ADM2209EARU

Overview

The ADM2209EARU is a dual-port RS-232 transceiver in a 38-lead TSSOP package. It integrates six drivers and ten receivers, operating from a single +12 V supply via an onboard charge pump that eliminates the need for a negative rail. The device supports data rates up to 460 kbps under standard loads and up to 920 kbps with reduced capacitance. It features a dedicated standby supply pin (VSTBY) ranging from 3.15 V to 5.5 V, which keeps one receiver per port active for system wake-up capabilities while the main logic is powered down.

Feature Summary

• Integrates onboard dc-to-dc converter to generate negative voltage from a single positive supply
• Provides fail-safe receiver outputs that default to high logic levels when inputs are open
• Includes Schmitt trigger inputs on receivers to ensure noise immunity during signal transitions
• Features independent standby power supply to maintain peripheral monitoring during low-power modes

Applications

• Desktop and notebook personal computers
• Industrial printers and peripherals
• Modems and serial communication interfaces

Procurement Notes

Verify the specific suffix EA against the manufacturer's current ordering guide to confirm the industrial temperature range and RoHS compliance status. Ensure the selected package option matches the RU-38 designation for the 38-lead TSSOP form factor required by the design.

Selection Notes

Select this component when a single-chip solution for two full RS-232 ports is required without external negative voltage generation. Consider the 460 kbps guaranteed rate for Laplink compatibility or the higher 920 kbps capability if load conditions allow. Verify that the application environment requires the specified ESD and EMC protection levels.

Part Context

This part belongs to the ADM2209E family of rugged dual-port RS-232 line drivers. The series is designed to meet EIA/TIA-232-E specifications while providing enhanced electromagnetic compatibility. The device simplifies board layout by consolidating two complete serial ports into a single integrated circuit.

Replacement Considerations

Direct replacements include other dual-port RS-232 transceivers with similar driver/receiver counts and single-supply operation. Verify pinout compatibility and voltage level translation requirements before substituting.