PCA9535DB

I/o Expanders Overview

The PCA9535DB is a 16-bit I/O expander designed for I2C and SMBus interfaces, manufactured by Texas Instruments. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features an interrupt output capability and includes configuration registers for pin direction control. Packaged in a 24-pin SOIC format, it provides open-drain outputs with a sink current capacity of 25 mA per pin. The component is rated for operation between -40°C and +85°C, offering robust performance for industrial applications requiring extended GPIO expansion.

I/o Expanders Feature Summary

• Provides 16-bit general-purpose parallel I/O expansion via standard I2C or SMBus protocols
• Includes dedicated interrupt output pin to signal state changes on input ports
• Features configurable configuration registers allowing individual pin direction setting

I/o Expanders Applications

• Industrial control systems requiring remote I/O expansion
• Consumer electronics utilizing low-power interface protocols
• Embedded systems needing additional GPIO pins for peripheral management

I/o Expanders Procurement Notes

Verify the specific suffix 'DB' corresponds to the SOIC-24 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure compatibility with system voltage levels ranging from 2.3 V to 5.5 V. Check for end-of-life notifications as this part number may have limited availability compared to newer revisions.

I/o Expanders Selection Notes

Select this component when a 16-bit I/O solution is required with I2C/SMBus connectivity. Compare against TCA9535 if lower voltage operation down to 1.65 V is necessary. Consider alternative packages like DWR or PWR based on PCB space constraints. Verify that the 25 mA output drive capability meets load requirements without external buffering.

I/o Expanders Part Context

This device belongs to the PCA9535 family of low-power I/O expanders. It serves as a bridge between microcontrollers and peripheral devices, effectively increasing the number of available digital inputs and outputs. The DB suffix specifically denotes the SOIC-24 surface-mount package, distinguishing it from other form factors within the same functional series.

I/o Expanders Replacement Considerations

The TCA9535DBT offers similar functionality but supports a wider voltage range starting at 1.65 V. For direct package substitution, verify pin-to-pin compatibility with the TCA9535DW. Other family members like PCA9535DWR provide identical electrical characteristics in different packaging.