ADM241LARS

Overview

The ADM241L is a 5 V-powered CMOS RS-232 transceiver featuring four drivers and five receivers. It operates from a single 5 V supply using internal charge pumps to generate ±10 V levels, meeting EIA-232-E specifications with ±9 V output swing. The device supports data rates up to 120 kbps and includes low power shutdown (≤1 µA) and enable functions for microprocessor interfacing. It accepts ±30 V receiver inputs and utilizes small 1 µF external capacitors. Available in 28-pin SOIC and SSOP packages, it offers latch-up protection and Schmitt trigger inputs for noise immunity.

Feature Summary

• Integrates dual charge pump converters to generate required RS-232 voltage levels from a single 5 V digital supply
• Includes dedicated shutdown and enable control pins for power management and bus sharing compatibility
• Features Schmitt trigger receivers with hysteresis to ensure reliable signal reception in noisy environments
• Provides robust input protection against high voltage transients on the serial communication lines

Applications

• Battery-powered portable computing equipment requiring low standby current
• Microprocessor-based systems needing shared bus line connectivity via enable controls
• Industrial instruments operating in electrically noisy environments
• Peripherals and modems requiring compliance with EIA-232-E standards

Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature range. Ensure the selected variant matches the required industrial or commercial operating conditions. Confirm pinout compatibility with existing PCB layouts before integration. Cross-reference the datasheet revision to validate all electrical parameters against the manufacturing batch.

Selection Notes

Select the ADM241L when four transmit and five receive channels are required within a single package. Choose this component over the ADM236L if additional receiver inputs are necessary for complex peripheral interfaces. Consider the integrated shutdown feature for applications prioritizing energy efficiency in battery-operated devices. Verify that the 28-pin footprint aligns with the target enclosure constraints.

Part Context

The ADM241L belongs to the ADM2xxL family of enhanced CMOS RS-232 transceivers. This series improves upon the legacy AD2xx family by offering lower power consumption, faster slew rates, and compatibility with smaller 1 µF capacitors. It serves as a direct upgrade for designs previously utilizing older generation RS-232 components, providing improved performance metrics while maintaining standard interface compatibility.

Replacement Considerations

The ADM236L is a verified substitute part number offering similar functionality but with three receivers instead of five. Designers must verify pinout compatibility and ensure the reduced receiver count meets system requirements. No other direct substitutes are documented in the official selection table.