Product Details

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.

Product Features

● Integrated Charge Pump Circuitry Simplifies Power Requirements 

• Eliminates the Need for a ±12 Supply 

• Operation From a Single +3.3V or +5V Supply 

● 1µA Supply Current in Shutdown Mode Saves Power 

• AutoShutdown Feature is Enabled After No Activity on Receiver Inputs for 30µs 

• Software Control Option for Shutdown

Product Applications

​● Battery-Powered Equipment 

● Hand-Held Equipment 

● Peripherals 

● Portable Diagnostics Equipment

Specifications

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