If you take a look at the circuitry on some recent cheap multi-mode blinky lights you can find a likely analog IC fabricated right there on the surface of the s

If you take a look at the circuitry on some recent cheap multi-mode blinky lights you can find a likely analog IC fabricated right there on the surface of the small PCB and covered with a drop of epoxy, along with a few discrete components and battery holder. I found a more advanced digital application where the memory modules on our automatic titrator's exchangeable burets are fabricated on about a 5x20mm ceramic substrate and covered with the epoxy droplet with only the gold-plated connector pads showing. Only a limited byte capacity is needed, enough to contain the serial number and a line of variable text to store a couple user variables. Small feature size and physical chips off of a multi-IC silicon wafer are not exactly essential for such a simple application.