PCA9509DP

电平转换I2C总线/ SMBus的中继 Level translating I2C-bus/SMBus repeater

The is a level translating I²C-bus/SMBus Repeater enables processor low voltage 2-wire serial bus to interface with standard I²C-bus or SMBus I/O. While retaining all the operating modes and features of the I²C-bus system during the level shifts, it also permits extension of the I²C-bus by providing bi-directional buffering for both the data SDA and the clock SCL lines, thus enabling the I²C-bus or SMBus maximum capacitance of 400pF on the higher voltage side. Port-A allows a voltage range from 1.35V to VCCB 1V and requires no external pull-up resistors due to the internal current source. Port-B allows a voltage range from 3 to 5.5V and is overvoltage tolerant. Both port-A and port-B SDA and SCL pins are high-impedance when the repeater is unpowered.

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Active high repeater enable input

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Open-drain inputs/outputs

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Lock-up free operation

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Supports arbitration and clock stretching across the repeater

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Powered-off high-impedance I²C pins