MAX241CAI+

Overview

The MAX241CAI+ is a +5V-powered, multichannel RS-232 driver and receiver integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It operates within a commercial temperature range of 0°C to +70°C and utilizes a 28-pin Wide SOIC package. The device provides four drivers and five receivers for full-duplex communication with a maximum data rate of 120 kbps. It features an internal charge pump that generates the required ±10V supply rails from a single +5V input, eliminating the need for external bipolar power sources.

Feature Summary

• Integrated charge pump circuitry eliminates the requirement for external bipolar ±12V power supplies.
• Enables single-supply operation using only a +5V source.
• Includes shutdown mode functionality to significantly reduce power consumption.

Applications

• Interface translation between TTL/CMOS logic and RS-232 standards
• Multidrop RS-232 network connections
• Portable diagnostics equipment

Procurement Notes

Verify the specific suffix 'CAI+' against official documentation to confirm the 0°C to +70°C operating temperature range and the 28-pin Wide SOIC package configuration. Ensure compatibility with the required voltage levels and interface protocols before procurement.

Selection Notes

Select this component when designing systems requiring multiple RS-232 channels powered exclusively by a +5V rail. Consider the 120 kbps data rate limit and the absence of ESD protection on the inputs when evaluating system requirements.

Part Context

This part belongs to the MAX220–MAX249 family of line drivers/receivers designed for EIA/TIA-232E and V.28/V.24 communications interfaces. The family offers various channel configurations and packages to accommodate different board space and performance needs.

Replacement Considerations

The MAX241EWI+ serves as a direct replacement offering identical electrical specifications but extended to an industrial temperature range of -40°C to +85°C in the same package.

FAQ

Does the MAX241CAI+ require external capacitors for its charge pump?

Yes, the datasheet specifies the use of external capacitors (typically C1 through C4) to support the internal dual charge-pump DC-DC voltage converters.

What is the input voltage operating range for the receivers?

The receivers feature an RS-232 input voltage operating range of ±30V.

How does the shutdown feature affect the internal power rails?

When the shutdown pin is activated, the internal charge pumps cease operation, causing the V- output to fall to 0V and the V+ output to fall to +5V.