The M74HC4538 is a high speed CMOS monostable multivibrator fabricated with silicon gate C2MOS technology. Each multivibrator features both a negative A, and a positive B, edge triggered input, either of which can be used as an inhibit input. Also included is a clear input that when taken low resets the one shot. The monostable multivibrators are retriggerable. That is, they may be triggered repeatedly while their outputs are generating a pulse and the pulse will be extended. Pulse width stability over a wide range of temperature and supply is achieved using linear CMOS techniques. The output pulse equation is simply: PW = 0.7 (R)(C) where PW is in seconds, R in Omhs and C is in Farads. All the inputs are equipped with protection circuits against static discharge and transient excess voltage.
The M74HC4538 is a high-speed CMOS dual retriggerable monostable multivibrator fabricated with silicon gate C2MOS technology. It is pin and function compatible with the 74 series 4538 and features both negative and positive edge-triggered inputs for each multivibrator. The device includes a clear input to reset the one-shot and offers a wide output pulse width range from 120 ns to 60 seconds.
| Output pulse width range | 120 ns ~ 60 s |
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The output pulse width is calculated as PW = 0.7 (R)(C), where R is in Ohms and C is in Farads.
The clear input resets the one-shot when taken low, regardless of the trigger state.