MM54C221-MM74C221 is a dual monostable multivibrator with features such as wide supply voltage range, guaranteed noise margin, and low power consumption.
The MM54C221/MM74C221 is a monolithic complementary MOS integrated circuit featuring a negative-transition-triggered input and a positive-transition-triggered input, either of which can be used as an inhibit input, and a clear input. Once fired, the output pulses are independent of further transitions of the A and B inputs and are a function of the external timing components Cext and Rext.
| Wide supply voltage range | 4.5V to 15V |
|---|---|
| Guaranteed noise margin | 1.0V |
| Power Dissipation (Dual-In-Line) | 700 mW |
| Power Dissipation (Small Outline) | 500 mW |
| Operating Temperature Range | -65°C to + 150°C |
| Logical "1" Input Voltage (Voc = 5V) | 3.5 V |
| Logical "0" Input Voltage (Voc = 5V) | 1.5 V |
| Propagation Delay (Voc = 5V) | 250 500 ns |
The pulse width is approximately defined by the relationship tw = Cext Rext.
Yes, either the negative-transition-triggered or positive-transition-triggered input can be used as an inhibit input.
The maximum output duty cycle is Rext/Rexr + 1000.