ADM242ARZ-REEL

Overview

The ADM242ARZ-REEL is a high-speed RS-232 line driver and receiver manufactured by Analog Devices Inc. It operates from a single 5 V power supply and integrates on-board DC-DC converters to generate the required bipolar voltage levels. The device features two drivers and two receivers with a maximum transmission rate of 200 kB/s. It includes both shutdown (SHDN) and enable (EN) functions for power management and bus sharing. The component meets EIA-232-E and V.28 specifications, offering ±9 V output swing and ±30 V receiver input protection. It is housed in an 18-lead Standard Small Outline Package (RW-18) and supports an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates charge pump voltage converter requiring only four 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
• Provides internal pull-up resistors on TTL/CMOS inputs and pull-down resistors on RS-232 inputs

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify that the ordering suffix matches the specific package variant required for the design. Confirm RoHS compliance status if environmental regulations apply to the target market. Ensure the supplier provides documentation confirming the component originates from authorized manufacturing channels to guarantee reliability and authenticity.

Selection Notes

Select this model when a single 5 V supply is available and RS-232 communication is required. The integrated shutdown and enable pins make it suitable for applications needing low standby current or multi-drop bus configurations. Verify that the 200 kB/s data rate aligns with system timing requirements and that the 18-lead package fits the PCB layout constraints.

Part Context

This component belongs to the ADM222/ADM232A/ADM242 family of high-speed CMOS RS-232 drivers and receivers. The ADM242 variant specifically adds enable functionality compared to the ADM222, which lacks the EN pin but shares similar shutdown capabilities. All members of this family utilize BiCMOS technology to achieve low power dissipation while maintaining high-speed performance.

Replacement Considerations

The ADM232A is pin-compatible but lacks the shutdown and enable functions found in the ADM242. The ADM222 offers shutdown capability but does not include the separate enable control for the receivers. Designers must verify functional equivalence regarding control logic before substituting these parts.