ADM242AN

Overview

The ADM242AN is an 18-lead plastic dual in-line package (N-18) RS-232 line driver and receiver manufactured by Analog Devices Inc. Operating from a single 5 V power supply, it integrates on-board DC-DC converters to generate the required bipolar voltage levels. The device supports transmission rates up to 200 kB/s and meets EIA-232-E and V.28 specifications. It features two drivers and two receivers with ±9 V output swing and ±30 V receiver input levels. The component includes both shutdown (SHDN) and enable (EN) functions for power management and bus sharing.

Feature Summary

• Integrates on-board charge pump DC-DC converters requiring only small external capacitors
• Includes active low shutdown function to minimize power consumption while keeping receivers operational
• Features active low enable function to disable receiver outputs for common bus sharing
• Pin compatible with MAX222, MAX232A, and MAX242 devices

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific ordering suffix 'AN' against the manufacturer's official ordering guide to confirm the package type and temperature range. Ensure compatibility with existing PCB footprints designed for 18-lead DIP packages. Confirm that the selected variant meets all necessary regulatory compliance requirements for the intended deployment environment.

Selection Notes

Select this component when a single 5 V supply operation is required alongside integrated voltage generation capabilities. The inclusion of both enable and shutdown pins distinguishes it from similar family members like the ADM232A. Verify that the 200 kB/s data rate aligns with system timing requirements and that the 18-lead DIP package fits the mechanical constraints of the design.

Part Context

The ADM242AN belongs to the ADM222/ADM232A/ADM242 family of high-speed CMOS RS-232 drivers and receivers. This series represents an enhancement over the earlier AD230-AD241 family, offering improved performance while maintaining pin compatibility with industry-standard alternatives. The ADM242 specifically adds control features not present in the base ADM232A model.

Replacement Considerations

The datasheet confirms pin compatibility with the MAX222, MAX232A, and MAX242. Designers should verify electrical parameter overlaps before substituting these Maxim Integrated parts.