The MAX3221E/MAX3223E/MAX3243E are 3V-powered EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wakeup features, high datarate capabilities, and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to 15kV using IEC 1000-4-2 AirGap Discharge, to 8kV using IEC 1000-4-2 Contact Discharge, and to 15kV using the Human Body Model. The MAX3221E/MAX3223E/MAX3243E achieve a 1A supply current with Maxim's revolutionary AutoShutdownTM feature. They save power without changes to the existing BIOS or operating system by entering low-power shutdown mode when the RS-232 cable is disconnected, or when the transmitters of the connected peripherals are off.