Overview
Features and Benefits
- Integrated Charge Pump Circuitry Simplifies Power Requirements
- Eliminates the Need for a ±12V 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 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 on-board 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. Please see order information table for package offerings.
Applications
- Battery-Powered Equipment
- Hand-Held Equipment
- Peripherals
- Portable Diagnostics Equipment
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Design Resources
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PCN-PDN Information
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