describe
The 1623 LTC® SMBus Switch Controller is a slave device which controls two high-side or N-channel MOSFETs on the SMBus or I2C bus. The LTC1623 operates on an input voltage from 2.7V to 5.5V with a low standby current of 14mA (at 3.3V). As specified in the SMBus specification, the LTC1623 maintains a VIH VIL of 0.6V and an input threshold of 1.4V over the entire supply voltage range. Using a 2-wire interface, clock and data, the LTC1623 monitors the bus for a start condition (data will go from high to low, CLK is high). Once the LTC1623 is detected, the address of the first (address) byte sent is on the slave master bus. If matched, the LTC1623 will execute the second (command) byte from the master to independently control the built-in charge pump driver two external switches. The LTC1623 has two tri-state programmable address pins, allowing eight different addresses and sixteen total available switches on the same bus. ...

Features
SMBus and I2C Compatible Built-in Charge Pump Driving N-Channel Switches
16 Switches available on the same bus are 0.6V for VIH VIL and 1.4V for data and clock in 8-pin MSOP and S0
Low Standby Current: Fourteen mA Eight addresses by two tri-state address pins Internal power-on reset timer Internal under-voltage lockout No external pull-up resistors required on outputs

ApplicationsComputer Peripheral ControlLaptop Power SupplyPlane SwitchingPortable DevicePower ControlIndustrial Control SystemsHandheld Devices