PCA9655EDWR2G

I/o Expanders Overview

The PCA9655EDWR2G is a low-voltage, high-speed I2C-bus and SMBus compatible I/O expander manufactured by onsemi. It provides 8 bits of general-purpose parallel input/output expansion within a TSSOP-24 package. The device operates with a supply voltage range of 1.65 V to 5.5 V and supports data transfer rates up to 1 MHz in Fast-mode Plus. Key electrical characteristics include an operating supply current of 100 uA, output drive capability of 50 mA, and power dissipation of 600 mW. It features ESD protection rated at 3 kV and functions reliably across a temperature range of -55 C to +125 C.

I/o Expanders Feature Summary

• Provides 8-bit general-purpose parallel I/O expansion for I2C-bus and SMBus applications
• Supports high-speed communication with a maximum clock frequency of 1 MHz
• Includes interrupt output functionality to signal state changes to the system controller

I/o Expanders Applications

• General purpose I/O expansion in embedded systems
• Interface extension for sensors and push buttons
• Control of LEDs and fans in compact designs

I/o Expanders Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status via official documentation. Check lifecycle status as obsolescence may impact long-term availability. Validate package integrity upon receipt. Ensure storage conditions meet specified moisture sensitivity levels before soldering.

I/o Expanders Selection Notes

Select this component when 8-bit I/O expansion is required alongside high-speed I2C communication. Verify that the 1.65 V to 5.5 V supply voltage range matches the system design. Consider the TSSOP-24 package constraints for PCB layout. Ensure the 50 mA output drive capability meets load requirements without external drivers.

I/o Expanders Part Context

This part belongs to the PCA9655E series of I/O expanders from onsemi. It is designed to enhance system flexibility by adding parallel I/O ports via a serial interface. The device complements other interface ICs by providing simple GPIO expansion for microcontrollers lacking sufficient native pins.

I/o Expanders Replacement Considerations

Check for pin-compatible alternatives within the same family. Verify register compatibility if replacing software-dependent components. Confirm electrical specifications match the original design requirements.