View m74hc123a datasheet:

M74HC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR HIGH SPEED : tPD = 23 ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: STAND BY STATE : ICC=4µA (MAX.) at TA=25°C ACTIVE STATE : ICC=200µA (MAX.) at VCC = 5V 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 M74HC123AB1R tPLH ? tPHL SOP M74HC123AM1R M74HC123ARM13TR WIDE OPERATING VOLTAGE RANGE: TSSOP M74HC123ATTR VCC (OPR) = 2V to 6V WIDE OUTPUT PULSE WIDTH RANGE : tWOUT = 120 ns ~ 60 s OVER AT VCC = 4.5 V period determined by the external resistor Rx and PIN AND FUNCTION COMPATIBLE WITH capacitor Cx. When Cx > 10nF and Rx > 10K?, 74 SERIES 123 the output pulse width