The PCA9511 is a are hot swappable I2C-bus and SMBus bufferthat allows I/O card insertion into a live backplane without corruptingthe data and clock buses. Control circuitry prevents the backplanefrom being connected to the card until a STOP command or bus idleoccurs on the backplane without bus contention on the card. Whenthe connection is made, the PCA9511 provides bidirectionalbuffering, keeping the backplane and card capacitances isolated.
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