PCF8574RGTR

I/o Expanders Overview

The PCF8574RGTR 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) and three hardware address inputs (A0–A2). It utilizes a 16-pin VQFN package with dimensions of 3 mm × 3 mm. The operating temperature range spans from -40 °C to 85 °C, with a maximum standby current consumption of 10 μA.

I/o Expanders Feature Summary

• Provides general-purpose remote I/O expansion via the two-line bidirectional I2C interface
• Features latched outputs with high-current drive capability suitable for directly driving LEDs
• Includes an open-drain interrupt output that triggers on rising or falling edges of port inputs

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and tape-and-reel specifications. Ensure the component meets RoHS compliance requirements for your target market. Confirm thermal resistance values align with your PCB layout and ambient operating conditions before finalizing procurement.

I/o Expanders Selection Notes

Select this component when expanding microcontroller GPIO resources using the I2C protocol. It is suitable for applications requiring low standby power and direct LED driving capabilities. Ensure the system voltage falls within the 2.5 V to 6 V range and that the I2C bus capacitance does not exceed 400 pF for standard-mode operation.

I/o Expanders Part Context

This device belongs to the PCF8574 family of I/O expanders designed for low-cost GPIO expansion. It shares functional similarities with other variants in the series but differs in packaging and pin count. The RGT suffix specifically denotes the 16-pin Very Thin Quad Flat No-Lead package, distinguishing it from SOIC, TSSOP, or 20-pin VQFN variants.

I/o Expanders Replacement Considerations

Compatible substitutes include the PCF8574APWRG4 and PCF8574DGVR. Verify pin compatibility and electrical characteristics such as supply voltage and current drive capabilities before substitution.