PCA9545A/PCA9545B/PCA9545C 4-channel I2C-bus Switch With Interrupt Logic And Reset

The PCA9545A PCA9545B/PCA9545C 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 SCx/SDx channel or combination of channels CAN be selected, determined by the contents of the programmable control Register Four interrupt inputs, INT0 to INT3, one for each of the downstream pairs, are provided. One interrupt output, INT, acts as an AND of the four interrupt inputs. An active LOW reset input allows the PCA9545A PCA9545B/PCA9545C to recover from a situation where one of the downstream I2C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I2C-bus 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 VDD pin CAN be used to limit the maximum high voltage which will be passed by the PCA9545A PCA9545B/PCA9545C . This allows the use of different bus voltages on each pair, so that 1.8 V or 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 V tolerant. The PCA9545A PCA9545B and PCA9545C are identical except for the fixed portion of the slave address.
By NXP Semiconductors
Part Manufacturer Description Datasheet Samples
PCA9545AGQNR Texas Instruments 9545 SERIES, 4 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PBGA20, PLASTIC, VFBGA-20
PCA9545ADGVRG4 Texas Instruments 4-Channel I2C And SMBus Multiplexer With Interrupt Logic And Reset Functions 20-TVSOP -40 to 85
PCA9545AZQNR Texas Instruments 4-Channel I2C And SMBus Multiplexer With Interrupt Logic And Reset Functions 20-BGA MICROSTAR JUNIOR -40 to 85
PCA9545ADW Texas Instruments 4-Channel I2C And SMBus Multiplexer With Interrupt Logic And Reset Functions 20-SOIC -40 to 85
PCA9545APWR Texas Instruments 4-Channel I2C And SMBus Multiplexer With Interrupt Logic And Reset Functions 20-TSSOP -40 to 85
PCA9545APWE4 Texas Instruments 4-Channel I2C And SMBus Multiplexer With Interrupt Logic And Reset Functions 20-TSSOP -40 to 85
PCA9545ARGYRG4 Texas Instruments 4-Channel I2C And SMBus Multiplexer With Interrupt Logic And Reset Functions 20-VQFN -40 to 85
PCA9545APW Texas Instruments 4-Channel I2C And SMBus Multiplexer With Interrupt Logic And Reset Functions 20-TSSOP -40 to 85
PCA9545ARGYR Texas Instruments 4-Channel I2C And SMBus Multiplexer With Interrupt Logic And Reset Functions 20-VQFN -40 to 85
PCA9545ADWR Texas Instruments 4-Channel I2C And SMBus Multiplexer With Interrupt Logic And Reset Functions 20-SOIC -40 to 85
PCA9545A 's PackagesPCA9545A 's pdf datasheet
PCA9545ABS HVQFN
PCA9545AD SO
PCA9545APW TSSOP
PCA9545BPW TSSOP
PCA9545CPW TSSOP




PCA9545A Pinout, Pinouts
PCA9545A pinout,Pin out
This is one package pinout of PCA9545A,If you need more pinouts please download PCA9545A's pdf datasheet.

PCA9545A Application circuits
PCA9545A circuits
This is one application circuit of PCA9545A,If you need more circuits,please download PCA9545A's pdf datasheet.


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