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. 74LS123 d-c triggered multivibrators feature output pulse-duration control by three methods. The basic pulse time is programmed by the selection of external resistance and capacitance values (see typical application data).
74LS123 Features
- Two Independent Retriggerable Monostable Multivibrators
- Retriggerable to 100% Duty Cycle
- Input Clamp Diodes
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS123 Specifications
| Supply Voltage | 4.75 – 5.25Vdc |
| Maximum Clock Frequency | 40Mhz |
| Power Dissipation | 2mW/gate @100kHz |
| Minimum Output Current | 8mA |
| Propagation Delay | 10nS |
| Fan Out (TTL Loads) | 20 |
74LS123 Pinout Diagram
74LS123 Pin Description
| Pin No | Pin Name | Description |
| 1 | 1A | Data Input Pin 1A |
| 2 | 1B | Data Input Pin 1B |
| 3 | CLR’ | Invert Clear Pin |
| 4 | 1Q’ | Active Low Output 1 |
| 5 | 2Q | Active High Output 2 |
| 6 | 2 C(ext) | External Capacitor 2 |
| 7 | 2Rext/C(ext) | External Resistor/External Capacitor 2 |
| 8 | GND | Ground |
| 9 | 2A | Data Input Pin 2A |
| 10 | 2B | Data Input Pin 2B |
| 11 | 2CLR’ | Invert Clear Pin 2 |
| 12 | 2Q’ | Active Low Output 2 |
| 13 | 1Q | Active High Output 1 |
| 14 | 1 C(ext) | External Capacitor 1 |
| 15 | 1 R(ext)/C(ext) | External Resistor/External Capacitor 1 |
| 16 | VCC | Positive Supply |
74LS123 Circuit
Applications
- Timers
- Pulse generators
- waveform generators
- Sweep generators for CRTs (cathode ray tubes)
74LS123 Alternative Equivalent
74LS423,74LS122
Download 74LS123 Dual Mono Multivibrator With Clear Datasheet from the link given below.
