PI4IOE5V9555LEX

I/o Expanders Overview

The PI4IOE5V9555LEX is a 16-bit I2C-bus and SMBus I/O port expander manufactured by Diodes Incorporated. It provides general-purpose parallel input/output expansion for I2C/SMBus applications, featuring 5V tolerant I/Os and an active LOW interrupt output. The device operates with a power supply voltage ranging from 2.3V to 5.5V and supports clock frequencies up to 400 kHz. It includes noise filters on SCL/SDA inputs, polarity inversion registers, and ESD protection rated at 4 kV HBM. The component is housed in a TSSOP-24 package.

I/o Expanders Feature Summary

• Provides 16 programmable I/O pins configurable as inputs or outputs
• Features 5V tolerant I/Os with high driving capability
• Includes an active LOW open-drain interrupt output for state change detection
• Supports multiple devices on the same bus via three address selection pins

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button arrays
• LED control circuits
• Fan speed monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'LEX' corresponds to the TSSOP-24 package and tape/reel packaging format. Confirm RoHS compliance and lead-free status requirements match project specifications. Ensure the selected distributor sources directly from authorized channels to guarantee product authenticity and traceability.

I/o Expanders Selection Notes

Select this component when expanding GPIO capacity for I2C or SMBus systems requiring 5V tolerance. Consider the TSSOP-24 package size constraints and the need for individual I/O configuration. Evaluate the low current consumption benefits for battery-operated designs and verify that the interrupt functionality meets system latency requirements.

I/o Expanders Part Context

This part belongs to the PI4IOE series of I/O expanders designed for low-power applications. It shares functional similarities with other models in the family but differs in pin count and package options. The LEX suffix specifically denotes the TSSOP-24 surface-mount package variant offered by Diodes Incorporated.

I/o Expanders Replacement Considerations

The PI4IOE5V9555ZDEX serves as a direct functional substitute using a TQFN-24 package. Verify pinout compatibility and thermal characteristics when transitioning between TSSOP and TQFN packages. Ensure register configurations remain identical during replacement.

I/o Expanders FAQ

How many devices can share the same I2C bus?

Up to eight PI4IOE5V9555 devices can share the same I2C bus/SMBus by utilizing the three address input pins (A0, A1, A2) to select from eight preset addresses.

What happens to the I/O pins after a power-on reset?

Upon power-on reset, all I/O pins are configured as inputs with high-impedance output drivers and weak pull-ups to VCC. All registers return to their default values.

Can an I/O pin configured as an output trigger an interrupt?

No, only pins configured as inputs can cause an interrupt. The interrupt output activates when an input state changes and deactivates when the Input Port register is read.