PCA9555DBR

I/o Expanders Overview

The PCA9555DBR 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 interface, supporting standard and fast modes up to 400 kHz. The device operates within a supply voltage range of 2.3 V to 5.5 V and features an interrupt output pin for efficient event handling. It is housed in a 24-pin SSOP package and is designed for surface-mount installation. The component includes configuration registers to set individual I/O directions and supports power-on reset functionality.

I/o Expanders Feature Summary

• Provides 16-bit I/O expansion through I2C and SMBus serial interfaces
• Includes dedicated interrupt output pin for asynchronous status signaling
• Features configurable direction control via internal configuration registers

I/o Expanders Applications

• Portable devices requiring additional GPIO pins
• Industrial control systems with limited microcontroller ports
• Consumer electronics utilizing I2C bus architectures

I/o Expanders Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and tape/reel specifications. Ensure compatibility with system voltage levels and I2C bus speed requirements before procurement. Check for recent product change notifications regarding manufacturing site or material composition updates.

I/o Expanders Selection Notes

Select this component when 16 bidirectional I/O lines are required on an I2C bus. Confirm that the host controller supports the necessary I2C clock frequencies and pull-up resistor configurations. Verify that the SSOP-24 package dimensions fit the available PCB real estate and thermal constraints.

I/o Expanders Part Context

This part belongs to the PCA9555 family of 16-bit I/O expanders. Variants such as PCA9555DWR offer the same electrical functionality but utilize a SOIC-24 package instead of SSOP. The DBR suffix typically indicates a reel-based packaging format suitable for automated surface-mount assembly processes.

I/o Expanders Replacement Considerations

The PCA9555DWR serves as a functional equivalent with identical electrical characteristics but differs in physical package (SOIC vs. SSOP). Direct pin-to-pin replacement requires verifying footprint compatibility. Other family members like TCA9555DBR may offer extended voltage ranges.