ADM241LARZ

Overview

The ADM241LARZ is a CMOS RS-232 transceiver from the ADM2xxL family, designed for EIA-232-E and V.28 communications interfaces using a single 5 V power supply. It integrates four drivers and five receivers within a 28-pin SOIC package. The device features on-board dc-to-dc converters that generate ±10 V levels from the 5 V input, utilizing small 1 µF external capacitors. It supports data rates up to 120 kbps with an output swing of ±9 V. Key control inputs include Shutdown (SD) and Enable (EN), allowing for low power consumption of less than 5 µW in shutdown mode.

Feature Summary

• Integrates internal charge pump voltage converters to operate from a single 5 V supply without requiring external ±12 V sources.
• Features a low power shutdown mode that disables the charge pump and outputs, reducing power dissipation to under 5 µW.
• Includes receiver enable functionality to place outputs in a high impedance state for bus sharing or microprocessor interfacing.
• Provides Schmitt trigger inputs with hysteresis to ensure error-free reception in noisy environments.

Applications

• Battery-powered equipment requiring minimal power consumption
• Computers and peripheral devices
• Modems and printers
• Instruments

Procurement Notes

Verify the specific suffix 'ARZ' corresponds to the industrial temperature range (-40°C to +85°C) and RoHS compliance as defined by Analog Devices. Confirm the package type matches the required PCB footprint, typically SOIC-Wide for this part number. Ensure the design accounts for the necessary 1 µF ceramic capacitors for the charge pump circuitry.

Selection Notes

Select the ADM241LARZ when a single 5 V supply is available but RS-232 signal levels are required. This part is suitable for applications needing four transmit channels and five receive channels. Consider the Shutdown and Enable pins if power management or bus tri-stating is necessary. Verify that the load capacitance does not exceed 2500 pF for optimal slew rate performance at 120 kbps.

Part Context

The ADM241L is part of the ADM2xxL enhanced upgrade series, succeeding the AD2xx family. It offers lower power consumption, faster slew rates, and compatibility with smaller 1 µF capacitors compared to previous generations. The L-series designation indicates optimization for single 5 V operation with integrated charge pumps.

Replacement Considerations

The MAX241CWI+T is a functional equivalent offering similar 5 V operation, 4 drivers, and 5 receivers. Note that the MAX241 may have different pinout configurations or capacitor requirements; verify datasheet compatibility before substitution.