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5V Pulse Generator

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Brocktune

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I have a couple TI SN74123 chips, but I'm having some trouble deciphering the datasheet to find out how to make a simple REPEATING pulse from this chip. In fact, I can't even get the thing to pulse once.

I would like to make a one-second pulse, then go low for 0.25 sec, then pulse for a second again, over and over until the end of time (I'm testing a relay). Does anyone, by chance, have a quick diagram that accomplishes this with the SN74123.

I've been trying to simulate it on Capture/Pspice A/D, but that program was written by infantile monkeys, and none of their SN74123 symbols has a pspice model associated with it.
 
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