PCA9554DWR

I/o Expanders Overview

The PCA9554DWR is an obsolete 8-bit I/O expander from Texas Instruments, designed for I2C and SMBus communication with a maximum clock frequency of 400 kHz. It operates within a supply voltage range of 2.3 V to 5.5 V and features push-pull outputs capable of sourcing or sinking up to 10 mA or 25 mA respectively. The device includes an interrupt output and power-on reset (POR) functionality. It is housed in a 16-SOIC package with a wide operating temperature range of -40°C to +85°C.

I/o Expanders Feature Summary

• Supports standard I2C and SMBus protocols for system integration
• Provides configurable interrupt output for efficient event handling
• Includes internal configuration registers for flexible pin assignment

I/o Expanders Applications

• Portable devices requiring extended GPIO capabilities
• Industrial control systems utilizing I2C/SMBus interfaces
• Consumer electronics needing additional input/output lines

I/o Expanders Procurement Notes

This component is officially discontinued and no longer manufactured by Texas Instruments. Verification of availability should focus on approved replacement parts such as the TCA9554 series. Ensure that any substitute components meet the original electrical specifications and package requirements before implementation.

I/o Expanders Selection Notes

Designers should transition to the TCA9554 family, which offers enhanced performance and lower supply voltage options. The TCA9554 supports operation down to 1.65 V, providing greater flexibility for low-voltage applications compared to the 2.3 V minimum of the PCA9554. Package compatibility remains consistent across the SOIC-16 form factor.

I/o Expanders Part Context

The PCA9554 belongs to the broader PCA9554/PCA9554A family of 8-bit I/O expanders. This series is widely used in embedded systems where microcontroller pins are limited. The DW suffix indicates a 16-pin Small Outline Integrated Circuit (SOIC) package with a 7.50 mm width, suitable for surface-mount assembly.

I/o Expanders Replacement Considerations

The TCA9554DWR and TCA9554PWR are manufacturer-recommended replacements. These parts maintain functional compatibility while offering improved electrical characteristics and continued production status.