Microchip's own reliability data show that chips made using their 0.25uM process are much more reliable than those using their 0.18uM process. This is perhaps not so surprising.
But I've failed to find a way of knowing which process is used for any particular chip, other than finding the chip mentioned in process change notifications.
Anyone know where one should expect to find this information? If it's in the datasheets, I've certainly overlooked it despite searching.
Sylvia.
I haven't seen the process info for each device. It's interesting that they freely share a lot of data for process reliability and device reliability but you can't connect them together. Maybe some parts are made at multiple foundries using different processes?
Feature size and operating voltage go hand-in-hand, but don't always tell the tale... and labels can be misleading...
For example, a touted "0.18um process", nominally 1.8V operating, may actually be the feature size of "innards" and have on the same chip, process steps with a 0.25um or 0.35um feature size to allow terminal behavior to be 2.5V or 3.3V nominal.
I have designed chips that have 0.18um, 0.25um and 0.35um PLUS a HV voltage (extended drain, source) all on the same chip. ...Jim Thompson
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