Diodes Incorporated PI4IOE5V9673ZDEX

Overview

PI4IOE5V9673ZDEX from Diodes Incorporated is a remote 16-bit I/O expander for Fast-mode Plus (Fm+) I²C-bus, featuring interrupt and reset functionality, 2.3V–5.5V supply operation, -40°C to +85°C temperature range, and 24-pin TQFN package. It serves as a slave peripheral in microcontroller-based systems to extend GPIO count with configurable input/output ports.

For engineers reviewing the PI4IOE5V9673ZDEX datasheet, PI4IOE5V9673ZDEX pinout, PI4IOE5V9673ZDEX application, or PI4IOE5V9673ZDEX equivalent, key selection criteria include I²C address flexibility (8 configurable addresses), open-drain interrupt output, hardware reset input, quasi-bidirectional I/O architecture, and RoHS-compliant green packaging.

Technical Context

The PI4IOE5V9673ZDEX implements a dual 8-bit port architecture (P00–P07 and P10–P17), each pin independently configurable as input or output without direction-control pins. All I/Os default to high-impedance inputs at power-on reset.

It supports Fm+ I²C operation up to 1 MHz, uses a General Call address (0x48) for software reset, and provides an open-drain INT signal that asserts on any input state change. Address configuration is set via AD0/AD1 pins, enabling up to eight devices on one bus.

Key Specifications

Pinout & Package

Package: 24-contact, 4 mm × 4 mm, 0.5 mm pitch Very Thin Quad Flat No-Lead (TQFN-ZD), RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCA9555DWR and TCA6424ARGJR, the PI4IOE5V9673ZDEX delivers superior bus efficiency (1 MHz Fm+), deterministic reset behavior, and compact 24-pin footprint - making it optimal for space-constrained, interrupt-sensitive industrial and automotive edge nodes.

Availability

PI4IOE5V9673ZDEX is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, smart sensor hub interfaces, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for PI4IOE5V9673ZDEX 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 manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance, energy-efficient solutions for industrial, computing, consumer, and automotive markets.

The PI4IOE5V9673ZDEX belongs to Diodes' I/O expansion product line, designed specifically for robust, low-latency GPIO extension in noise-sensitive and resource-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the PI4IOE5V9673ZDEX?

The PI4IOE5V9673ZDEX supports Fast-mode Plus (Fm+) I²C operation up to 1 MHz. This is confirmed in the Dynamic Characteristics section of DS45058 Rev 2-2, where tBUF (bus free time) and tLOW (SCL low time) are specified for 1 MHz operation. It exceeds standard fast-mode (400 kHz) performance, reducing I/O transaction latency in time-critical applications.

Does the PI4IOE5V9673ZDEX require external pull-up resistors on SDA and SCL lines?

Yes, external pull-up resistors are required on both SDA and SCL lines. The datasheet specifies SDA as an open-drain input/output and SCL as an input-only line with internal filtering but no internal pull-up. Typical values range from 1.8 kΩ to 10 kΩ depending on bus capacitance and target speed (1 MHz Fm+ favors lower resistance).

How does the hardware RESET pin function, and what voltage threshold triggers it?

The RESET pin is active-low and asynchronous. According to the Reset section of DS45058 Rev 2-2, VCC must be lowered to ≤0.2 V for at least 20 µs to guarantee reset. In normal operation, asserting RESET low (≤0.2 V) forces all I/Os into high-impedance input state and clears internal port registers - independent of I²C bus state or clock.

Can the PI4IOE5V9673ZDEX drive LEDs directly, and what are the current limits per pin?

Yes, it can drive LEDs directly. Each I/O pin supports up to 25 mA sink/source current, with a total package limit of 400 mA. The datasheet explicitly states this in the "Static Characteristics" table and notes external current limiting is required per I/O. This enables direct LED anode/cathode control without discrete transistors in low-to-moderate brightness applications.