M74HC423/423A

The M54/74HC423/423A are high speed CMOS MONOSTABLE multivibrators fabricated with silicon gate C2MOS technology.

They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. There are two trigger inputs, AINPUT (negative edge) and B INPUT (positive edge). These inputs are valid for rising/falling signals, (t_R t_F 1 sec). After triggering the output maintains the MONOSTABLE state for the time period determined by the external resistor Rx and capacitor Cx.

Two different pulse width constant are available: K 0.46 for HC423 K 1 for HC423A.

Taking CLR low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLEperiod itmakes theMONOSTABLE period longer. Limit for values of Cx and Rx : Cx : NO LIMIT Rx : VCC < 3.0 V 5 K to 1 M VCC . 3.0 V 1 K to 1 M

All inputs are equipped with protection circuits against static discharge and transient excess voltage.