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 μF. 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 μA. The transmitter is disabled during shutdown but the receiver remains functional. An epitaxial BiCMOS construction minimizes power consumption to 3 mW and also guards against latch-up. Overvoltage protection is provided allowing the receiver inputs to withstand continuous voltages in excess of ±30 V. In addition， all I-O pins have ESD protection to levels greater than 15 kV. The ADM101E is available in a 10-lead MSOP package， which makes it ideal for serial communications in small， portable applications such as palmtop computers and mobile telephones， where a full， RS-232 serial interface is not required， but compact size and low power drain are paramount.