Datasheet for Signetic NE553?

There's no NE553 in the 1974 Signetics databook. I don't have a later one.

I almost want to say it has something to do with servo motor control, but I don't know why that comes to mind, and certainly don't know that it applies to the 553.

Signetics did come out with the NE558, which was a quad timer, sort of like 4 555's in a package (but since there weren't enough pins, it couldn't do all that the 555 did). Make sure you aren't reading the "8" for a "3". You should be able to find the pinouts for the 558, and comparing it to the circuit might show a match.

Michael

Just a thought but one of the things you can precisely do with the NE558 is generate delayed pulses relative to a trigger input, like a clock.

- James

I think you are correct - the NE558 does sound (and based on the PDF, looks) like the same item as what I have. Must be a bad imprint on the IC.

Thanks, it makes a lot more sense now!

John :-#)#