DS3691N/NOPB

Overview

The DS3691N/NOPB is a low power Schottky TTL line driver designed to meet EIA standards RS-422 and RS-423. It features four buffered outputs with high source and sink current capability and internal short circuit protection. The device operates on a single +5V supply (4.75V to 5.25V) and includes TRI-STATE outputs in RS-422 mode. A mode control input allows selection between dual differential drivers or quad single-ended drivers. An external capacitor on the rise time control pin enables waveshaping for crosstalk suppression in single-ended applications.

Feature Summary

• Configurable operation as either dual differential RS-422 line drivers or quad single-ended RS-423 line drivers via a mode select pin
• TRI-STATE output capability in RS-422 mode with ±10V common-mode range during disable state
• Internal short circuit protection for both source and sink outputs prevents damage during fault conditions
• Rise time control pin supports external capacitance to slow signal edges and suppress near-end crosstalk

Applications

• RS-422 point-to-point communication interfaces
• Multipoint RS-423 serial data transmission systems
• Industrial equipment requiring isolated differential signaling
• Instrumentation bus connections

Procurement Notes

Verify component authenticity through authorized channels, as the datasheet indicates obsolete status from National Semiconductor prior to Texas Instruments acquisition. Confirm package integrity and pin alignment against the N16E molded DIP specification before integration into production assemblies.

Selection Notes

Select this component when a single-supply interface driver is required for RS-422 or RS-423 networks. Ensure the application utilizes a +5V logic family compatible with the specified input voltage thresholds. Verify that the operating temperature range of 0°C to +70°C meets environmental requirements.

Part Context

This part belongs to the DS1691A/DS3691 series of line drivers originally manufactured by National Semiconductor. Texas Instruments acquired National Semiconductor's assets, resulting in the NOPB suffix designation. The DS3691 variant specifically targets commercial temperature ranges compared to the industrial grade DS1691A.

Replacement Considerations

Pin-compatible alternatives include the AM26LS30. Verify electrical characteristics match specific system requirements when substituting.