The PCA9517D is a level-translating I2C Bus Repeater provides bidirectional voltage-level translation (up-translation/down-translation) between low voltages and higher voltages in mixed-mode applications. This device enables I2C and similar bus systems to be extended, without degradation of performance even during level shifting. The PCA9517 buffers both the serial data (SDA) and the serial clock (SCL) signals on the I2C bus, thus allowing two buses of 400pF bus capacitance to be connected in an I2C application. This device can also be used to isolate two halves of a bus for voltage and capacitance. The PCA9517 does not support clock stretching and arbitration across the repeater. The PCA9517 has an active-high enable (EN) input with an internal pull up to VCCB, which allows the user to select when the repeater is active. This can be used to isolate a badly behaved slave on power-up reset.
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