PCA9554DB

I/o Expanders Overview

The PCA9554DB is an 8-bit I/O expander manufactured by Texas Instruments, housed in a 16-pin SSOP package. It supports I2C and SMBus interfaces with a maximum clock frequency of 400 kHz. The device operates on a supply voltage ranging from 2.3 V to 5.5 V and functions within a temperature range of -40°C to +85°C. It features push-pull outputs capable of sourcing or sinking up to 25 mA. Key specifications include interrupt output capability, power-on reset (POR) functionality, and compatibility with standard I2C addressing via hardware pins.

I/o Expanders Feature Summary

• Provides 8-bit general-purpose parallel input/output expansion for I2C bus applications
• Includes configuration registers to independently select each pin as input or output
• Features an open-drain interrupt output that activates when input states change
• Supports multiple devices on the same bus through three hardware address pins

I/o Expanders Applications

• ACPI power switch control systems
• Sensor interface expansion
• Button and LED matrix scanning
• Fan speed control interfaces

I/o Expanders Procurement Notes

Verify component authenticity and datasheet revision status before integration. Confirm package integrity and lead-free compliance against RoHS3 standards. Check for obsolescence notices or product discontinuation announcements from the manufacturer. Ensure supply chain stability due to potential end-of-life status. Validate electrical parameters against current design requirements.

I/o Expanders Selection Notes

Compare against PCA9554DW for SOIC packaging alternatives. Consider TCA9554 series variants if lower voltage operation down to 1.65 V is required. Evaluate pin-to-pin compatibility with PCF8574 series but account for necessary software modifications due to enhanced features. Verify interrupt polarity and configuration register behavior matches system logic.

I/o Expanders Part Context

This component belongs to the PCA9554 family of CMOS I/O expanders designed to enhance NXP Semiconductors' original I2C bus offerings. Texas Instruments manufactures this variant, maintaining functional compatibility while improving drive strength and reducing supply current. The device serves as a bridge between serial I2C controllers and parallel peripheral devices.

I/o Expanders Replacement Considerations

TCA9554ADBR is a recommended substitute offering similar functionality with extended voltage support down to 1.65 V. TCA9554ADBQRG4 provides alternative packaging options. Verify software compatibility when migrating to these newer generations due to potential feature enhancements.