View m74hc221a datasheet:

M74HC221A DUAL MONOSTABLE MULTIVIBRATOR HIGH SPEED : tPD = 24 ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: STAND BY STATE : ICC=4µA (MAX.) at TA=25°C ACTIVE STATE : ICC=700µA (TYP.) at VCC = 6V DIP SOP TSSOP HIGH NOISE IMMUNITY: VNIH = VNIL = 28 % VCC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE: ORDER CODES |IOH| = IOL = 4mA (MIN) PACKAGE TUBE T & R BALANCED PROPAGATION DELAYS: DIP M74HC221AB1R tPLH ? tPHL SOP M74HC221AM1R M74HC221ARM13TR WIDE OPERATING VOLTAGE RANGE: TSSOP M74HC221ATTR VCC (OPR) = 2V to 6V WIDE OUTPUT PULSE WIDTH RANGE : tWOUT = 150 ns ~ 60 s OVER AT VCC = 4.5 V triggering the output maintains the PIN AND FUNCTION COMPATIBLE WITH MONOSTABLE STATE for the time period 74 SERIES 221 determined by the external resistor Rx and capacitor Cx.