Diodes Incorporated PI4IOE5V6416ZDEX

Overview

PI4IOE5V6416ZDEX from Diodes Incorporated is a low-voltage translating 16-bit I²C-bus I/O expander with dual 8-bit GPIO ports (P0_0–P0_7 and P1_0–P1_7), independent 1.65V–5.5V I²C-bus and port supply rails, programmable output drive strength (up to 10mA per pin), and active-low open-drain interrupt output. It operates across –40°C to +85°C and supports Standard- and Fast-mode I²C (up to 400kHz) for embedded microcontroller peripheral expansion in space-constrained industrial controls.

For engineers reviewing the PI4IOE5V6416ZDEX datasheet, PI4IOE5V6416ZDEX pinout, PI4IOE5V6416ZDEX application, or PI4IOE5V6416ZDEX equivalent, key selection criteria include dual-supply voltage translation capability, per-pin configurable pull-up/pull-down enable and selection, interrupt masking/status registers, and 24-pin TSSOP/TQFN package compatibility with legacy I/O expansion designs.

Technical Context

This I/O expander implements an I²C slave interface with 7-bit address (configurable via ADDR pins), internal register map spanning 32+ registers including input/output, polarity inversion, configuration, drive strength, latch, pull-up/down control, interrupt mask/status, and output port configuration. All 16 I/Os default to high-impedance inputs at power-on reset.

It supports independent VDD(I²C-bus) and VDD(P) supplies (both 1.65V–5.5V), enabling level translation between disparate logic domains. The INT pin asserts low on any enabled I/O state change, with dedicated interrupt status registers (0x4C/0x4D) and mask registers (0x4A/0x4B) for precise event handling without polling.

Key Specifications

Pinout & Package

PI4IOE5V6416ZDEX is housed in a RoHS-compliant, halogen-free 24-pin TSSOP (Package Code: ZD) with 0.65mm pitch and exposed thermal pad. Pin mapping is identical for TSSOP and TQFN variants per Diodes datasheet DS40821 Rev 4-2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C I/O expander applications.

Compared with PCA9555DWR and TCA6424ARGJR, PI4IOE5V6416ZDEX uniquely delivers per-pin pull-up/pull-down configurability, 0.5μA standby current at 1.65V, and four-step drive strength tuning - making it optimal for space-constrained, multi-rail, and battery-sensitive industrial and medical endpoints.

Availability

PI4IOE5V6416ZDEX is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart HVAC controllers, medical infusion pump UIs, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS 3/Green compliance.

Supply support for PI4IOE5V6416ZDEX 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 ICs for power management, signal integrity, and connectivity applications, with design centers across Asia, Europe, and the US.

The PI4IOE5V6416 belongs to Diodes' I/O expander product line, engineered specifically for low-voltage, multi-rail embedded systems requiring robust I²C peripheral expansion with minimal external components and ultra-low power consumption.

FAQ

What is the minimum VDD(P) required for reliable operation of PI4IOE5V6416ZDEX?

The device guarantees full functionality down to VDD(P) = 1.65V, with specified static and dynamic performance across –40°C to +85°C. At 1.65V, standby current is 0.5–1.7μA and output drive strength defaults to 2.5mA per pin - sufficient for short-trace, low-capacitance interfaces in portable equipment.

How does the interrupt output (INT) behave during I/O state changes?

INT is an active-low, open-drain output that asserts when any unmasked I/O pin transitions (input-only or output-change-triggered). The interrupt remains asserted until the corresponding bit in the interrupt status register (0x4C or 0x4D) is read, ensuring no event loss even if the host MCU is delayed in servicing the interrupt.

Can PI4IOE5V6416ZDEX operate with different voltages on VDD(I²C-bus) and VDD(P)?

Yes - VDD(I²C-bus) and VDD(P) are fully independent supplies, each rated 1.65–5.5V. This allows true bidirectional level translation: e.g., a 3.3V MCU's I²C bus can control 1.8V GPIO peripherals without external translators, with SCL/SDA referenced to VDD(I²C-bus) and P0/P1 pins referenced to VDD(P).

What happens to I/O states during power-on reset?

At power-on, all 16 I/Os default to high-impedance inputs with internal pull-ups disabled. The power-on reset threshold is VPOR = 1.1–1.4V (rising) and 0.5V (falling); reset duration exceeds 1μs, ensuring complete register initialization before I²C communication begins.