PCA9673D,118

I/o Expanders Overview

The PCA9673D,118 is a remote 16-bit I/O expander for Fast-mode Plus I2C-bus with interrupt and reset. It provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I2C-bus) and is a part of the Fast-mode Plus family. The device consists of a 16-bit quasi-bidirectional port and an I2C-bus interface. The PCA9673 has a low current consumption and includes latched outputs with 25 mA high current drive capability for directly driving LEDs. It also possesses an interrupt line (INT) which can be connected to the interrupt logic of the microcontroller. The internal Power-On Reset (POR), hardware reset pin (RESET) or software reset sequence initializes the I/Os as inputs.

I/o Expanders Feature Summary

• 1 MHz I2C-bus interface compliant with I2C-bus Fast and Standard modes
• SDA with 30 mA sink capability for 4000 pF buses
• 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os
• 16-bit remote I/O pins that default to inputs at power-up

I/o Expanders Applications

• LED signs and displays
• Servers
• Industrial control
• Medical equipment
• PLCs

I/o Expanders Procurement Notes

Verify the ordering suffix '118' against official NXP documentation to confirm tape and reel packaging specifications. Ensure the SO24 package variant matches the required board layout dimensions. Cross-reference the manufacturer date code and lot traceability requirements with the specific project quality standards before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when a drop-in upgrade for PCF8575 is needed with higher Fm+ I2C-bus speeds up to 1 MHz. Choose it for applications requiring higher I2C-bus drive of 30 mA to support more devices without bus buffers. Opt for this part if a total package sink capacity of 400 mA is required to support multiple simultaneous LED loads. Consider the availability of 16 programmable slave addresses to prevent address conflicts in complex systems.

I/o Expanders Part Context

The PCA9673D,118 belongs to the PCA9673 series of remote I/O expanders designed for Fast-mode Plus I2C-bus applications. It serves as a direct replacement for older 8-bit expanders but offers 16-bit expansion capabilities. The D suffix indicates the SO24 plastic small outline package with a body width of 7.5 mm. This series integrates interrupt and reset functionalities to enhance system responsiveness and reliability in embedded designs.

I/o Expanders Replacement Considerations

PCA9673D is a drop-in upgrade for PCF8575. Verify pin compatibility as A2 address pin on PCF8575 is replaced by RESET input on PCA9673.