STMicroelectronics M54HC423A
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. These inputs are valid for rising/falling signals, (tr – tf – 1 sec).- Min Voltage : 2V
- Max Voltage : 6V
- Max Operating Temp : 125°C
- Min Operating Temp : -55°C
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| Part No. | M54HC423A |
|---|---|
| Datasheet | M54HC423A Download |
| Manufacturer |  STMicroelectronics |
| Description | DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR |
| Buy | Stock & Price |
DESCRIPTION
There are two trigger inputs, A INPUT (negative edge) and B INPUT (positive edge). 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 it makes the MONOSTABLE period longer. Limit for values of Cx and Rx : Cx : NO LIMIT Rx : VCC < 3.0 V 5 K Ω to 1 M Ω VCC ≥ 3.0 V 1 K Ω to 1 M Ω All inputs are equipped with protection circuits against static discharge and transient excess voltage. October 1993 PIN CONNECTIONS (top view) NC = No Internal Connection 1/14 M54/M74HC423/423A SYSTEM DIAGRAM TIMING CHART 2/14 M54/M74HC423/423A BLOCK DIAGRAM Note : (1) Cx, Rx, Dx are external components. (2) Dx is a clamping diode. The external capacitor is charged to VCC inthe stand-by state, i.e. no trigger. When the supply voltage is turned off Cx is discharged mainly through an internal parasitic diode (see figures).
