MAX3221EAE+

MAX3221EAE+ is a +3V to +5.5V RS-232 transceiver. It achieves 1µA supply current with the revolutionary AutoShutdown™ feature. When the MAX3223 does not sense a valid signal level on its 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. It requires 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 combines to deliver true RS-232 performance from a single +3.0V to +5.5V supply. Applications include battery-powered equipment, hand-held equipment, peripherals, portable diagnostics equipment.

• Integrated charge pump circuitry simplifies power requirements
• Eliminates the need for a ±12 supply
• 1µA supply current in shutdown mode saves power
• AutoShutdown feature is enabled after no activity on receiver inputs for 30µs
• Input leakage current is ±0.01µA at T-IN, EN, FORCEON, active-low FORCEOFF
• Output voltage swing is ±5.4V typ (all transmitter outputs loaded with 3kohm to ground)
• Output short-circuit current is ±35mA typical
• Maximum data rate is 235kbps typ at RL=3kohm, CL=1000pF, one transmitter switching
• 16 SSOP package
• Temperature range from -40°C to +85°C

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