PI6C20400BLEX

Overview

The PI6C20400BLEX is a PCIe 3.0 compliant high-speed, low-noise differential clock buffer designed as a companion to PCIe 3.0 clock generators. It distributes the differential SRC clock from a source generator to four pairs of differential clock outputs in either PLL or bypass mode. The device operates with HCSL input and output types at frequencies up to 400 MHz in bypass mode and 105 MHz in PLL mode. It requires a supply voltage between 3.135 V and 3.465 V and functions within an ambient temperature range of -40°C to +85°C.

Feature Summary

• PCIe 3.0 compliant with backward compatibility for PCIe 1.0 and 2.0 specifications
• Four pairs of differential clock outputs with low skew (< 50ps) and cycle-to-cycle jitter (< 50ps)
• Configurable via SMBus interface for output enable, tristate control, and programmable PLL bandwidth
• Supports both PLL mode (up to 105 MHz) and bypass mode (100 MHz to 400 MHz)

Applications

• PCI Express 3.0 chipset clock distribution
• High-speed data communication systems requiring low-jitter clocking
• Server and storage backplane designs

Procurement Notes

Verify that the ordering suffix 'LEX' corresponds to the 28-pin TSSOP package and tape/reel packaging format. Confirm RoHS compliance and lead-free status requirements against specific project standards. Ensure the design accommodates the required external resistor for setting the differential output current via the IREF pin.

Selection Notes

Select this component when a 1:4 differential fanout buffer is needed for PCIe 3.0 applications. Choose the TSSOP package variant if board space constraints require a smaller footprint compared to the SSOP option. Verify that the system power supply can maintain the 3.135 V to 3.465 V range under all operating conditions.

Part Context

This part belongs to the PI6C20400B series of clock buffers manufactured by Diodes Incorporated. The 'LE' suffix indicates the 28-pin Thin Shrink Small Outline Package (TSSOP), while the 'X' suffix denotes tape and reel packaging. It serves as a direct replacement for legacy Pericom Semiconductor devices following the acquisition.

Replacement Considerations

The PI6C20400BHEX is the equivalent device packaged in a 28-pin SSOP. When replacing the LEX variant with the HEX variant, verify that the PCB land pattern supports the wider SSOP pitch or utilize an adapter socket.