Diodes Incorporated PI4IOE5V96248ZLEX

Overview

PI4IOE5V96248 from Diodes Incorporated is a 48-bit I²C-bus I/O expander with quasi-bidirectional ports, 1 MHz Fast-mode Plus interface, 25 mA per I/O sink capability, 5.0 V tolerant I/Os, and active-low open-drain interrupt output - designed for remote LED driving and microcontroller I/O expansion in industrial control panels and embedded HMI systems.

For engineers reviewing the PI4IOE5V96248 datasheet, PI4IOE5V96248 pinout, PI4IOE5V96248 application, or PI4IOE5V96248 equivalent, key selection criteria include total package sink current (1200 mA), 64 programmable slave addresses, latched outputs for direct LED drive, I²C bus drive strength (25 mA SDA sink), and thermal performance in 7 mm × 7 mm TQFN-56 (ZL) packaging.

Technical Context

The device implements a quasi-bidirectional I/O architecture with no direction-control pins: each of the six 8-bit ports defaults to high-impedance input at power-up and can be dynamically configured as input or output via I²C writes. Internal Power-On Reset (VPOR = 1.16–1.41 V) ensures deterministic initialization.

It supports full Fast-mode Plus timing (fSCL up to 1 MHz), includes transient boosted pull-up current (−0.5 to −1.0 mA) for fast rise times on heavily loaded buses, and features an asynchronous open-drain INT output that asserts on any port edge change - enabling low-overhead event-driven polling without continuous I²C traffic.

Key Specifications

Pinout & Package

Package: 56-pin, 7 mm × 7 mm, 0.5 mm pitch TQFN (ZL) with exposed thermal pad (GND). RoHS-compliant, halogen-free, lead-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCA6424A and PCA9555, the PI4IOE5V96248 delivers 2× more I/O bits, 8× more slave addresses, 2.5× higher per-pin drive, and deterministic interrupt behavior - making it the only option capable of scaling to 48-channel, event-driven, mixed-voltage industrial I/O systems without external support components.

Availability

PI4IOE5V96248 is available at Aetrix Electronics and suitable for industrial control panels, embedded HMI systems, automated test equipment, and smart building sensor nodes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for PI4IOE5V96248 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, and consumer markets.

The PI4IOE5V96248 belongs to Diodes' Pericom I/O expansion product line, engineered specifically for high-density, low-latency, interrupt-driven remote I/O in space-constrained industrial and automotive-adjacent applications.

FAQ

What is the maximum number of PI4IOE5V96248 devices supported on a single I²C bus?

The PI4IOE5V96248 supports 64 unique slave addresses via AD2/AD1/AD0 pins, allowing up to 64 units on one I²C bus without address conflict. This assumes proper bus capacitance management - total bus load must remain ≤4000 pF, and SDA sink capability (30 mA) must accommodate cumulative pull-down demand.

Can the PI4IOE5V96248 drive LEDs directly without external current-limiting resistors?

No - although each I/O provides 25 mA sink capability, an external current-limiting resistor is required to set LED forward current and prevent damage due to V_F variation. For example, with a 5 V supply and typical red LED V_F = 2.0 V, a 120 Ω resistor sets ~25 mA. The device's 5.0 V I/O tolerance allows direct use with 5 V LED supplies.

How does the interrupt (INT) pin behave after a port state change is read or written?

The INT pin is automatically de-asserted (goes HIGH) on the falling edge of the SCL clock during a write to the port register that caused the interrupt, or on the rising edge of SCL during a read from that port. This hardware auto-clear mechanism eliminates software polling and guarantees interrupt acknowledgment within one I²C transaction.

Is the thermal pad on the ZL package electrically connected, and how should it be handled on the PCB?

Yes - the exposed thermal pad is internally connected to GND and must be soldered to a dedicated PCB ground plane with ≥4 thermal vias (0.3 mm diameter) for effective heat dissipation and EMI reduction. Leaving it unconnected violates the device's thermal specifications and risks latch-up under sustained 1200 mA sink conditions.