MAX242CPN

Overview

The MAX242CPN+ is a +5V-powered, multichannel RS-232 driver and receiver manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 4.5V to 5.5V with a typical operating current of 10mA. The device supports data rates up to 200kbps and features two drivers and two receivers. It includes an integrated shutdown mode that reduces power consumption significantly. The component is housed in an 18-pin PDIP package and functions across a commercial temperature range from 0°C to +70°C.

Feature Summary

• Integrated charge pump circuitry eliminates the need for external bipolar ±12V supplies, enabling single +5V operation.
• Shutdown mode provides low-power standby capability to reduce overall system energy requirements.
• Provides EIA/TIA-232E and V.28/V.24 interface compatibility for standard serial communications.

Applications

• Interface translation between TTL/CMOS logic levels and RS-232 standards
• Multidrop RS-232 network connections
• Portable diagnostics equipment requiring low power consumption

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type and temperature grade. Confirm RoHS compliance status as indicated in the datasheet. Ensure the component source matches the authorized manufacturer or distributor list to avoid counterfeit parts.

Selection Notes

Select this component when designing systems limited to a single +5V power rail without access to negative voltages. Consider the 18-pin DIP package constraints for through-hole assembly. Evaluate the 200kbps data rate limit against application speed requirements before finalizing the design.

Part Context

This part belongs to the MAX220–MAX249 family of line drivers and receivers designed for EIA/TIA-232E applications. The family offers various channel configurations and packages to address different board space and performance needs while maintaining compatibility with standard serial communication protocols.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout and electrical specifications carefully if considering alternative RS-232 transceivers from other manufacturers.

FAQ

Does the MAX242CPN+ require external capacitors for the charge pump?

Yes, the MAX242 requires external capacitors (C1–C4) to support the internal dual charge-pump DC-DC voltage converters that generate the necessary ±10V signals from the +5V supply.

What is the input voltage tolerance for the receiver inputs?

The RS-232 receiver inputs can withstand voltages up to ±30V, providing protection against potential damage during connection errors or high-voltage transients.

How does the shutdown feature affect the output states?

When the shutdown pin is activated, the transmitter outputs enter a high-impedance state, and the receivers switch to a low-power receive mode, significantly reducing the supply current.