TCA9548ARGER

Overview

The TCA9548ARGER is an eight-channel I2C bus switch manufactured by Texas Instruments, designed to resolve address conflicts and enable hierarchical bus expansion. It operates within a supply voltage range of 1.65 V to 5.5 V and supports bidirectional translating switches with a maximum on-resistance of 70 Ohms. The device features a reset function and functions as a multiplexer switch IC in a 24-pin VQFN package. It maintains operation across a temperature range of -40°C to +85°C with a maximum power supply current of 80 uA.

Feature Summary

• Provides eight independent bidirectional channels for routing I2C signals between a host controller and downstream devices.
• Includes a dedicated reset pin to ensure the device initializes into a known state upon power-up or system recovery.
• Supports flexible addressing via external pins, allowing multiple units to be cascaded for expanded network topologies.

Applications

• Resolving I2C address conflicts when connecting multiple identical peripheral sensors to a single microcontroller interface.
• Hierarchical I2C bus expansion to increase the number of accessible slave devices beyond standard bus limits.
• System design requiring isolation between different I2C sub-buses to prevent signal interference.

Procurement Notes

Verify the specific suffix 'ARG' against the manufacturer's official documentation to confirm the exact package variant and tape-and-reel specifications. Ensure the selected component matches the required operating temperature range and voltage levels for your target application environment before finalizing procurement.

Selection Notes

Select this component when an embedded system requires logical separation of I2C buses without modifying slave device addresses. It is suitable for designs needing a low-power solution with a wide supply voltage compatibility. Consider the VQFN-24 footprint constraints and thermal requirements during the PCB layout phase to ensure reliable signal integrity.

Part Context

This part belongs to the TCA9548A series of I2C bus switches from Texas Instruments. It serves as a functional replacement for legacy components like the PCA9548A, offering similar switching capabilities but potentially differing in electrical characteristics such as minimum supply voltage and package type. It is widely used in industrial and consumer electronics for bus management.

Replacement Considerations

The PCA9548ADGVR is a documented alternative within the same family, though it utilizes a TVSOP-24 package and has a higher minimum operating voltage of 2.3 V compared to the TCA9548ARGER's 1.65 V. Verify pinout compatibility and voltage thresholds before substitution.