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    The AT3221E/AT3223E/AT3243E are 3V-powered EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wakeup features, high data- rate capabilities, and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air- Gap Discharge, to ±8kV using IEC 1000-4-2 Contact Discharge, and to ±15kV using the Human Body Model.

    The AT3221E/AT3223E/AT3243E achieve a 1µA supply current with Maxim’s revolutionary AutoShutdown™ feature. They save power without changes to the existing BIOS or operating system by enter- ing low-power shutdown mode when the RS-232 cable is disconnected, or when the transmitters of the connected peripherals are off.

    The transceivers have a proprietary low-dropout trans- mitter output stage, delivering true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1µF capaci- tors for operation from a +3.3V supply. Each device is guaranteed to run at data rates of 250kbps while main- taining RS-232 output levels.

    The AT3221E contains just one driver and one receiver, making it the smallest single-supply RS-232 transceiver. The AT3223E has two drivers and two receivers. The AT3243E is a complete 3-driver/5-receiver serial port ideal for notebook or subnotebook computers. It also includes two noninverting receiver outputs that are always active, allowing external devices to be monitored without forward biasing the protection diodes in circuitry that may be powered down.

    The AT3221E, AT3223E, and AT3243E are avail- able in space-saving TQFN, SSOP, and TSSOP pack- ages.


  • For Space-Constrained Applications:

  • AT3228E/AT3229E:±15kV ESD-Protected, +2.5V to +5.5V RS-232 Transceivers in UCSP™ 

  • AT3222E/AT3232E/AT3237E/AT3241E/ AT3246E: ±15kV ESD-Protected Down to 10nA,+3.0V to +5.5V, Up to 1Mbps, True RS-232 Transceivers (AT3246E Available in a UCSP Package)

  • For Data Cable Applications: AT3380E/AT3381E: 

  • +2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD- Protected I/O and Logic Pins


  • Notebook, Subnotebook, and Palmtop Computers 

  • Cellular Phones

  • Battery-Powered Equipment 

  • Handheld Equipment 

  • Peripherals

  • Printers