Can I use a simple monostable multivibrator to provide a trigger signal directly to my DAQ Card 6533?

[Tired and alone]

I want to trigger my digital I/O from a DAQ Card 6533 using an external source. In the long run I hope to use a sound card output, that may have been processed, but for now I plan to use a simple monostable multivibrator that generates an output when I hit a switch. Is it safe to connect the output from my monostable, a 74HCT221, directly to the external trigger pin on the 6533? I assume I just need to ensure the output from the monostable does not exceed 5V?

[Filipe A.]

Hello;

As long as the output of your monostable doesn't go above 5V and 2.5mA, you shouldn't have any problems. Also, make sure the output signal of the monostable follow the TTL standars, as far as rise time and some other things.
Hope this helps.
Filipe

[Tired and alone]

Thanks Filipe

I have used a TTL 74121 monostable to perform my external triggering, and things seem to work fine. I hope to replace this make shift trigger with something like the output from my soundcard, but I guess I will need to perform some hardware processing on this signal first.

Once again, thanks for your help.