The ADM101E is a single channel RS-232 driver and receiver in the Analog Devices Craft Port series, designed to operate from a single, +5 V supply. A highly efficient charge-pump voltage inverter generates an on-chip 5 V supply, which eliminates the need for a negative power supply for the driver and permits RS-232 compatible output levels to be developed using charge pump capacitors as small as 0.1 F. A shutdown input disables the charge pump and puts the device into a low power shutdown mode, in which the current consumption is typically less than 1 A. The transmitter is disabled during shutdown but the receiver remains functional.