MAX3245ECWI

Overview

The MAX3245ECWI+T is a true RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 28-pin Wide SO package. It features three drivers and five receivers with a guaranteed data rate of 1Mbps. The device operates on a single +3.0V to +5.5V supply and achieves a typical supply current of 1μA through AutoShutdown Plus technology. It includes dual charge pumps requiring four small capacitors for operation. ESD protection is rated at ±15kV (Air-Gap), ±8kV (Contact), and ±15kV (Human Body Model). The operating temperature range is 0°C to +70°C.

Feature Summary

• AutoShutdown Plus feature automatically reduces supply current to 1μA when the interface is idle or disconnected, waking up upon valid signal transitions without BIOS changes.
• MegaBaud operation guarantees 1Mbps data rates for high-speed applications such as ISDN modem communication.
• Proprietary low-dropout transmitter output stage enables true RS-232 performance from a +3.0V to +5.5V supply using a dual charge pump.
• Enhanced electrostatic discharge protection on all transmitter outputs and receiver inputs ensures robustness against environmental interference.

Applications

• Notebook, Subnotebook, and Palmtop Computers
• Cellular Phones
• Battery-Powered Equipment
• Hand-Held Equipment
• Peripherals

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature rating. Confirm RoHS compliance status directly from the manufacturer's datasheet or component markings. Ensure the supplier provides traceability documents matching the exact part number. Cross-reference pin configurations with the official pin description table before integration.

Selection Notes

Select this component for designs requiring high-speed 1Mbps RS-232 communication within space-constrained environments. The wide SO package offers a balance between thermal dissipation and board area efficiency compared to smaller packages. Consider the AutoShutdown Plus functionality for battery-operated systems to minimize standby power consumption significantly.

Part Context

This device belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E family of 3V-powered RS-232 interfaces. It shares core technologies like AutoShutdown Plus and MegaBaud operation with siblings such as the MAX3244E, differing primarily in driver/receiver counts and maximum data rates.

Replacement Considerations

MAX3245ECAI+T: Identical electrical specifications and functionality, but utilizes a 28-pin SSOP package instead of the Wide SO format.

FAQ

How does the INVALID output function?

The INVALID output goes low when no valid RS-232 voltage levels are detected on any receiver input. It indicates the physical state of the receiver inputs and remains independent of the FORCEON and FORCEOFF control states.

What triggers the AutoShutdown Plus mode?

The device enters AutoShutdown Plus mode when it senses that all receiver and transmitter inputs have been inactive for more than 30 seconds, causing the internal charge pumps to shut down and reducing supply current to 1μA.

Can unused transmitter inputs be left floating?

No, unused transmitter inputs should not be left floating. They must be connected to either GND or VCC to ensure stable operation and prevent unintended triggering of the shutdown circuitry.