The MAX3221E is a single driver, single receiver RS-232 solution operating from a single
VCC supply. The RS-232 pins provide IEC 61000-4-2 ESD protection. 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. These devices operate at
data signaling rates up to 250 kbit/s and a maximum of 30-V/µs driver output slew rate.
Flexible control options for power management are available. Auto-power down disables
driver and charge pump when the receiver is disconnected or the remote driver is power down. The
drivers can be manually enabled or disabled. INVALID output goes low when
receiver input is unconnected or power off.
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