General Description
The MAX3221/MAX3223/MAX3243 achieve 1µA supply current with Maxim’s revolutionary AutoShutdown™ feature. When the MAX3221/MAX3223/MAX3243 do not sense a valid signal level on their receiver inputs, the on-board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are turned off. The system turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing BIOS or operating system.

FEATUREs
♦ For Space-Constrained Applications: MAX3228/MAX3229: +2.5V to +5.5V RS-232
   Transceivers in UCSP™
♦ For Integrated ESD Protection: MAX3222E/MAX3232E/MAX3237E/MAX3241E*/ MAX3246E:
   ±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
   (MAX3246E Available in UCSP Package)
♦ For Low-Voltage or Data Cable Applications: MAX3380E/MAX3381E:
   +2.5V to +5.5V, 1µA, 2 Tx/2 Rx RS-232 Transceivers with ±15kV
   ESD Protected I/O and Logic Pins

APPLICATIONs
   Notebook, Subnotebook, and Palmtop Computers
   Battery-Powered Equipment
   Hand-Held Equipment
   Peripherals
   Printers