PCF8574ADGVR

I/o Expanders Overview

The PCF8574ADGVR 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 TVSOP-20 package and functions across a temperature range from -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 operate without data-direction control signals
• Includes an open-drain interrupt output triggered by port input changes

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' corresponds to the TVSOP-20 package configuration. Confirm the component meets RoHS compliance requirements for your manufacturing process. Ensure the datasheet revision matches the design specifications before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when GPIO expansion is required on standard-mode I2C buses. The TVSOP-20 package offers a compact footprint suitable for space-constrained designs. Verify that the system voltage falls within the 2.5 V to 6 V operating range and that the load current requirements do not exceed the specified drive capabilities.

I/o Expanders Part Context

This part belongs to the PCF8574A family of remote 8-bit I/O expanders. The 'DGV' prefix indicates the TVSOP-20 package variant, while 'R' typically denotes tape-and-reel packaging. This distinguishes it from other package options like SOIC or TSSOP available within the same logical device family.

I/o Expanders Replacement Considerations

PCF8574APWRG4

I/o Expanders FAQ

How is the interrupt signal reset?

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

What is the default 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 a direction control signal?

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