i m using IC 4538 as a timer. in retriggerable mode, if once triggered and triggered again before time elapsed , then o/p remains high for time twice as per set. i want to use it as a non retriggerable. i want a circuit as when triggered once o/p will remain high for time t=RC, though it triggered again within time t , then it should ignore this trigger. but when i used the circuit given in datasheet on power on itself o/p is set to high for time t, goes low and again becomes high on next trigger. can any one tel me, where is my mistake?