TCA9548ADGSR

Overview

The TCA9548ADGSR is an 8-channel bidirectional translating I2C switch manufactured by Texas Instruments. It operates within a supply voltage range of 1.65V to 5.5V and supports clock frequencies up to 400kHz. The device features an active-low reset input, three hardware-selectable address pins (A0-A2), and low standby current consumption. It provides latch-up protection exceeding 100mA per JESD 78, Class II standards. The component is housed in a 24-pin VSSOP package.

Feature Summary

• Provides eight bidirectional translating switches controllable via the I2C bus for routing SCL/SDA signals.
• Supports voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses using external pull-ups.
• Includes an active-low reset input to recover from bus faults or improper operations without power cycling.
• Ensures glitch-free operation on power-up with all switch channels initially deselected.

Applications

• Servers
• Routers and telecom switching equipment
• Factory automation systems
• Resolving I2C target address conflicts among identical sensors

Procurement Notes

Verify the specific ordering suffix 'DGSR' corresponds to the VSSOP-24 package and tape-and-reel quantity as defined in the manufacturer's orderable addendum. Confirm that the device meets the required thermal and electrical specifications for the intended operating temperature range before finalizing procurement.

Selection Notes

Select this component when an I2C controller requires connection to multiple downstream devices sharing identical addresses. It is suitable for applications requiring voltage translation between different logic levels. Ensure the design accommodates the necessary external pull-up resistors for each channel to support the desired bus voltages.

Part Context

This part belongs to the TCA9548A family of low-voltage I2C switches. It shares core functionality with variants like TCA9548APWR and TCA9548ARGER but differs in packaging and reel configuration. The DGSR suffix specifically denotes the VSSOP-24 form factor optimized for surface-mount assembly.

Replacement Considerations

TCA9548APWR (TSSOP-24 package)

FAQ

How does the TCA9548ADGSR handle I2C address conflicts?

It resolves conflicts by physically isolating downstream channels. The controller selects only one channel at a time via the control register, allowing multiple devices with identical addresses to coexist on separate sub-buses.

What is the function of the RESET pin?

The active-low RESET input allows the system controller to reset the internal state machine and deselect all channels if a downstream I2C bus becomes stuck in a low state, facilitating recovery without power cycling.