MAX241ECWI

Overview

The MAX241ECWI+ is a single-supply RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a +5V supply and includes an integrated charge pump to generate the required ±10V levels, eliminating the need for external bipolar supplies. The device features four drivers and five receivers, supporting full-duplex communication at data rates up to 120kbps. It provides high electrostatic discharge protection of ±15kV via the Human Body Model. The component is housed in a 28-pin SOIC package and functions within an operating temperature range of 0°C to +70°C.

Feature Summary

• Integrated charge pump circuitry enables operation from a single +5V power supply without requiring external dual-voltage sources.
• High robustness against electrostatic discharge with ±15kV Human Body Model protection on all RS-232 inputs and outputs.
• Includes low-power shutdown mode that reduces supply current to typically 1μA while disabling driver outputs.

Applications

• Battery-powered equipment
• Hand-held equipment
• Portable diagnostics equipment

Procurement Notes

Verify the specific suffix 'C' indicates the commercial temperature range (0°C to +70°C) and 'W' denotes the SOIC package format. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations prior to integration into production designs.

Selection Notes

Select this component when designing systems requiring multiple transmit and receive channels on a single chip. The integrated ESD protection makes it suitable for environments where frequent cable connection occurs. Ensure the application supports the 120kbps maximum data rate and utilizes the 28-pin footprint constraints.

Part Context

This part belongs to the MAX202E–MAX213E family of RS-232 transceivers. It shares architectural similarities with the MAX232E but offers increased channel density with four drivers and five receivers. The 'E' designation signifies enhanced ESD protection capabilities compared to standard non-E versions.

Replacement Considerations

The MAX241EWI+ serves as a direct replacement offering an extended industrial temperature range (-40°C to +85°C). Verify pin compatibility and thermal requirements before substituting the commercial grade unit with the industrial grade variant.

FAQ

What capacitor values are required for the charge pump?

The MAX241E requires four 1μF capacitors connected to the C1+, C1-, C2+, and C2- terminals to support the internal voltage conversion.

How does the shutdown control function operate?

The SHDN pin is active-high; driving it high disables the charge pumps and transmitter outputs, reducing supply current to approximately 1μA.

Is hysteresis present on the receiver inputs?

Yes, the receivers feature approximately 0.5V of input hysteresis to ensure clean output transitions despite slow rise/fall times or noise.