The MAX3222 consists of two line drivers, two line receivers, and a dual charge-pump
circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). The
device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an
asynchronous communication controller and the serial-port connector. The charge pump and four small
external capacitors allow operation from a single 3-V to 5.5-V supply. The device operates at data
signaling rates up to 250 kbit/s and a maximum of 30-V/μs driver output slew rate.
The MAX3222 can be placed in the power-down mode by setting
PWRDOWN low, which draws only 1 μA from the power supply. When the device is
powered down, the receivers remain active while the drivers are placed in the high-impedance state.
Receiver outputs also can be placed in the high-impedance state by setting
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