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AI Engineering
Hacker News·Jun 29·5 min read
Sandia National Labs SA3000 8085 CPU
TL;DR
In the late 1970s, there was a need for radiation-hardened integrated circuits (ICs) for weapons and space missions. Sandia National Laboratories developed the SA3000, a CMOS version of the Intel 8085 processor, increasing its transistor count from 6,500 to 18,000.
✦ Why It Matters
Engineers can leverage the SA3000's design principles for developing reliable components in radiation-prone environments.
Key Takeaways
- Understand the importance of radiation-hardened ICs.
- Explore CMOS technology for enhanced reliability.
- Consider voltage adjustments for performance in harsh environments.
- Utilize support chips to expand functionality in critical applications.
Full Summary
During the late 1970s and early 1980s, Sandia National Laboratories aimed to create radiation-hardened integrated circuits (ICs) for military and space applications, as commercial options were inadequate. They developed the SA3000, a CMOS (Complementary Metal-Oxide-Semiconductor) version of the Intel 8085 processor, which involved a significant increase in transistor count from 6,500 to 18,000.
The conversion process was complex, particularly for the instruction decoder, which was easier to implement in NMOS (N-Channel Metal-Oxide-Semiconductor) technology. The SA3000 was fabricated on 4-inch wafers using a 3-micron process, with a die size of 228-239 mils and an operating voltage range of 4.5-11V, while maintaining compatibility with 5V for testing.
This increased voltage provided greater resilience against radiation effects, which typically slow down device performance. Sandia also produced several support chips for the SA3000, enhancing its functionality in various applications.
These advancements ensured reliable operation in extreme conditions, crucial for military and space missions.