PCA9548APW,118

PCA9548APW,118 is an octal bidirectional translating switch controlled via the I²C-bus. The SCL/SDA upstream pair fans out to eight 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. An active LOW reset input allows the PCA9548A 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 PCA9548A. This allows the use of different bus voltages on each pair, so that 1.8V or 2.5V or 3.3V parts can communicate with 5V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel.

• 1-of-8 bidirectional translating switches, active LOW reset input
• Three address pins allowing up to eight devices on the I²C-bus
• Power-up with all switch channels deselected, low Ron switches
• No glitch on power-up, supports hot insertion, low standby current
• Operating power supply voltage range of 2.3V to 5.5V, 6V tolerant inputs
• Latch-up testing is done to JEDEC standard JESD78 which exceeds 100mA
• ESD protection exceeds 2000V HBM per JESD22-A114 and 1000V CDM per JESD22-C101
• Standby current is 1µA maximum at (-40°C to +85°C)
• Power-on reset voltage is 1.6V typical at (no load; VI = VDD or VSS)
• Operating temperature range from -40°C to +85°C, TSSOP24 package