ADM242AR-REEL

Overview

The ADM242ARZ-REEL is a high-speed RS-232 transceiver manufactured by Analog Devices Inc. It operates from a single 5 V power supply and supports transmission rates up to 200 kB/s. The device integrates two drivers and two receivers with on-board DC-DC converters that generate ±10 V using small 0.1 µF external capacitors. It features both shutdown (SHDN) and enable (EN) functions for power management and bus sharing. The component meets EIA-232-E and V.28 specifications, offers ±9 V output swing, and accepts ±30 V receiver input levels. It is housed in an 18-lead wide SOIC package.

Feature Summary

• Integrates dual RS-232 drivers and receivers with internal charge pump voltage conversion
• Includes active-low shutdown function to minimize power consumption while keeping receivers operational
• Features active-low enable control to disable receiver outputs for shared bus applications
• Provides TTL/CMOS compatible inputs with internal pull-up resistors and Schmitt trigger receivers

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific ordering suffix REEL against the manufacturer's current documentation to confirm packaging details. Ensure the component matches the required industrial temperature range of -40°C to +85°C. Confirm RoHS compliance status as indicated by the Z suffix in the base part number. Cross-reference pin configurations with existing designs to account for the 18-lead wide SOIC footprint.

Selection Notes

Select this component when a single 5 V supply operation is required alongside RS-232 interface capabilities. The integrated shutdown and enable pins make it suitable for systems requiring low standby power or multi-drop bus configurations. Verify that the 200 kB/s data rate meets system requirements. Ensure the design accommodates four 0.1 µF external capacitors for the internal charge pump circuitry.

Part Context

The ADM242ARZ-REEL belongs to the ADM222/ADM232A/ADM242 family of high-speed CMOS RS-232 drivers and receivers. This series utilizes BiCMOS technology to combine low power consumption with high-speed performance. The ADM242 variant specifically distinguishes itself by offering both shutdown and enable functionalities, providing greater control over power states and bus arbitration compared to its siblings.

Replacement Considerations

The ADM222 and ADM232A are pin-compatible alternatives within the same family. The ADM222 lacks the enable pin but includes shutdown functionality. The ADM232A does not include either shutdown or enable pins. Verify functional requirements before substituting, as the absence of control pins may impact power management or bus sharing capabilities.