PCF8574ADWRE4

I/o Expanders Overview

The PCF8574ADWRE4 is a remote 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 SOIC (DW) package and is designed for through-hole or surface-mount applications depending on the specific variant, though this part number indicates a tape-and-reel packaging format.

I/o Expanders Feature Summary

• Provides general-purpose remote I/O expansion via the I2C interface
• Features quasi-bidirectional I/O ports without data-direction control signals
• Includes an open-drain interrupt output for microcontroller notification
• Offers latch-up performance exceeding 100 mA per JESD 78, Class II

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the exact package type and reel quantity against the manufacturer's orderable addendum. Confirm that the 'DWRE4' suffix corresponds to the specified SOIC-16 tape and reel configuration. Ensure compatibility with existing PCB footprints and reflow profiles before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when expanding I/O capabilities for microcontrollers using the I2C protocol. It is suitable for designs requiring low standby current and direct LED driving. Consider the operating temperature range of -40°C to +85°C and the 2.5 V to 6 V supply voltage requirements during system architecture planning.

I/o Expanders Part Context

This device belongs to the PCF8574A series of I/O expanders. It shares functional similarities with other members of the family but differs in packaging and ordering suffixes. The DWRE4 designation specifically identifies the SOIC-16 package variant supplied in a tape and reel format for automated assembly processes.

I/o Expanders Replacement Considerations

PCF8574APW

I/o Expanders FAQ

How is the interrupt signal reset?

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

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

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

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

Yes, each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal.