TCAL9539RTWR

Overview

The TCAL9539RTWR is a low-voltage 16-bit I/O expander supporting I2C and SMBus protocols. It operates within a supply voltage range of 1.08 V to 3.6 V, with a typical standby current of 1 µA at 1.8 V. The device supports clock frequencies up to 1 MHz (Fast-mode Plus). It features Agile I/O ports with programmable drive strength, pull-up/pull-down resistors, latchable inputs, and maskable interrupts. The package is a 24-pin WQFN.

Feature Summary

• Agile I/O functionality for enhanced speed, power consumption, and EMI performance
• Programmable output drive strength to mitigate simultaneous switching noise
• Configurable internal pull-up and pull-down resistors
• Active-low hardware reset input and 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 suffix RTWR corresponds to the WQFN-24 package configuration. Confirm the operating voltage range matches system requirements, as this variant is limited to 3.6 V maximum. Ensure the design accounts for the lower voltage tolerance compared to standard 5.5 V tolerant I/O expanders.

Selection Notes

Select the TCAL9539RTWR when system power rails are strictly below 3.6 V. This model provides higher bus speeds up to 1 MHz compared to older variants. Verify that peripheral devices connected to the I/O ports are compatible with the 3.6 V logic levels. Consider the thermal characteristics of the WQFN package for high-density layouts.

Part Context

The TCAL9539 series expands general-purpose I/O for microcontrollers using two-wire serial interfaces. The RTWR suffix denotes the WQFN package option. This component addresses designs requiring additional GPIOs while minimizing board space and power consumption in portable or dense electronic applications.

Replacement Considerations

TCAL9539PW: TSSOP-24 package equivalent. PCAL9539A: 5.5 V tolerant version with similar features. PCA9539: Older generation without Agile I/O features.