NXP Semiconductors PCA9674N,112

Overview

The PCA9674N,112 from NXP Semiconductors is an 8-bit quasi-bidirectional I/O expander for Fast-mode Plus (Fm+) I²C-bus systems, providing remote GPIO expansion with active-low open-drain interrupt output, 1 MHz I²C-bus support, and 25 mA per-pin sink capability for direct LED driving in industrial control and server applications.

For engineers reviewing the PCA9674N,112 datasheet, PCA9674N,112 pinout, PCA9674N,112 application, or PCA9674N,112 equivalent, key selection criteria include its DIP16 package compatibility, 64 programmable slave addresses, 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os, and total package sink capacity of 200 mA - critical for high-density LED signage and PLC I/O expansion.

Technical Context

The PCA9674N,112 implements a latch-based quasi-bidirectional I/O architecture where all eight ports default to HIGH at power-up, enabling immediate use as inputs without configuration. Its internal Power-On Reset (POR) and software reset via General Call address (00h) + 06h data byte ensure deterministic initialization.

It supports Fm+ I²C-bus timing with 1 MHz clock rate, 30 mA SDA sink drive for 4000 pF bus loads, and interrupt generation on any port edge transition - with INT deactivation synchronized to write/read pulse edges to prevent spurious triggers during register access.

Key Specifications

Pinout & Package

PCA9674N,112 is supplied in a 16-pin plastic dual in-line package (DIP16), 300 mil body width, compatible with through-hole PCB assembly and legacy socketing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCF8574N,112, the PCA9674N,112 delivers 2.5× higher I²C bandwidth and 2× total sink current, while PCA9674PW,118 offers identical functionality in a smaller TSSOP package - making PCA9674N,112 optimal for through-hole industrial boards requiring maximum drive and address flexibility.

Availability

PCA9674N,112 is available at Aetrix Electronics and suitable for industrial control, medical equipment, and server management applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.

Supply support for PCA9674N,112 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The PCA9674N,112 belongs to NXP's Fast-mode Plus I²C peripheral portfolio, designed specifically to extend microcontroller GPIO resources in noise-immune, high-density industrial and medical systems with robust interrupt-driven operation.

FAQ

What is the maximum I²C-bus speed supported by the PCA9674N,112?

The PCA9674N,112 supports Fast-mode Plus (Fm+) I²C-bus operation up to 1 MHz, enabling faster data transfer and real-time response in time-critical applications such as LED PWM dimming and server status monitoring. This is double the 400 kHz limit of legacy PCF8574 devices and ensures minimal bus contention in multi-node systems.

How does the interrupt (INT) pin function on the PCA9674N,112?

The INT pin on the PCA9674N,112 is an active LOW open-drain output that asserts when any of the eight I/O ports changes state. It remains LOW until the host reads the port register or writes new data - ensuring edge-triggered notification without missed events. The PCA9674N,112 requires an external pull-up resistor to VDD or the host's interrupt rail.

Can the PCA9674N,112 directly drive LEDs, and what is its per-pin current capability?

Yes, the PCA9674N,112 can directly drive LEDs with a guaranteed 25 mA sink current per I/O pin (P0–P7), and a total package sink capacity of 200 mA. This eliminates the need for external driver transistors in most indicator and signage applications, provided thermal design accommodates the power dissipation at full-load conditions.

What are the valid supply voltage and I/O tolerance ranges for the PCA9674N,112?

The PCA9674N,112 operates from 2.3 V to 5.5 V on VDD and features 5.5 V tolerant I/O pins - meaning inputs and outputs remain functional and undamaged even when driven by 5 V logic signals while VDD is as low as 2.3 V. This simplifies level-shifting in mixed-voltage systems.

How many unique I²C slave addresses does the PCA9674N,112 support, and how are they configured?

The PCA9674N,112 supports 64 unique I²C slave addresses, selected using the three hardware address pins AD0, AD1, and AD2. Each pin can be tied to VDD, VSS, SCL, or SDA to generate distinct combinations - allowing up to 64 devices on a single I²C bus without address conflicts, unlike the PCF8574's limited 8-address space.