PI6C20400ALEX

Overview

The PI6C20400ALEX is a PCIe 2.0 compliant high-speed, low-noise differential clock buffer manufactured by Diodes Incorporated. It distributes a single differential SRC clock input to four pairs of differential HCSL outputs in a 28-TSSOP 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. Key electrical parameters include a maximum propagation delay of 6.5 ns in bypass mode, cycle-to-cycle jitter under 50 ps, and additive RMS phase jitter below 1 ps. It operates on a 3.3V supply (3.135V to 3.465V) within an ambient temperature range of -40°C to +85°C.

Feature Summary

• PCIe 2.0 compliant with phase jitter filtering capabilities
• Four pairs of differential HCSL outputs with low skew (<50ps) and low jitter (<50ps cycle-to-cycle)
• Programmable PLL bandwidth and output enable control via SMBus interface
• Supports 100-400 MHz operation in bypass mode and 100 MHz in PLL mode

Applications

• Intel PCIe chipset clock distribution
• High-speed data acquisition systems requiring low-jitter clocking
• Telecommunications equipment utilizing PCIe standards

Procurement Notes

Verify the ordering suffix 'ALEX' corresponds to the 28-pin TSSOP package and tape/reel packaging format as specified in the manufacturer's ordering information. Confirm RoHS compliance and lead-free status requirements for the specific production batch. Ensure the design accommodates the required external IREF resistor for setting differential output current levels.

Selection Notes

Select this component when a 1:4 differential clock fan-out with integrated jitter filtering is required for PCIe applications. Choose the ALEX suffix specifically for surface-mount assembly using the 28-TSSOP footprint. Consider the SMBus control features if dynamic output enabling or tristating is necessary during system power sequencing.

Part Context

This part belongs to the PI6C20400A product line designed as a companion to the PI6C410BS clock synthesizer. It serves as a slave-only SMBus device supporting indexed block read/write protocols. The device family includes variants with different package options, such as the SSOP version (PI6C20400AHE), while maintaining identical functional specifications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify pin compatibility and electrical characteristics against any potential alternative sources before implementation.