5 ms·
No, it's the other way around afaik. The memory likes to be hot, at least during operation.
by mafuy 4y ago
No, it's the other way around afaik. The memory likes to be hot, at least during operation.
- jeffbee 4y agoThat is correct. Flash must be heated to be programmed. If you cool it, it just draws more power to make up the difference. Power-off retention time is directly proportional to programming temperature.
- monocasa 4y agoNo, temperatures higher than about 70C cause excessive wear on NAND cells during writes.
- jeffbee 4y agoTotally backwards. Higher operating temperatures lead to longer retention, lower read error rates, and even faster reads and writes. Every aspect of NAND performance is better at higher temperatures. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8538043/#sec6-micromachines-12-01152title https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8538043/#sec6-m... Note that the 70° rating of commercial flash chips is the ambient temperature. The junction temperatures will be much higher.
- monocasa 4y agoThat's only to a point. That point is not much above ambient 70C. Hence why your citation doesn't bother testing above ambient 70C. For another example of what I'm talking about, here's a a Micron patent for NAND on die temperature alerting, explicitly providing both high temp and low temp alerts. https://patents.google.com/patent/US20190129648A1 https://patents.google.com/patent/US20190129648A1