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Strange bug with timer and oneshot

Question asked by J3627 on Aug 14, 2014
Latest reply on Aug 14, 2014 by J3627

Intent was to vary the timer so the first time at turn-on, it only does a short mute, and then for a fault during normal operation, it does a much longer mute.  So I made this circuit, and it behaves bizarrely.  On turn-on, the OneShot timer rises to 1 after the 2 second delay, even though the Timer output that's driving it doesn't rise to 1 until the 10 second delay.  The OneShot is predicting the future?


After turn-on, the OneShot stays forever on, and switching the switch causes the Timer to change after a 10 second delay, which is as expected.


2014-08-14 11_13_56-Analog Devices - SigmaStudio - [race condition.dspproj].png


So I think it's a bug?  I'll try to find another way to implement the desired function