PCF8575CDB

I/o Expanders Overview

The PCF8575CDB is a remote 16-bit I2C and SMBus low-power I/O expander manufactured by Texas Instruments. It provides general-purpose digital input and output expansion for microcontroller systems via a two-wire bidirectional bus. 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, open-drain outputs with high current drive capabilities suitable for direct LED driving, and hardware-configurable address pins allowing up to eight devices on the same bus. The component is housed in a 24-pin SSOP package and functions across an industrial temperature range.

I/o Expanders Feature Summary

• Provides 16-bit remote I/O expansion through standard I2C and SMBus interfaces
• Features an interrupt output line to signal external events without continuous polling
• Includes hardware address selection pins to support multiple devices on a single bus
• Offers high-current latch outputs capable of directly driving LEDs

I/o Expanders Applications

• Microcontroller port expansion in embedded control systems
• Direct LED indicator and display driving applications
• SMBus compatible sensor and actuator interface modules
• Remote input/output monitoring in industrial automation panels

I/o Expanders Procurement Notes

Verify the specific suffix against the manufacturer's official documentation to confirm package type and electrical specifications. Ensure the selected variant matches the required operating temperature range and voltage levels for the target application design.

I/o Expanders Selection Notes

Select this component when 16-bit expansion is required over an I2C bus with interrupt capability. Compare power consumption requirements against other family members if lower standby current is critical. Confirm that the SSOP package dimensions fit the available PCB footprint constraints.

I/o Expanders Part Context

This part belongs to the PCF8575 family of I/O expanders from Texas Instruments. It shares functional similarities with variants like the PCF8575CDWR and PCF8575PW but differs in physical packaging. The family is designed for low-power applications requiring simple serial interface expansion.

I/o Expanders Replacement Considerations

Compatible substitutes include PCF8575CDWR and PCF8575PWRE4. Verify pin compatibility and package dimensions before substitution. Other families such as PCA9535 or TCA9539 may offer similar functionality but require interface verification.