PCF8574AN

I/o Expanders Overview

The PCF8574AN is an 8-bit I/O expander for the two-line bidirectional I2C bus, designed for operation between 2.5 V and 6 V supply voltage. It features eight quasi-bidirectional ports (P0–P7) with latched outputs capable of directly driving LEDs. The device includes three hardware address inputs (A0–A2) to support multiple devices on a single bus and provides an open-drain interrupt output (INT). Operating within a temperature range of -40°C to +85°C, it supports a maximum clock frequency of 100 kHz. The component utilizes a 16-pin PDIP package.

I/o Expanders Feature Summary

• Provides remote I/O expansion via standard I2C interface
• Features quasi-bidirectional ports without data-direction control signals
• Includes open-drain interrupt output for event notification
• Offers high-current drive capability for direct LED activation

I/o Expanders Applications

• Telecom shelters: filter units
• Servers and routers
• Personal computers
• Industrial automation systems
• Products with GPIO-limited processors

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'AN' corresponds to the Texas Instruments PDIP-16 package variant. Confirm that the manufacturer designation matches the official datasheet documentation. Ensure compliance with RoHS standards as specified in the product information. Validate the part number against the original equipment manufacturer's catalog to avoid counterfeit components.

I/o Expanders Selection Notes

Select this component when expanding microcontroller I/O capabilities using the I2C protocol. It is suitable for applications requiring low standby current consumption and direct LED driving. Consider the 16-pin PDIP package for through-hole mounting requirements. Ensure the system voltage falls within the 2.5 V to 6 V operating range.

I/o Expanders Part Context

This device belongs to the PCF8574A series of remote I/O expanders. It shares functional similarities with other members of the family but differs in packaging and specific electrical characteristics. The 'AN' suffix specifically denotes the plastic dual-in-line package configuration offered by Texas Instruments.

I/o Expanders Replacement Considerations

PCF8574APWRG4

I/o Expanders FAQ

How are the I/O ports configured?

Each quasi-bidirectional I/O port can be used as an input or output without a data-direction control signal. At power-on, the I/Os are high.

What is the function of the INT pin?

The INT pin is an open-drain output that generates an interrupt signal when any port input changes state, allowing the microcontroller to monitor events without polling.

Can this device drive LEDs directly?

Yes, the latched outputs have high-current drive capability designed for directly driving LEDs.