PI4IOE5V9557LE

I/o Expanders Overview

The PI4IOE5V9557LE is an 8-bit I2C-bus and SMBus general-purpose parallel input/output (GPIO) expander manufactured by Diodes Incorporated. It operates within a supply voltage range of 2.3V to 5.5V, supporting clock frequencies from 0Hz to 400kHz. The device features 5V tolerant I/Os with open-drain outputs capable of sourcing up to 1mA at 3.3V or 4mA at 2.4V. It includes hardware address pins (A0-A2) for bus multiplexing, an active LOW reset pin, and polarity inversion registers. Packaged in a 16-pin TSSOP, it provides low current consumption with typical standby currents of 1μA.

I/o Expanders Feature Summary

• Provides 8-bit GPIO expansion compatible with I2C-bus and SMBus protocols
• Features 5V tolerant inputs/outputs suitable for mixed-voltage systems
• Includes individual I/O configuration and polarity inversion registers
• Supports multiple devices on the same bus via three hardware address pins

I/o Expanders Applications

• ACPI power switches
• Sensor interface connections
• Push button scanning
• LED control circuits
• Fan speed monitoring

I/o Expanders Procurement Notes

Verify the ordering suffix 'X' indicates tape and reel packaging when sourcing the PI4IOE5V9557LE. Confirm RoHS compliance and halogen-free status requirements against specific project standards. Ensure the selected distributor sources directly from authorized channels to guarantee component authenticity and traceability.

I/o Expanders Selection Notes

Select this component when an 8-bit I/O expansion solution is required for I2C-based systems. It is appropriate for designs needing 5V tolerance on logic lines while operating from lower voltage supplies. Consider the TSSOP-16 package constraints and verify that the application does not require interrupt capabilities, as this specific variant lacks an interrupt output pin.

I/o Expanders Part Context

This part belongs to the PI4IOE5V955x series of I/O expanders designed for low-power applications. It serves as a parallel input/output port solution for embedded controllers requiring additional digital I/O lines without consuming complex microcontroller resources.

I/o Expanders Replacement Considerations

The NXP PCA9557 is a documented functional substitute offering similar 8-bit I/O expansion with reset functionality. Verify pin compatibility and register mapping differences before implementation.