PCA9534DWG4

I/o Expanders Overview

The PCA9534DWG4 is an 8-bit I/O expander from Texas Instruments designed for I2C and SMBus applications. It operates within a supply voltage range of 2.3 V to 5.5 V, supporting 5 V tolerant I/Os. The device features a maximum clock frequency of 400 kHz and includes an active low interrupt output with polarity inversion capabilities. It incorporates internal power-on reset logic and noise filters on SCL/SDA inputs to ensure reliable operation. The component is housed in a 16-pin SOIC package and functions as a remote GPIO expansion solution for various digital interfaces.

I/o Expanders Feature Summary

• Provides 8 bits of general-purpose parallel input/output expansion via I2C/SMBus interface
• Features an active low interrupt output with configurable polarity inversion register
• Includes internal power-on reset mechanism and input noise filters for signal integrity

I/o Expanders Applications

• ACPI power switch control systems
• Sensor interface expansion
• Pushbutton and LED matrix scanning

I/o Expanders Procurement Notes

Verify the specific datasheet revision and package marking for the DWG4 suffix to confirm pinout compatibility. Ensure the design supports the required 2.3 V to 5.5 V operating range and 400 kHz bus speed. Confirm that the interrupt output polarity matches the system requirements due to the available polarity inversion feature.

I/o Expanders Selection Notes

Select this component when 8 additional I/O lines are needed for I2C-based systems requiring interrupt-driven responses. It is suitable for designs needing 5 V tolerance on I/O pins while operating at lower core voltages. Consider the SOIC-16 package constraints and the need for external pull-up resistors on the I2C bus lines.

I/o Expanders Part Context

This part belongs to the PCA9534 family of low-power I/O expanders. It shares functional similarities with the TCA9534 series but may differ in specific electrical characteristics or packaging options. The 'G4' suffix typically indicates lead-free and RoHS-compliant manufacturing standards consistent with Texas Instruments' product lifecycle policies.

I/o Expanders Replacement Considerations

The PCA9534DWR is a direct pin-compatible alternative within the same family. Verify if the TCA9534 series offers necessary voltage range adjustments or package variations for the specific application environment.