SNJ54LS90J

Overview

The SNJ54LS90J is a hermetically sealed, military-grade decade counter manufactured by Texas Instruments. It operates asynchronously with negative edge triggering and counts up through a decimal sequence. The device utilizes a 14-pin Ceramic Dual In-Line Package (CDIP) designed for high reliability in extreme environments. It supports divide-by-two and divide-by-five functions within a single integrated circuit.

Feature Summary

• Hermetically sealed ceramic construction ensures environmental protection
• Asynchronous negative edge triggered counting mechanism
• Integrated divide-by-two and divide-by-five functionality

Applications

• Military and defense electronic systems
• High-reliability aerospace instrumentation
• Harsh environment industrial control circuits

Procurement Notes

Verify the specific ordering suffix to confirm the CDIP package type and military qualification status. Confirm RoHS exemption requirements as this component is designated as non-RoHS compliant. Ensure the supplier provides traceability documentation consistent with military procurement standards for hermetically sealed devices.

Selection Notes

Select this component when military-grade reliability and hermetic sealing are mandatory. It serves as the LS-series equivalent to the standard SN5490A. Consider the CDIP package constraints regarding board space and mounting requirements compared to plastic packages.

Part Context

This part belongs to the SN54/74LS9x family of counters. It shares functional specifications with the SN54LS92 and SN54LS93 but differs in logic configuration. The 'J' suffix specifically denotes the ceramic dual in-line package suitable for radiation and moisture-resistant applications.

Replacement Considerations

SNJ54LS90J.A