SMJ4464-15JDL

Overview

The SMJ4464-15JDL is a 262,144-bit (64K x 4) page mode dynamic random-access memory (DRAM) manufactured by Texas Instruments. It features a maximum access time of 150 ns and utilizes a common I/O interface. The device is housed in an 18-pin ceramic dual in-line package (CDIP) with side-brazed hermetic sealing. It supports RAS-only, CAS-before-RAS, and hidden refresh modes for data retention.

Feature Summary

• Hermetically sealed ceramic construction designed for high-reliability environments
• Page mode architecture enabling sequential address access within a row
• Supports multiple internal refresh methods including RAS-only, CAS-before-RAS, and hidden refresh

Applications

• Military aerospace systems requiring radiation tolerance
• Spacecraft avionics and satellite memory subsystems
• Nuclear instrumentation and control electronics

Procurement Notes

Verify the specific suffix 'JDL' against official Texas Instruments documentation to confirm pinout and electrical characteristics match the standard JDS variant. Ensure procurement channels provide valid traceability certificates required for space-grade components. Confirm RoHS exemption status as indicated by the lead content in related datasheets.

Selection Notes

Select this component when hermetic packaging and long-term reliability are critical requirements. The page mode operation offers efficiency for sequential data retrieval compared to random access DRAMs. Verify that the 150 ns speed meets system timing constraints and that the CDIP-18 footprint fits the target PCB layout.

Part Context

This part belongs to the SMJ series of space-grade memory devices produced by Texas Instruments. These components are specifically engineered to withstand harsh environmental conditions found in aerospace applications. The series typically includes various density and speed options while maintaining consistent hermetic packaging standards.

Replacement Considerations

Cross-reference with other Texas Instruments SMJ-series DRAMs such as the SMJ4464-15JDS for potential form-fit compatibility. Verify that any substitute maintains the same hermetic seal and radiation hardness levels required for the application.