74LS122 Retriggerable Monostable Multivibrator
Package PDIP, SOIC Series 74LS
74LS122 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. 74LS122 re-triggered multivibrators feature output pulse-duration control by three methods. The basic pulse time is programmed by selection of external resistance and capacitance values (see typical application data)
Key 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
Datasheet
122.pdf
74LS122 features
- DC Triggered Multivibrators with Pulse Width Control
- Overriding Clear Terminates Output Pulse
- DC Triggered from Active-High or Active-Low
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS122 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | A1 | Data Input Pin A1 |
| 2 | A2 | Data Input Pin A2 |
| 3 | B1 | Data Input Pin B1 |
| 4 | B2 | Data Input Pin B2 |
| 5 | CLR | Clear Pin |
| 6 | Q1 | Output Pin |
| 7 | GND | Ground |
| 8 | Q2 | Output Pin |
| 9 | Rint | Internal Resistor |
| 10 | NC | Not Connected |
| 11 | Cext | External Capacitor |
| 12 | NC | Not Connected |
| 13 | Rext/Cext | External Resistor/External Capacitor |
| 14 | VCC | Positive Supply |
74LS122 applications
- Delay and timing circuits.
Application circuit
More about 74LS122
74LS122 Circuit
Here is a simple monostable multivibrator circuit using 2n4401 transistors
74LS122 Alternative Equivalent
74LS123
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