PI2EQX4401DZFE device package

PI2EQX4401DZFEX schematic symbol

PCI Express is a high-speed serial bus expansion standard which is widely used in computer motherboards. The PCI Express stands for Peripheral Component Interconnect Express. The PCI-e is commonly used for interfacing the graphic cards, hard drives, SSD devices, and Ethernet modems with the motherboard. The older versions of the PCI-e were PCI and PCI-X bus standards. In board-to-board and cabled systems, it is often required to enhance the reach of PCI-e bus. PCI-e repeaters are used for this purpose.

Table of Contents

What is PI2EQX4401DZFEX？

The PI2EQX4401DZFEX is a 1-Lane Serial PCI-Express Repeater/Equalizer developed by PERICOM. This low power signal repeater comes with a built-in clock buffer and signal detect feature. The module uses four select bits to provide programmable equalization, amplification, and de-emphasis.

The PI2EQX4401DZFEX supports two 100 Ohm differential CML data I/Os and is capable of extending the signals across remote pathways on the user’s network. The built-in equalization and de-emphasis circuits provide flexibility with signal integrity before and after signal re-driving respectively. Both the channels of the module operate independently and feature low-level signal detection and output squelch function. Apart from signal reconditioning functionality, the PI2EQX4401DZFEX also provides stand-by power management functions. A differential clock buffer is also present in the module for testing and diagnostics purposes.

Pin Configuration

The pins of PI2EQX4401DZFEX are divided into several group types. The description of each group is provided in the table below:

Pin group	Description
VDD, GND	Supply voltage and ground pins
AI	Positive and negative CML input pins for channel A
CLKIN	Differential input reference clock
IREF	External reference resistor to set differential output current
BI	Positive and negative CML input pins for channel B
OUT	Differential reference clock output pins
SEL_A	Selection pins for equalizer
SEL_B	Selection pins for de-emphasis
AO	Positive and negative CML output pins for channel A
BO	Positive and negative CML output pins for channel B
AVDD, AGND	1.8V analog voltage supply and analog ground pins
EN	Enable pin
SIG_A, SIG_B	Signal detector output pins for channel A and B

Features

High speed 2.5Gbps PCI-Express lane
Built-in de-emphasis and equalization circuitry
Adjustable transmitter and receiver equalization
Input signal level detection and output squelch features
100 Ohm differential CML I/Os
Low power consumption (100mW per channel)
Standby mode power management function
Lead-free green packaging

Applications

The major applications of the PERICOM PI2EQX4401DZFEX are given as following:

Signal conditioning and re-driving in board-to-board networks
Signal conditioning and re-driving in cabled networks
Expansion of the PCI-e bus network

Specifications

The major technical specifications of the PI2EQX4401DZFEX are provided as following:

Supply voltage: -0.5V to 2.5V
DC SIG voltage: -0.5V to VDD+0.5V
Current output: -25mA to 25mA
Continuous power dissipation: 500mW
Operating temperature range: 0 to 70^oC
Latency: 2ns
Output resistance: 50 Ohm
Transmission time: 150ps
Packaging: Lead-free 36-pad TQFN

How PI2EQX4401DZFEX work?

The PI2EQX4401DZFEX PCI Express bus signal repeaters are used to expand the outreach of PCI-e bus. These repeaters are used in board-to-board and cabled network systems where the expansion of the local PCI-e serial bus is required.

PI2EQX4401DZFE PCI-e redriver and equalizer application circuit

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