PCA9674D,518

I/o Expanders Overview

The PCA9674D,518 is an NXP Semiconductors remote 8-bit I/O expander for the Fast-mode Plus (Fm+) I2C-bus. It provides general-purpose remote I/O expansion via a two-wire bidirectional interface operating between 2.3 V and 5.5 V. The device features eight quasi-bidirectional ports with latched outputs capable of 25 mA sink current for direct LED driving, and a total package sink capability of 200 mA. It supports a 1 MHz I2C bus speed with 30 mA SDA drive capability, allowing up to 64 programmable slave addresses using three hardware address pins. An active LOW open-drain interrupt output signals input state changes, while internal power-on reset initializes I/Os as inputs.

I/o Expanders Feature Summary

• Fast-mode Plus I2C interface supporting 1 MHz data transfer rates
• High drive capability with 30 mA SDA sink for large bus loads
• Latched outputs providing 25 mA sink current for direct LED activation
• Active LOW open-drain interrupt output for efficient microcontroller notification

I/o Expanders Applications

• LED signs and displays
• Servers
• Industrial control systems
• Medical equipment
• PLCs

I/o Expanders Procurement Notes

Verify the specific ordering suffix '518' corresponds to the SO16 package in reel packing configuration. Confirm that the component matches the standard marking requirements for the SO16 plastic small outline package. Ensure the supply voltage range and temperature specifications align with the target application environment before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when high-speed I2C communication at 1 MHz is required alongside significant output drive capabilities. It serves as a suitable upgrade for legacy PCF8574 designs needing increased bus drive strength and expanded addressing options. Consider the SO16 package constraints and ensure adequate thermal management if utilizing the full 200 mA package sink capability simultaneously across all ports.

I/o Expanders Part Context

This part belongs to the PCA9674/PCA9674A family of remote I/O expanders designed for Fm+ I2C-bus applications. It functions as a direct replacement for older PCF8574 series devices, offering improved performance metrics such as higher bus speeds and greater current drive capabilities. The family allows for extensive system scaling by supporting up to 126 devices on a single bus without requiring additional buffering.

I/o Expanders Replacement Considerations

The PCA9674D,518 is functionally compatible with the PCF8574 series but offers enhanced electrical characteristics. When replacing legacy components, verify that the system can support the 1 MHz Fast-mode Plus speed and that the 5.5 V tolerant I/Os are compatible with existing logic levels.