XRA12xx 8-Bit I2C/SMBus GPIO Expanders MaxLinear XRA12xx 8-Bit I2C/SMBus General Purpose I/O Expanders feature an I2C/SMBus interface. After power-up, the XRA12xx 8-Bit General Purpose I/O Expanders includes an internal 100K ohm pull-up resistors on each I/O pin that can be individually enabled. In addition, the GPIOs on these MaxLinear XRA12xx 8-Bit General Purpose I/O Expanders can individually be controlled and configured. Applications for these devices include PDAs, cell phones, data, battery-operated, GPS, and BLUETOOTH devices.