TCAL9538PWR

Overview

The Texas Instruments TCAL9538PWR is an 8-bit I2C and SMBus I/O expander housed in a 16-pin TSSOP package. It operates within a supply voltage range of 1.08V to 3.6V and supports clock frequencies up to 1MHz (Fast-mode Plus). The device features configurable input/output ports with programmable drive strength, internal pull-up/pull-down resistors, and polarity inversion registers. It includes an active-low reset input and an open-drain interrupt output. Operating temperatures range from -40°C to +125°C.

Feature Summary

• Agile I/O configuration with programmable drive strength and internal pull-up/pull-down resistors
• Hardware address selection allowing multiple devices on a single bus
• Active-low hardware reset and latched open-drain interrupt output

Applications

• Servers
• Routers and telecom switching equipment
• Personal computers and electronics
• Industrial automation systems
• Gaming consoles

Procurement Notes

Verify the specific ordering suffix 'PWR' corresponds to the TSSOP-16 package and tape-and-reel delivery format as defined in the manufacturer's orderable information. Confirm that the component meets RoHS compliance requirements for your target market. Ensure the procurement source provides valid traceability documentation consistent with Texas Instruments production standards.

Selection Notes

Select this component when system design requires expansion of GPIO pins via I2C or SMBus interfaces under low-voltage conditions. The wide operating temperature range and high ESD protection ratings make it suitable for industrial and consumer applications. Verify that the required number of inputs and outputs aligns with the eight available ports before finalizing the design.

Part Context

The TCAL9538 belongs to the Agile I/O family designed to optimize speed, power consumption, and electromagnetic interference. Unlike standard expanders, it offers granular control over port characteristics through dedicated configuration registers. This series targets applications where processor pin counts are limited but flexible peripheral interfacing is necessary.

Replacement Considerations

Check the official datasheet for direct pin-to-pin compatible alternatives within the same product family. Substitutes may include variants with different packaging options such as UQFN or X2QFN, provided the electrical specifications and interface protocols remain identical.