PCF8574ANE4

I/o Expanders Overview

The PCF8574ANE4 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 latched outputs with high-current drive capability. It is housed in a 16-pin PDIP package and functions across a temperature range of -40°C to +85°C.

I/o Expanders Feature Summary

• Provides remote I/O expansion via the two-line bidirectional I2C interface
• Features quasi-bidirectional I/O ports that require no data-direction control signal
• Includes an open-drain interrupt output triggered by port input changes

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'E4' against the manufacturer's current orderable addendum to confirm package type and compliance status. Ensure the procurement source provides the official datasheet SCPS069H for accurate pin configuration and electrical specifications before integration.

I/o Expanders Selection Notes

Select this component when expanding microcontroller I/O capabilities using the I2C protocol. It is suitable for applications requiring direct LED driving due to its high-current latch outputs. Verify that the system power supply remains within the 2.5 V to 6 V operating range and that the I2C bus capacitance does not exceed 400 pF.

I/o Expanders Part Context

This part belongs to the PCF8574A family of remote 8-bit I/O expanders. It shares functional characteristics with other variants in the series but differs in physical packaging. The 'N' suffix typically denotes the PDIP-16 package, while 'E4' indicates environmental compliance attributes defined by the manufacturer.

I/o Expanders Replacement Considerations

PCF8574AN

I/o Expanders FAQ

How is the interrupt signal reset?

The interrupt circuit resets when data on the port generating the interrupt is changed to its original setting or when data is read from or written to that specific port.

What is the state of the I/Os at power-on?

At power-on, all I/Os are high, activating only a current source to VCC until they are configured otherwise.

Can the I/Os be used as inputs without direction signals?

Yes, each quasi-bidirectional I/O can function as an input or output without requiring a separate data-direction control signal.