PI2EQX4401DZFEX

Signal Buffers, Repeaters, Splitters Overview

The PI2EQX4401DZFEX is a low-power, PCI-Express compliant signal re-driver manufactured by Diodes Incorporated. It supports one high-speed PCI-Express lane with a data rate of 2.5 Gbps. The device operates on a single VDD supply voltage ranging from 1.7V to 1.9V (nominal 1.8V ±0.1V). It features adjustable transmitter de-emphasis and amplitude, as well as adjustable receiver equalization controlled via four select bits per channel. The component includes a spread spectrum reference clock buffer output, input signal level detection, and an output squelch function. It utilizes 100Ω differential CML I/Os and consumes approximately 100mW per channel during normal operation.

Signal Buffers, Repeaters, Splitters Feature Summary

• Programmable equalization, amplification, and de-emphasis using four selection bits to optimize performance across various physical mediums and reduce inter-symbol interference.
• Integrated input signal level detection and output squelch functionality that disables the output driver when the input signal falls below the active threshold level.
• Built-in differential clock buffer for test and system requirements, operating independently from the primary data channels.
• Low power consumption with a dedicated stand-by mode activated by a Bus Enable pin to minimize energy usage.

Signal Buffers, Repeaters, Splitters Applications

• PCI-Express signal re-driving between Protocol ASICs and switch fabrics
• Signal extension across backplanes in computer systems
• Extending signals across distant data pathways on user platforms

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix 'ZFEX' corresponds to the 36-contact TQFN package and tape/reel packaging format. Confirm RoHS compliance and lead-free status against current manufacturer definitions. Ensure the design accommodates the 1.8V nominal supply voltage range and external resistor requirements for the IREF pin if utilizing the clock buffer.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component for applications requiring a single-lane PCI-Express repeater with programmable signal conditioning. Consider the 36-pin TQFN footprint for board space constraints. Evaluate the need for the integrated clock buffer versus external alternatives based on system jitter requirements. Verify compatibility with the 100Ω differential CML interface standards required by the target protocol ASIC or switch fabric.

Signal Buffers, Repeaters, Splitters Part Context

The PI2EQX4401D belongs to the EQX series of signal buffers and repeaters designed for high-speed serial interfaces. This specific model focuses on PCI-Express compliance, offering both equalization and de-emphasis capabilities within a single channel. It serves as a bridge component to maintain signal integrity over lossy transmission media such as PCB traces or backplanes.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult Diodes Incorporated directly for end-of-life notifications or alternative recommendations if this specific variant is discontinued.

Signal Buffers, Repeaters, Splitters FAQ

How is the output driver disabled when the input signal is lost?

When the input signal level falls below the active threshold level (Vth-), the output driver switches off, and the pin is pulled to VDD via a high impedance resistor.

What is the function of the IREF pin?

The IREF pin connects to an external 475Ω resistor to set the differential output current. If the clock buffer is not used, this pin should be left unconnected (open).

Can the device operate without the integrated clock buffer?

Yes. If the clock buffer is not utilized, both CLKIN+ and CLKIN- pins should be pulled high to VDD, and the IREF pin should be left open.