PCF8574ADWG4

I/o Expanders Overview

The PCF8574ADWG4 is an 8-bit I/O expander for the I2C bus, manufactured by Texas Instruments. It operates within a supply voltage range of 2.5 V to 6 V and supports a maximum clock frequency of 100 kHz. The device features an open-drain interrupt output and quasi-bidirectional I/O ports with latched outputs capable of driving LEDs directly. It functions across a temperature range from -40°C to +85°C and is housed in a TSSOP-20 package.

I/o Expanders Feature Summary

• Provides remote I/O expansion via the I2C interface without requiring data-direction control signals
• Features latched outputs with high-current drive capability suitable for direct LED driving
• Includes an open-drain interrupt output triggered by any rising or falling edge on port inputs

I/o Expanders Applications

• Telecom shelters including filter units
• Servers and routers for telecom switching equipment
• Personal computers and personal electronics
• Industrial automation systems
• Products utilizing GPIO-limited processors

I/o Expanders Procurement Notes

Verify that the ordering suffix 'DWG4' corresponds to the TSSOP-20 package and lead-free construction as specified in the manufacturer's documentation. Confirm RoHS compliance status through official datasheets or component databases before procurement. Ensure the specific revision level matches system requirements.

I/o Expanders Selection Notes

Select this component when an 8-bit I/O expansion solution is required for microcontrollers using the I2C protocol. The device is suitable for applications needing low standby current and direct LED driving capabilities. Verify that the operating voltage range of 2.5 V to 6 V aligns with the system power supply constraints.

I/o Expanders Part Context

The PCF8574A series serves as a general-purpose remote I/O expander designed for most microcontroller families. It expands system capabilities by converting I2C serial data into parallel I/O signals. The device simplifies design by eliminating the need for dedicated data-direction control signals for its quasi-bidirectional ports.

I/o Expanders Replacement Considerations

PCF8574APWRG4 (TSSOP-16) offers electrical compatibility but requires PCB redesign due to pin count differences. PCF8574AN provides identical functionality in a PDIP-16 package. TCA9534 is a push-pull alternative with similar I/O counts but different output drive characteristics.