PCF8575CDBQR

I/o Expanders Overview

The PCF8575CDBQR is a remote 16-bit I2C and SMBus I/O expander manufactured by Texas Instruments. It provides general-purpose digital input and output expansion via the I2C bus interface. The device operates within a supply voltage range of 2.5 V to 5.5 V and supports clock frequencies up to 400 kHz. It features an interrupt output pin to signal data changes to the host microcontroller. The component is housed in a 24-pin TSSOP package and is rated for operation across an industrial temperature range from -40°C to +85°C.

I/o Expanders Feature Summary

• Provides 16 bidirectional I/O lines accessible through a two-wire I2C serial interface.
• Includes an active-low interrupt output (INT) that triggers when any port pin state differs from its last known value.
• Supports multiple slave addresses allowing up to eight devices on a single I2C bus without external logic.

I/o Expanders Applications

• Industrial control systems requiring additional GPIO for sensor interfacing or relay driving.
• Consumer electronics with limited microcontroller pins needing expansion for keypads or displays.
• Embedded systems utilizing SMBus communication for low-power peripheral management.

I/o Expanders Procurement Notes

Verify the specific suffix 'CDBQR' against the manufacturer's current datasheet to confirm package type, tape-and-reel specifications, and RoHS compliance status. Ensure the operating voltage requirements of your system align with the 2.5 V to 5.5 V range specified for this variant. Cross-reference the part number with authorized distributors to confirm availability and lead times.

I/o Expanders Selection Notes

Select this component when a design requires expanding 16 digital I/O lines using a standard I2C interface. It is suitable for applications where interrupt-driven notifications are preferred over polling. Consider the TSSOP-24 package constraints for PCB layout. Verify that the target system's I2C pull-up resistors and voltage levels are compatible with the device's logic thresholds.

I/o Expanders Part Context

The PCF8575CDBQR belongs to the PCF8575 family of remote 16-bit I/O expanders. This series is designed to simplify system expansion by adding ports via the I2C bus. The 'C' designation typically indicates a commercial or specific grade variant within the TI portfolio, while 'DBQR' specifies the TSSOP-24 package and reel packaging configuration.

I/o Expanders Replacement Considerations

Compatible alternatives include the PCA9535 and PCA9555, which offer similar 16-bit I2C functionality but may include configuration registers for pin direction setting. The PCF8574A serves as a replacement if only 8 bits are required. Verify pin compatibility and register mapping before substituting these parts.