74LS423 Retriggerable Monostable Multivibrators
Series 74LS
74LS423 overview
The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS423 d-c triggered multivibrators feature output-pulse width control by three methods. The basic pulse time is programmed by the selection of external resistance and capacitance values.
Datasheet
sn74ls423.pdf
74LS423 features
- Identical to 74LS123 Except they cannot be Triggered via Clear
- DC Triggered from Active High or Active Low
- Retriggerable for Very Long Output Pulses
- Overriding Clear Terminates Output Pulse
- Standard TTL Switching Voltages
74LS423 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | 1A | Input 1 Of Monostable Multivibrator 1 |
| 2 | 1B | Input 2 Of Monostable Multivibrator 1 |
| 3 | 1CLR' | Clear Pin (Active Low) 1 |
| 4 | 1Q' | Output Of Monostable Multivibrator 1 (Active Low) |
| 5 | 2Q | Output Of Monostable Multivibrator 2 (Active High) |
| 6 | 2C(ext) | External Capacitor 2 |
| 7 | 2R(ext)/C(ext) | External Resistor/Capacitor 2 |
| 8 | GND | Ground |
| 9 | 2A | Input 1 Of Monostable Multivibrator 2 |
| 10 | 2B | Input 2 Of Monostable Multivibrator 2 |
| 11 | 2CLR' | Clear Pin (Active Low) 2 |
| 12 | 2Q' | Output Of Monostable Multivibrator 2 (Active Low) |
| 13 | 1Q | Output Of Monostable Multivibrator 1 (Active High) |
| 14 | 1C(ext) | External Capacitor 1 |
| 15 | 1R(ext)/C(ext) | External Resistor/Capacitor 1 |
| 16 | VCC | Positive Supply |
74LS423 applications
- The monostable multivibrator is used as delay and timing circuits
- It is also used for temporary memories
- It is often used to trigger another pulse generator
- It is used for regenerating old and worn out pulses
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