ADM236LJR-REEL

Overview

The ADM236LJR-REEL is a CMOS RS-232 transceiver from Analog Devices, designed for single 5 V power supply operation. It integrates four drivers and three receivers within a 24-pin SOIC package. The device supports data rates up to 120 kbps and features on-board DC-to-DC converters that generate ±10 V supplies using small 1 µF capacitors. It includes low power shutdown and enable functions, with an active-high SD pin reducing current to less than 1 µA. The component meets EIA-232-E specifications and operates across the industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates internal charge pump voltage converters to operate from a single 5 V supply without external high-voltage sources.
• Features a low power shutdown mode controlled by an active-high input to minimize energy consumption in battery-powered systems.
• Includes an active-low enable input to place receiver outputs in a high impedance state for bus sharing or microprocessor interfacing.
• Provides Schmitt trigger inputs on receivers to ensure noise immunity and error-free reception with slow signal transitions.

Applications

• Battery-powered computers and portable instruments
• Peripherals requiring RS-232 communication interfaces
• Modems and printers operating on single 5 V logic levels

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the reel packaging format. Ensure the component version matches the required industrial temperature rating and package type for your design. Cross-reference the datasheet revision to confirm all electrical parameters align with your system requirements before finalizing procurement.

Selection Notes

Select this component when a single 5 V supply is available but RS-232 voltage levels are required. It is suitable for designs needing multiple transmit channels alongside receive lines. Consider the integrated shutdown feature if power management is critical. Verify that the 120 kbps data rate meets the application speed requirements and that the 24-pin footprint fits the PCB layout constraints.

Part Context

This part belongs to the ADM2xxL family of enhanced RS-232 line drivers and receivers. It serves as an upgrade to the older AD2xx series, offering lower power consumption and faster slew rates. The ADM236L specifically provides a balanced configuration of four drivers and three receivers, distinguishing it from other family members like the ADM237L or ADM238L which offer different driver/receiver counts.

Replacement Considerations

The ADM236L is a direct plug-in upgrade for the AD236. Designers replacing legacy AD236 components should verify that the improved slew rate and lower capacitor requirements do not necessitate PCB layout changes. Ensure that the replacement part maintains compatibility with the existing control logic for the shutdown and enable pins.