PI6C557-03AQLE

Overview

The PI6C557-03AQ is a spread spectrum clock generator compliant with PCI Express 2.0 and Ethernet requirements, designed for PC or embedded systems to reduce electromagnetic interference (EMI). It utilizes a Phase-Locked Loop (PLL) technique to accept a 25MHz crystal or clock input and generate two pairs of differential outputs in HCSL or LVDS formats. The device supports output frequencies of 25MHz, 100MHz, 125MHz, and 200MHz. It operates on a 3.3V ±10% supply voltage within an ambient temperature range of -40°C to +85°C. The component is AEC-Q100 qualified for automotive applications.

Feature Summary

• PCIe 2.0 compliant with phase jitter of 2.1ps RMS (typical)
• Provides two differential outputs (HCSL or LVDS) selectable via external pins
• Supports spread spectrum selection of -0.5%, -0.75%, or no spread
• AEC-Q100 qualified and suitable for automotive applications

Applications

• PC motherboard clock generation
• Embedded system timing solutions
• Automotive electronic control units requiring specific change control

Procurement Notes

Verify the package code 'L' corresponds to the 16-pin TSSOP variant when ordering. Confirm that the suffix 'E' indicates lead-free and green status. Ensure the application environment meets the specified operating temperature range of -40°C to +85°C. Check for any specific packaging requirements such as tape and reel if indicated by additional suffixes like 'X'.

Selection Notes

Select this component when PCIe 2.0 compliance and EMI reduction are required. Choose based on the desired output frequency (25MHz, 100MHz, 125MHz, or 200MHz) using the S1/S0 pin configuration. Consider the spread spectrum requirement (-0.5% or -0.75%) via SS1/SS0 pins. Ensure the design can accommodate the 3.3V supply and 95mA typical operating current.

Part Context

This part belongs to the PI6C557 series of clock generators from Diodes Incorporated. It is specifically tailored for automotive-grade applications due to its AEC-Q100 qualification and IATF 16949 manufacturing certification. It serves as a specialized timing solution compared to standard commercial clock generators.

Replacement Considerations

Direct replacements must match the 16-TSSOP package and AEC-Q100 qualification. Verify compatibility with PCIe 2.0 specifications and ensure similar jitter performance (35ps cycle-to-cycle typical). Check if alternative parts support the same spread spectrum options and output formats (HCSL/LVDS).

FAQ

How is the output frequency selected?

The output frequency is selected using the S1 and S0 input pins. Setting S1=0, S0=0 yields 25MHz; S1=0, S0=1 yields 100MHz; S1=1, S0=0 yields 125MHz; and S1=1, S0=1 yields 200MHz.

What spread spectrum options are available?

The device allows spread selection via the SS1 and SS0 pins. Options include no spread (SS1=0, SS0=0), down spread of -0.5% (SS1=0, SS0=1), and down spread of -0.75% (SS1=1, SS0=0).

Is the device suitable for automotive use?

Yes, the PI6C557-03AQ is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities, making it suitable for automotive applications requiring specific change control.