74LS74 Dual D-Type Flip-Flop
Package PDIP, SOIC Series 74LS
74LS74 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. 74LS74 contains two independent positive-edge-triggered D flip-flops with complementary outputs. The information on the D input is accepted by the flip-flops on the positive-going edge of the clock pulse.
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
74.pdf
74LS74 features
- Two Independent Negative Edge Triggered JK Flip-Flops
- Standard Pin Arrangement
- Fast Switching Times
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS74 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | CD | Digital Clock Pin |
| 2 | D | Data Pin |
| 3 | CP | Clear Pin |
| 4 | SD | Set Data Pin |
| 5 | Q1 | Output Pin Q1 |
| 6 | Q1' | Invert Output Pin Q1' |
| 7 | GND | Ground |
| 8 | Q2' | NAND Gate 4 Output 4 |
| 9 | Q2 | Invert Output Pin Q2' |
| 10 | SD | Set Data Pin |
| 11 | CP | Clear Pin |
| 12 | D | Data Pin |
| 13 | CD | Digital Clock Pin |
| 14 | VCC | Positive Supply |
74LS74 applications
- Data Storage
- Counters & State Machine Designs
- Logic Synchronizing
- Divide By Circuits
More about 74LS74
74LS74 Alternative Equivalent
74LS174,74LS175
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