TCAL9538DTUR

Overview

The TCAL9538DTUR is an 8-bit I2C and SMBus I/O expander designed for operation within a supply voltage range of 1.08 V to 3.6 V. It supports clock frequencies up to 1 MHz (Fast-mode Plus) and features Agile I/O ports with programmable drive strength, pull-up/pull-down resistors, and configurable open-drain or push-pull outputs. The device includes hardware address pins allowing four units on one bus, an active-low reset input, and an interrupt output. It operates from -40°C to +125°C and is housed in a 16-pin X2QFN package.

Feature Summary

• Agile I/O configuration with programmable drive strength and internal pull-up/pull-down resistors
• Supports Standard-mode, Fast-mode, and Fast-mode Plus I2C/SMBus protocols
• Hardware-selectable addressing allows multiple devices on the same bus
• Active-low reset input and latched open-drain interrupt output

Applications

• Servers and routers
• Personal computers and electronics
• Industrial automation systems
• Gaming consoles
• Products with GPIO-limited processors

Procurement Notes

Verify the DTUR suffix corresponds to the X2QFN-16 package and tape-and-reel delivery format. Confirm the specific revision level matches the design requirements. Ensure the operating environment stays within the specified voltage and temperature limits. Check for any recent product change notifications that might affect pinout or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when ultra-low voltage operation below 1.65 V is required, as standard TCA9538 variants do not support voltages down to 1.08 V. Choose the DTUR package variant for compact board space constraints due to its small footprint. Consider the Agile I/O features if programmable drive strength or internal pull-ups are needed to reduce external components.

Part Context

The TCAL9538 belongs to Texas Instruments' Agile I/O family, distinct from the TCA9538 series which typically starts at 1.65 V. While functionally similar regarding I2C expansion, the TCAL9538 offers extended low-voltage capability and enhanced I/O configurability. The DTUR suffix specifically denotes the X2QFN package type, differentiating it from TSSOP or UQFN variants like TCAL9538PWR or TCAL9538RSVR.

Replacement Considerations

TCAL9538PWR (TSSOP-16), TCAL9538RSVR (UQFN-16). Note that TCA9538 variants have a higher minimum voltage of 1.65 V and lack some Agile I/O features.