PI6C20400BHEX

Overview

The PI6C20400BHEX is a PCIe 3.0 compliant high-speed, low-noise differential clock buffer manufactured by Diodes Incorporated. Designed as a companion to PCIe 3.0 clock generators, it distributes the differential SRC clock to four pairs of differential outputs in either PLL or bypass mode. The device operates on a single 3.3V supply (3.135V to 3.465V) and supports input frequencies up to 400 MHz in bypass mode. It features programmable PLL bandwidth, output enable control, and SMBus interface for configuration. Packaged in a 28-pin wide SSOP (H28), it ensures low skew (<50ps) and low jitter performance suitable for Intel PCIe 3.0 chipsets.

Feature Summary

• PCIe 3.0 compliant with backward compatibility for Gen1 and Gen2 specifications
• Four pairs of differential HCSL outputs with <50ps skew and <50ps cycle-to-cycle jitter
• Programmable PLL bandwidth and selectable PLL/Bypass modes (100MHz PLL / 100-400MHz Bypass)
• SMBus interface for indexed block read/write and individual output enable/tristate control

Applications

• Intel PCIe 3.0 chipset clock distribution
• PCI Express 3.0/2.0/1.0 system designs
• High-speed server and storage backplanes

Procurement Notes

Verify the ordering suffix 'HEX' corresponds to the 28-pin wide SSOP package and tape/reel packaging format. Confirm RoHS compliance and Halogen-free status requirements match project specifications. Ensure the design accounts for the specific 3.3V power supply tolerance range of 3.135V to 3.465V during procurement validation.

Selection Notes

Select this component when a 1:4 differential clock fan-out with integrated PLL filtering is required for PCIe applications. Choose the HEX suffix specifically for the 28-SSOP (H28) package form factor. Consider the SMBus control capabilities if dynamic output enabling or tristating is needed. Verify that the 400 MHz maximum bypass frequency meets the system clock generator requirements.

Part Context

This part belongs to the PI6C20400B series from Diodes Incorporated, which includes variants like the BLEX (TSSOP package). The PI6C20400BHEX specifically denotes the wide SSOP package version. It is distinct from other clock buffers in the portfolio that may lack PCIe-specific jitter filtering or SMBus integration.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Diodes Incorporated directly for qualified alternatives or pin-compatible replacements.