MAX3221EAE+T

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 onboard 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.
The MAX3221/MAX3223/MAX3243 require only 0.1µF
capacitors in 3.3V operation, and can operate from input
voltages ranging from +3.0V to +5.5V.
A proprietary, high-efficiency, dual charge-pump power
supply and a low-dropout transmitter combine to deliver
true RS-232 performance from a single +3.0V to +5.5V
supply.
The MAX3221 is a 1-driver/1-receiver 16-pin SSOP
version of the 20-pin 2-driver/2-receiver MAX3223.
The MAX3243 is a 3-driver/5-receiver with a complementary
always-active receiver for external monitoring in a variety
of 28 pin packages. See Order Information table for
package offerings.