PCF8574DGVR

I/o Expanders Overview

The PCF8574DGVR is an 8-bit remote 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 eight quasi-bidirectional I/O ports (P0–P7) with latched outputs capable of directly driving LEDs. It includes an open-drain interrupt output (INT) and three hardware address inputs (A0–A2). The component functions across a temperature range of -40 °C to +85 °C and utilizes a TVSOP-20 package.

I/o Expanders Feature Summary

• Provides general-purpose remote I/O expansion via the two-wire bidirectional I2C interface
• Features latched outputs with high-current drive capability for direct LED activation
• Includes an open-drain interrupt output triggered by rising or falling edges on 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 'DGVR' against the manufacturer's current datasheet to confirm the TVSOP-20 package type and tape-and-reel delivery format. Ensure the selected variant matches the required operating temperature range and voltage specifications for the target application environment.

I/o Expanders Selection Notes

Select this component when system design requires expanding GPIO capabilities using the I2C protocol. It is suitable for microcontroller families needing additional input/output lines without consuming extra processor pins. Consider the low standby current consumption for battery-powered applications requiring efficient power management.

I/o Expanders Part Context

This device belongs to the PCF8574 series of remote I/O expanders designed for I2C communication. It serves as a peripheral interface solution, allowing systems to manage multiple devices over a serial bus while minimizing pin usage on the main controller.

I/o Expanders Replacement Considerations

PCF8574RGTRG4

I/o Expanders FAQ

How is the interrupt signal generated?

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

What is the function of the A0, A1, and A2 pins?

These are hardware address inputs used to configure the I2C target address, allowing up to eight devices to operate on the same bus.

Can the I/O ports be used as both inputs and outputs simultaneously?

No, each quasi-bidirectional I/O can be independently assigned as either an input or an output, but not both at the same time.