Input connections for CD14538BE multivibrator

I'm building a prototype PWM using the CD14538 dual monostable multivibrator.  My question is this:  my signal is normally high, triggers to zero volts.  Can I use this signal to trigger the IC?  I can use an inverter if necessary, would rather avoid the extra part if it's possible.  Specific input circuit would be greatly appreciated.  Thank you.