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Part Number Description Tx Cross Reference Vsupply (V) Rx Data Rate (min) (kbps) Icc (typ) (mA) Internal Charge Pump Ext. Caps Cap. Value (nom) (µF) ESD Protect. (±kV) Rx Active in Shutdn RoHS Available Pin/Package
AT3222E ±15kV, ESD-Protected, 3.0V to 5.5V, Low-Power, 250kbps, True RS-232 Transceiver with Shutdown 2 MAX3222E 3.3 ,5 2 250 0.3 Yes 4 0.1 15 1 Yes TSSOP20 SSOP20 SOP18


      The AT3222E series has a high-efficiency, charge-pump power supply that requires only 0.1mF capacitors in 3.3V operation. This charge pump allows the AT3222E/3232E series to deliver true RS-232 performance from a single power supply ranging from +3.3V to +5.0V.The AT3222E/3232E are 2-driver/2-receiver devices. The ESD tolerance of the AT3222E devices are over ±15kV for both Human Body Model and IEC1000-4-2 Air discharge test methods. The AT3222E device has a low-power shutdown mode where the devices' driver outputs and charge pumps are disabled. During shutdown, the supply current falls to less than 1mA.


Meets true RS232 Standards from a +3.0V to +5.5V power supply Minimum 120Kbps Data Rate Under Full Load

1mA Low-Power Shutdown with Receivers Active (AT3222E)

Interoperable with RS-232 down to +2.7V power source

Enhanced ESD Specifications:

±15kV Human Body Model

±15kV IEC1000-4-2 Air Discharge

±8kV IEC1000-4-2 Contact Discharge


portable or hand- held applications 

battery-pow- ered



Typical Operating Circuit


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