PI4IOE5V9521XTEX

I/o Expanders Overview

The PI4IOE5V9521XTEX is a 2-bit I/O expander from Diodes Incorporated, designed for low-power applications. It operates on an I2C bus and SMBus interface with a maximum clock frequency of 1000 kHz in Fast mode Plus. The device supports a supply voltage range of 2.3 V to 5.5 V. In operating mode at 5.5 V, the typical supply current is 175 μA, while standby current ranges from 0.25 μA to 1 μA depending on input states. It features an open-drain interrupt output and a dedicated reset pin. The component is housed in an 8-pin UQFN package (1.6x1.6 mm) and is rated for operation between -40 °C and +85 °C.

I/o Expanders Feature Summary

• Provides two bidirectional I/O ports accessible via standard I2C and SMBus protocols.
• Includes an open-drain interrupt output pin to signal state changes to the host controller.
• Features a dedicated hardware reset input pin for system initialization or recovery.
• Supports polarity inversion registers to configure input logic levels without external components.

I/o Expanders Applications

• Low power portable electronic devices requiring additional GPIO expansion
• Embedded systems utilizing I2C or SMBus communication buses
• Battery-operated equipment where standby current minimization is critical

I/o Expanders Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm packaging format. The 'X' suffix indicates tape and reel packaging, while 'E' denotes lead-free and green compliance. Ensure the required quantity aligns with the standard reel size specified in the official datasheet to avoid partial reel handling issues during assembly.

I/o Expanders Selection Notes

Select this component when only two general-purpose I/O lines are required for system expansion. Verify that the host controller supports the desired I2C speed mode, up to 1 MHz. Confirm that the available supply voltage falls within the 2.3 V to 5.5 V operational range. Check if the 8-pin UQFN package dimensions fit the PCB layout constraints.

I/o Expanders Part Context

This part belongs to the PI4IOE5V95xx series of low-power I/O expanders manufactured by Diodes Incorporated. The series offers various pin counts and package options to suit different design requirements. The PI4IOE5V9521 specifically provides a minimal footprint solution for applications needing basic digital input/output control over serial interfaces.

I/o Expanders Replacement Considerations

Consult the official Diodes Incorporated cross-reference list for verified substitutes. Ensure any replacement maintains compatibility with the I2C/SMBus protocol and matches the electrical characteristics, particularly the supply voltage range and current consumption specifications.

I/o Expanders FAQ

What is the default state of the I/O pins after a power-on reset?

After a power-on reset, all I/O pins are configured as inputs by default.

How is the device reset using the RESET pin?

The device is reset by lowering the VCC supply to 0.2 V for at least 5 microseconds.

What is the function of the Polarity Inversion Register?

The Polarity Inversion Register allows users to invert the logic polarity of the input ports, enabling flexible configuration of active-high or active-low signals.