TI TCA9548AMRGER

The TCA9548A device is equipped with eight bidirectional transfer switches that can be controlled via the I²C bus. The serial clock/serial data (SCL/SDA) upstream pair can be expanded into eight downstream pairs or channels. Based on the content of the programmable control register, any single SCn/SDn channel or a combination of channels can be selected. These downstream channels can be used to resolve I²C slave device address conflicts. For example, if eight identical digital temperature sensors are required in an application, one sensor can be connected to each channel (0 - 7). In case of a timeout or other improper operations, the system master can reset the TCA9548A by setting the RESET input low. Similarly, a power-on reset deselects all channels and initializes the I2C/SMBus state machine. Setting RESET to active can also achieve reset and initialization without powering off the component. This allows recovery when one of the downstream I2C buses is stuck low. The switches have conducting gates, so the VCC pin can be used to limit the maximum high voltage through the TCA9548A. After limiting the maximum high voltage, different bus voltages can be used on each pair, enabling 1.8V, 2.5V, or 3.3V components to communicate with 5V components without any additional protection. For each channel, an external pull-up resistor pulls the bus voltage to the desired voltage level. All I/O pins are 5V tolerant.

• 1-to-8 bidirectional translating switches, I²C bus and SMBus compatible
• Active-low reset input
• Three address pins supporting up to eight TCA9548A devices on the I²C bus
• Channel selection via I²C bus in any combination
• All switch channels deselected at power-up
• Low RON switches
• Voltage level translation between 1.8V, 2.5V, 3.3V, and 5V buses
• No glitch at power-up
• Hot-insertion capable
• Low standby current
• Operating supply voltage range: 1.65V to 5.5V
• 5V-tolerant inputs
• Clock frequency: 0 to 400kHz
• Latch-up performance exceeds 100mA per JESD 78 Class II
• ESD protection exceeds JESD 22 requirements
• ±2000V Human Body Model (A114-A)
• 200V Machine Model (A115-A)
• ±1000V Charged Device Model (C101)

• Servers
• Routers (telecom switching equipment)
• Factory automation
• Products with I2C slave address conflicts (e.g., multiple identical temperature sensors)