PCF8574ANG4

I/o Expanders Overview

The PCF8574ANG4 is an 8-bit I/O expander for the I2C bus, operating within a supply voltage range of 2.5V to 6V. It features an 8-bit quasi-bidirectional port (P0–P7) with latched outputs capable of directly driving LEDs. The device includes an open-drain interrupt output and supports standard-mode clock frequencies up to 100 kHz. It operates across a temperature range of -40°C to +85°C and utilizes a 16-pin PDIP package.

I/o Expanders Feature Summary

• Provides remote I/O expansion via the two-line bidirectional I2C interface
• Features quasi-bidirectional I/O ports that function as inputs or outputs without data-direction control signals
• Includes an open-drain interrupt output triggered by any rising or falling edge on the port inputs

I/o Expanders Applications

• Telecom shelters: filter units
• Servers
• Routers (telecom switching equipment)
• Personal computers
• Industrial automation

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'G4' against the manufacturer's current documentation to confirm compliance status and availability details. Confirm the package type matches the required PCB footprint. Ensure the component meets all necessary environmental regulations for the intended deployment environment before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when expanding GPIO capabilities for microcontrollers using the I2C protocol. Ensure the system voltage falls between 2.5V and 6V. Verify that the required I/O count does not exceed eight pins per device. Consider the interrupt functionality if asynchronous event detection from the peripheral devices is required for the application design.

I/o Expanders Part Context

This part belongs to the PCF8574A family of remote 8-bit I/O expanders designed for I2C bus communication. It serves as a general-purpose interface solution for connecting peripherals to processors with limited I/O resources. The device simplifies system architecture by allowing multiple expansion chips to be connected on the same serial bus through address pin configuration.

I/o Expanders Replacement Considerations

PCF8574AN

I/o Expanders FAQ

How are the I/O ports configured?

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

What triggers the interrupt output?

An interrupt is generated by any rising or falling edge of the port inputs when they are in input mode.

Can the device drive LEDs directly?

Yes, the device features latched outputs with high-current drive capability suitable for directly driving LEDs.