PCA9674ABS,118

I/o Expanders Overview

The PCA9674ABS,118 is an 8-bit I/O expander for the Fast-mode Plus (Fm+) I2C bus. It operates between 2.3 V and 5.5 V with 5.5 V tolerant I/Os. The device features latched outputs with a 25 mA sink capability per pin and a total package sink capability of 200 mA. It supports a 1 MHz I2C interface with SDA capable of 30 mA sink current. Sixty-four programmable slave addresses are available via three hardware address pins. The typical static supply current is 4.5 µA. It includes an active LOW open-drain interrupt output and operates from -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides remote I/O expansion via a two-wire bidirectional I2C-bus interface.
• Features latched outputs with high current sink capability for direct LED driving.
• Includes an active LOW open-drain interrupt output for efficient input state monitoring.
• Supports software reset and readable device identification fields.

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

I/o Expanders Selection Notes

Select this component when high-speed Fm+ communication at 1 MHz is required alongside significant drive strength. The 25 mA per-pin sink capability allows direct LED interfacing without external transistors. Ensure the system voltage falls within the 2.3 V to 5.5 V range and that the application benefits from the low standby current consumption.

I/o Expanders Part Context

This part belongs to the PCA9674/PCA9674A family of remote I/O expanders. It serves as a functional upgrade to the PCF8574 series, offering higher bus speeds and drive currents. The 'ABS' designation indicates the HVQFN16 package variant. It shares architectural similarities with other NXP I2C expanders but distinguishes itself through its specific address map and enhanced electrical characteristics.

I/o Expanders Replacement Considerations

The PCA9674A is the primary alternative within the same datasheet, featuring non-overlapping addresses. For legacy compatibility, the PCF8574 or PCA8574 may be considered, though they offer lower speed and drive capabilities. Verify address conflicts if mixing these devices on the same bus.

I/o Expanders FAQ

How many unique slave addresses can be configured for the PCA9674?

The PCA9674 supports 64 programmable slave addresses using three hardware address pins (AD0, AD1, AD2).

What is the function of the INT pin?

The INT pin is an active LOW open-drain interrupt output. It signals the microcontroller when any input state differs from its corresponding input port register state, eliminating the need for continuous polling.

Can the PCA9674 directly drive LEDs?

Yes, the latched output ports have a 25 mA sink capability per pin and a total package sink capability of 200 mA, allowing for direct LED driving.