TCA9546A Series
4-channel 1.65- to 5.5-V I2C/SMBus switch with reset & voltage translation
Manufacturer: Texas Instruments
Catalog
4-channel 1.65- to 5.5-V I2C/SMBus switch with reset & voltage translation
Key Features
• 1-of-4 Bidirectional translating switchesI2C Bus and SMBus compatibleActive-low reset inputThree address pins, allowing up to eight TCA9546A devices on the I2C busChannel selection via I2C Bus, in any combinationPower-up with all switch channels deselectedLow RONswitchesAllows voltage-level translation between1.8-V, 2.5-V, 3.3-V, and 5-V busesNo glitch on power-upSupports hot insertionLow standby currentOperating power-supply voltage range of 1.65 V to 5.5 V5.5 V Tolerant inputs0 to 400-kHz Clock frequencyLatch-up performance exceeds 100 mA Per JESD 78ESD Protection exceeds JESD 224000-V Human-body model (A114-A)1500-V Charged-device model (C101)1-of-4 Bidirectional translating switchesI2C Bus and SMBus compatibleActive-low reset inputThree address pins, allowing up to eight TCA9546A devices on the I2C busChannel selection via I2C Bus, in any combinationPower-up with all switch channels deselectedLow RONswitchesAllows voltage-level translation between1.8-V, 2.5-V, 3.3-V, and 5-V busesNo glitch on power-upSupports hot insertionLow standby currentOperating power-supply voltage range of 1.65 V to 5.5 V5.5 V Tolerant inputs0 to 400-kHz Clock frequencyLatch-up performance exceeds 100 mA Per JESD 78ESD Protection exceeds JESD 224000-V Human-body model (A114-A)1500-V Charged-device model (C101)
Description
AI
The TCA9546A is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register.
An active-low reset (RESET) input allows the TCA9546A to recover from a situation in which one of the downstream I2C buses is stuck in a low state. PullingRESETlow resets the I2C state machine and causes all the channels to be deselected, as does the internal power-on reset function.
The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage, which will be passed by the TCA9546A. This allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5.5-V tolerant.
The TCA9546A is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register.
An active-low reset (RESET) input allows the TCA9546A to recover from a situation in which one of the downstream I2C buses is stuck in a low state. PullingRESETlow resets the I2C state machine and causes all the channels to be deselected, as does the internal power-on reset function.
The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage, which will be passed by the TCA9546A. This allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5.5-V tolerant.
