ADM239LAN

Overview

The Analog Devices ADM239LAN is a CMOS RS-232 transceiver designed for EIA-232-E and V.28 communication interfaces. It integrates three drivers and five receivers, requiring only a single 5 V supply alongside an external 7.5 V to 13.2 V positive supply. The device includes an internal charge pump that generates a negative voltage from the 5 V input. Key electrical parameters include a data rate of 120 kbps, ±9 V output swing, and low power shutdown current of ≤1 µA. It features Schmitt trigger inputs with 0.65 V hysteresis and operates within commercial (0°C to 70°C) or industrial (-40°C to +85°C) temperature ranges.

Feature Summary

• Integrates three TTL/CMOS-to-RS-232 drivers and five RS-232-to-TTL/CMOS receivers on a single chip
• Includes an active-low enable input to place receiver outputs in a high impedance state
• Features internal pull-up resistors on driver inputs and pull-down resistors on receiver inputs
• Provides ±30 V protection on receiver inputs against overvoltage conditions

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific suffix 'LAN' against official documentation to confirm package type and temperature grade. Confirm the required external positive supply voltage range of 7.5 V to 13.2 V for proper system design. Ensure capacitor values meet the 1 µF ceramic specification for optimal performance.

Selection Notes

Select this component when a mixed driver/receiver configuration is required. It is suitable for systems where a dedicated +12 V rail is unavailable but an intermediate positive voltage can be provided. Compare against the ADM231L if fewer drivers are needed, or the ADM232L if four capacitors are acceptable for full internal conversion.

Part Context

The ADM239LAN belongs to the ADM2xxL family of line drivers and receivers. This series serves as an enhanced upgrade to the AD2xx family, offering lower power consumption and faster slew rates. The L-series parts are optimized to operate with smaller 1 µF capacitors compared to earlier generations.

Replacement Considerations

Public confirmed substitute part numbers: ADM239L.