DS3691M

Overview

The DS3691M is a low-power Schottky TTL line driver designed to meet EIA RS-422 and RS-423 standards. It features four buffered outputs with high source and sink current capability, short circuit protection, and TRI-STATE outputs in RS-422 mode. A mode control input selects between dual differential drivers (RS-422) or quad single-ended drivers (RS-423). The device operates on a single +5V supply with VEE grounded for RS-422, or dual ±5V supplies for RS-423. It includes a rise time control pin for external capacitor connection to suppress near-end crosstalk in single-ended applications.

Feature Summary

• Dual RS-422 or Quad RS-423 configurable operation via Mode Select pin
• TRI-STATE outputs in RS-422 mode with ±10V common-mode range
• Internal short circuit protection for both source and sink outputs
• External rise time control pin for crosstalk suppression

Applications

• RS-422 point-to-point communication interfaces
• RS-423 multipoint serial data transmission systems
• Industrial control networks requiring robust signal integrity

Procurement Notes

Verify the obsolete status of the DS3691M before procurement planning. Confirm that the active replacement part numbers, such as DS3691MX/NOPB, are suitable for the specific application requirements. Ensure compliance with RoHS directives if environmental regulations apply to the project.

Selection Notes

Select the DS3691M when compatibility with legacy AM26LS30 pinouts is required. Choose this component for designs needing flexible RS-422/RS-423 switching without additional logic. Verify that the SOIC package dimensions fit the available PCB space constraints.

Part Context

The DS3691M belongs to the National Semiconductor interface driver family, now managed by Texas Instruments following acquisition. It serves as a direct pin-compatible alternative to the AM26LS30, maintaining electrical characteristics while offering integrated TRI-STATE functionality in differential mode.

Replacement Considerations

The DS3691MX/NOPB is an active, lead-free version of the obsolete DS3691M. It maintains identical pinout and electrical specifications but complies with modern environmental standards.