance for high-speed serial interfaces.

Replacement Considerations

Direct replacements must support four differential outputs, 200MHz maximum frequency, and TSSOP-20 packaging. Verify pin compatibility and electrical specifications such as supply voltage and jitter performance before substitution.