ADM232LJR-REEL

Overview

The ADM232LJR-REEL is a CMOS RS-232 transceiver from the ADM2xxL family, designed for EIA-232-E and V.28 interfaces using a single 5 V supply. It integrates two drivers and two receivers with internal charge pumps generating ±10 V levels. The device supports data rates up to 120 kbps and operates within a temperature range of -40°C to +85°C (Industrial grade). Key electrical parameters include a typical supply current of 6 mA, output voltage swing of ±9 V, and input protection up to ±30 V. It utilizes small 1 µF external capacitors and features Schmitt trigger inputs for noise immunity.

Feature Summary

• Integrates dual DC-to-DC converters to generate required RS-232 voltage levels from a single 5 V source
• Features Schmitt trigger receiver inputs with hysteresis to ensure error-free reception in noisy environments
• Includes internal pull-up and pull-down resistors on inputs to define logic states when unconnected
• Provides robust receiver input protection against overvoltage conditions

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific suffix 'J' indicates the Industrial temperature range (-40°C to +85°C) as per the datasheet selection guide. Confirm the '-REEL' designation corresponds to the tape and reel packaging format rather than tube packaging. Ensure the component matches the SOIC-16 package outline dimensions specified in the documentation before integration into the bill of materials.

Selection Notes

Select this part when a single 5 V supply is available but standard RS-232 voltage levels are required without external high-voltage supplies. It is suitable for applications needing full-duplex communication at speeds up to 120 kbps. Unlike the ADM232A, this L-series variant uses smaller 1 µF capacitors and offers lower power consumption. Verify that the lack of a shutdown pin meets the system's power management requirements.

Part Context

This component belongs to the ADM2xxL enhanced upgrade family, succeeding the AD2xx series. It shares the same functional architecture as the ADM232A but incorporates improvements such as reduced power dissipation, faster slew rates, and compatibility with smaller external capacitors. The L-series design specifically targets cost-sensitive and space-constrained embedded systems requiring reliable serial communication.

Replacement Considerations

ADM232AARNZ

FAQ

Does the ADM232LJR-REEL support low power shutdown mode?

No, the ADM232L does not feature a shutdown (SD) or enable (EN) pin. Only the ADM236L and ADM241L models in this family include these control functions.

What is the maximum input voltage the receivers can withstand?

The receiver inputs are protected against overvoltages up to ±30 V, ensuring safe operation even if signal lines exceed standard RS-232 levels.

Why are only 1 µF capacitors required for this device?

The ADM2xxL family utilizes an enhanced charge pump design that allows operation with smaller 1 µF ceramic capacitors, reducing board space and cost compared to older generations requiring larger values.