I seem to recall that the 4013 has active high set and reset inputs. The behavior you describe is what is supposed to occur when both are driven active at the same time. Are you sure you have the other forcing input inactive?
For what its worth, I've seen the 4013 used in a number of different circuits and it does what the datasheet claims. So, if my above guess is not enough to do the trick, perhaps you could post more details of how you are driving it.
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Check the power pins. If the power pin isn't connected, it'll look like the thing is working because it'll get powered by the pulse. When the pulse goes away, it'll drop back to ground.
Can you make it flip (or is that flop?) by triggering it manually?
--
Regards,
Robert Monsen
"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.
Maybe I am working under a misconception but I have tried everything and can't seem to get this to work.
The problem I am having is with the 4013. I can get it to work in the basic bi-stable mode by pulsing CLK and it latches fine until the next pulse but I want to use SET to bring Q high on stay latched until a RESET from the counter turns it off. Nothing I try will work. I am delivering a clean square 200ms pulse and Q stays high only as long as the pulse lasts. Do set and reset not latch the way CLK does? I have all the inputs on the second flip flop and CLK and DATA tied to low.
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Figured it out. When all else fails, replace the chip.
Glenn
I see you've figured it out already. But for what it's worth, I recall many times where 4013s wouldn't clock properly on a protoboard, even though the same circuit worked fine on a PC board. The common "fix" around the lab was to put a 10K resistor in series with the chip clock or data line. Nobody could ever determine exactly what was going on (think we only had 20 MHz scopes back then), but the assumption was that the protoboard inter-hole capacitance was causing mischief somewhere. The typical circuits were not at high clock rates, probably all under 100 kHz, and the problems existed even when we slowed the clock way down. 4013s with 10K resistors got to be a joke around the lab. Never seemed to have these problems with anything else.
Best regards,
Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis
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