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Monostable multivibrator is another used configuration of 555. You can get circuit in internet, start analyzing yourself following previous methods. Monostable multivibrator is used to eliminate keydebouncing problems,delay generation and so many applications. But the trigger pin(pin2) is a mysterious one,it mostly accepts input from a digital IC. I tried to debounce a switch using monostable, by keeping one end of switch in gnd and other to the trigger of pin2, but i was not able to get key debouncing. One of my friend had done metal detection using this. His aim was to detect a metal, if detected robot has to stop for 3second. So he used conductor strip to test the metal. He kept metal strip on the lower portion of robot touching the ground, so that if a metal comes on way current flow through the circuit. He connected it to the trigger of monostable to produce delay of 3seconds. But it does not worked properly. Supply voltage – 4.5V to 15V, max. frequency – 500khz to hours , maximum output current- 200 mA