Short "High" Output In Response to a "High" Input
You can easily configure a 555 to generate a pulse out on power-up, as shown below.

What happens in the circuit is that when S1 is made, +5V is sent to the chip immediately, powering it up, but TRIG and THRS are held low until C1 starts charging up through R1.

TRIG being low when +5V goes high forces OUT high until C1 charges up to about 2/3 Vcc, (3.3V) then THRS being at 3.3V or higher will drive OUT low until until S1 is opened and closed again, when the cycle will repeat.  

The LTspice .asc file is here if you want to play with the circuit.