Diodes Incorporated PI4IOE5V96224ZLEX

Overview

PI4IOE5V96224 from Diodes Incorporated is a 24-bit I²C-bus I/O expander with quasi-bidirectional ports, designed for remote GPIO expansion in microcontroller-based systems. It operates from 2.3V to 5.5V, supports 1MHz Fast-mode Plus I²C, delivers 25mA sink per I/O, and provides 600mA total package sink capacity-enabling direct LED drive across all 24 pins. Its active-low open-drain INT output signals port state changes without polling.

For engineers reviewing the PI4IOE5V96224 datasheet, PI4IOE5V96224 pinout, PI4IOE5V96224 application, or PI4IOE5V96224 equivalent, key selection criteria include I²C bus drive strength (25mA SDA sink), 64 programmable slave addresses, 5.0V-tolerant I/Os, latched outputs, and integrated Power-On Reset-all critical for scalable, low-overhead peripheral expansion in space-constrained industrial and embedded designs.

Technical Context

The PI4IOE5V96224 implements a quasi-bidirectional I/O architecture where each of the 24 pins defaults to high-impedance input at power-up and can be dynamically configured as input or output via I²C writes-no direction register required. Internal strong pull-ups (I_trt(pu)) enable fast signal rise times on heavily loaded buses.

Its interrupt logic responds to any rising or falling edge on any I/O pin, asserting the open-drain INT line within 4μs; the interrupt clears automatically upon reading the port register or writing to the affected port. The device uses a dedicated 3-pin address scheme (AD0–AD2) to select one of 64 unique I²C slave addresses, eliminating bus conflicts in multi-expander systems.

Key Specifications

Pinout & Package

32-pin, 3mm × 6mm TQFN (ZL) package with exposed thermal pad; RoHS-compliant, halogen-free, and lead-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I/O expander applications.

Compared with TCA6424A and PCA9555, the PI4IOE5V96224 uniquely combines 1MHz I²C, 25mA per-pin sink, 64 addresses, and edge-triggered INT-making it the only option that eliminates both external drivers and polling overhead in high-density, real-time I/O expansion.

Availability

PI4IOE5V96224 is available at Aetrix Electronics and suitable for industrial control panels, smart home hubs, automotive body controllers, and medical device front panels requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PI4IOE5V96224 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and automotive markets.

The PI4IOE5V96224 belongs to Diodes' high-performance I/O expander product line-designed specifically for scalable, low-latency peripheral expansion in resource-constrained embedded systems with demanding I²C bus loading and drive requirements.

FAQ

What is the maximum capacitive load the PI4IOE5V96224 SDA line can drive?

The SDA pin supports up to 4000pF bus capacitance with 30mA sink capability, verified per datasheet DS40440 Rev 2-2. This exceeds standard I²C specifications and eliminates need for bus buffers in most multi-device configurations-even with long traces or multiple connectors.

Does the PI4IOE5V96224 require external pull-up resistors on its I/O pins?

No-its quasi-bidirectional I/Os integrate strong internal pull-ups (I_trt(pu)) that activate automatically when an output is written HIGH. External pull-ups are only required on SDA, SCL, and INT lines per I²C specification; I/O pins operate correctly without them.

How does the interrupt functionality behave after a port read operation?

Reading from any port register automatically resets the INT line to HIGH on the rising edge of the read pulse. Subsequent I/O transitions will reassert INT only after the read completes-preventing spurious interrupts during data acquisition sequences.

Can the PI4IOE5V96224 operate reliably at 2.3V supply while driving 25mA per I/O?

Yes-datasheet Table "IOL Low level output current" specifies 12mA minimum sink at V_CC = 2.3V and V_OL = 0.5V. While 25mA is guaranteed at ≥3.0V, 12mA is sufficient for logic-level signaling and low-current indicators at minimum voltage.