Re: OT: MC12080 prescaler chip weirdness
That is a very fussy chip. The most common error is to drive the control signals with TTL level signals. That won't work reliably. They have to be very close to the rails. I don't remember the specs any longer, but IIRC you have to be within a diode drop of the positive supply, and the signals have to be clean. And, of course, the input signal has to be clean as well.toggle quoted messageShow quoted text
Prof. Thomas H. Lee
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On 3/20/2021 10:46, Michael Dunn wrote:
A Fluke counter I’ve been fixing up and adding homebuilt options to is missing the prescaler option. The vast majority of current chips seem to be binary, so, short of also dividing the reference clock, I decided to use a decade divider, an NOS MC12080 ÷10/20/40/80 chip.