how long does an integrated circuit last in storage?
design a few of them with the data just burned in. no capacitors to fail, you could get your redundancy by just making a couple dozen of each. design them to wait a few seconds after power on, and then start spitting out the data and a clock. label the power, ground, serial out and data pins.
given those pins, there isn't anything else you could do with it besides hook it up and see what it has to say. and all you need to read it is a stable power supply, and sufficiently fast analog to digital converters.
design a few of them with the data just burned in. no capacitors to fail, you could get your redundancy by just making a couple dozen of each. design them to wait a few seconds after power on, and then start spitting out the data and a clock. label the power, ground, serial out and data pins.
given those pins, there isn't anything else you could do with it besides hook it up and see what it has to say. and all you need to read it is a stable power supply, and sufficiently fast analog to digital converters.