PI6C20400AHEX

Overview

The PI6C20400AHEX is a PCIe 2.0 compliant high-speed, low-noise differential clock buffer manufactured by Diodes Incorporated. It distributes a single differential HCSL input clock to four pairs of differential outputs in a 28-pin SSOP package. The device supports both PLL and bypass modes, operating at frequencies up to 400 MHz in bypass mode and 100 MHz in PLL mode. It features programmable PLL bandwidth, output enable controls, and SMBus interface for configuration. Designed as a companion to the PI6C410BS synthesizer, it provides low skew and jitter performance suitable for Intel chipset applications.

Feature Summary

• Four pairs of differential HCSL outputs with low skew (<50ps) and cycle-to-cycle jitter (<50ps)
• Supports 100-400 MHz operation in bypass mode and 100 MHz in PLL mode
• Programmable PLL bandwidth and output enable control via hardware pins or SMBus
• Outputs tristate control via SRC_STOP# and PWRDWN# inputs

Applications

• PCI Express (PCIe) 2.0 clock distribution
• Intel chipset clock buffering
• Companion device for PI6C410BS clock synthesizers

Procurement Notes

Verify the 'HEX' suffix indicates the 28-pin SSOP package with tape-and-reel packaging. Confirm RoHS compliance and lead-free status against current manufacturer definitions. Check for specific automotive qualification requirements if applicable, as standard parts may differ from AEC-Q100 qualified versions.

Selection Notes

Select this component when a 1:4 differential clock fan-out with integrated PLL filtering is required for PCIe 2.0 systems. Ensure the design accommodates the 3.3V supply voltage range of 3.135V to 3.465V. Consider the SMBus interface needs for dynamic configuration versus fixed hardware control options.

Part Context

This part belongs to the PI6C20400A series of clock buffers. The 'H' designation specifies the 28-pin wide SSOP package, while 'E' denotes lead-free and green material composition. The 'X' suffix typically indicates tape-and-reel packaging for automated assembly.

Replacement Considerations

The PI6C20400ALEX is a direct pin-compatible alternative using a 28-pin TSSOP package instead of SSOP. Verify package dimensions and thermal characteristics before substitution.