The TCA9546APWR is a quad bidirectional translating switch controlled via theI2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, orchannels. Any individual SCn/SDn channel or combination of channels can be selected, determined bythe contents of the programmable control register.
An active-low reset (RESET low resets the I2C statemachine and causes all the channels to be deselected, as does the internal power-on resetfunction.
The pass gates of the switches are constructed such that the VCC pin can be used to limitthe maximum high voltage, which will be passed by the TCA9546A. This allows the use of differentbus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V partswithout any additional protection. External pull-up resistors pull the bus up to the desiredvoltage level for each channel. All I/O pins are 5.5-V tolerant.
Feature
- 1-of-4 Bidirectional translating switches
- I2C Bus and SMBus compatible
- Active-low reset input
- Three address pins, allowing up to eight TCA9546A devices on theI2C bus
- Channel selection via I2C Bus, in anycombination
- Power-up with all switch channels deselected
- Low RON switches
- Allows voltage-level translation between1.8-V, 2.5-V, 3.3-V, and 5-V buses
- No glitch on power-up
- Supports hot insertion
- Low standby current
- Operating power-supply voltage range of 1.65 V to 5.5 V
- 5.5 V Tolerant inputs
- 0 to 400-kHz Clock frequency
- Latch-up performance exceeds 100 mA Per JESD 78
- ESD Protection exceeds JESD 22
- 4000-V Human-body model (A114-A)
- 1500-V Charged-device model (C101)
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