TCAL9538RSVR

Overview

The TCAL9538RSVR 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 I2C clock frequencies up to 1 MHz (Fast-mode Plus) and features hardware address selection via A0 and A1 pins, allowing four devices on the same bus. The device includes an active-low reset input and an open-drain interrupt output. Key electrical parameters include a typical standby current of 1 µA at 1.8 V and ESD protection ratings of ±4000 V (Human-body model) and ±1000 V (Charged-device model). It operates over an ambient temperature range of -40°C to +125°C and is housed in a UQFN-16 package.

Feature Summary

• Agile I/O configuration with programmable drive strength, pull-up/pull-down resistors, and push-pull or open-drain output modes.
• Hardware-selectable addressing allows multiple units to share a single I2C or SMBus interface.
• Active-low reset pin enables system re-initialization, while the INT pin signals input state changes to the controller.

Applications

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

Procurement Notes

Verify the specific ordering suffix RSVR corresponds to the UQFN-16 package variant during acquisition. Confirm that the supplier provides official datasheets matching Texas Instruments documentation SCPS280B. Ensure compliance with RoHS directives as specified in the manufacturer's product information before finalizing procurement orders.

Selection Notes

Select this component when designs require low-voltage operation below 1.65 V or demand high-speed communication up to 1 MHz. It is suitable for applications needing configurable I/O drive strengths and internal pull resistors to reduce external component count. Verify that the UQFN-16 package dimensions fit the available PCB real estate constraints.

Part Context

This part belongs to the TCAL9538 family of remote I/O expanders from Texas Instruments. It shares functional similarities with the TCA9538 series but is optimized for lower voltage ranges and higher speed interfaces. The RS designation indicates the specific UQFN packaging style used for compact surface-mount applications.

Replacement Considerations

The TCA9538 series offers similar functionality but typically supports a wider voltage range up to 5.5 V and lower maximum clock speeds. Verify compatibility regarding operating voltage limits and I2C timing requirements when substituting these parts.