74LS197-Preset Binary Counter
Package PDIP, SOIC Series 74LS
74LS197 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.74LS197 contains divide-by-two and divide-by-eight sections which can be combined to form a modulo-16 binary counter. Low Power Schottky technology is used to achieve typical count rates of 70 MHz and power dissipation of only 80 mW
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
0.pdf
74LS197 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | A1 | NAND Gate 1 Input 1 |
| 2 | B1 | NAND Gate 1 Input 2 |
| 3 | C1 | NAND Gate 1 Output |
| 4 | A2 | NAND Gate 2 Input 2 |
| 5 | B2 | NAND Gate 2 Input 2 |
| 6 | C2 | NAND Gate 2 Output |
| 7 | GND | Ground |
| 8 | C4 | NAND Gate 4 Output 4 |
| 9 | A4 | NAND Gate 4 Input 2 |
| 10 | B4 | NAND Gate 4 Input 2 |
| 11 | C3 | NAND Gate 3 Output |
| 12 | A3 | NAND Gate 3 Input 2 |
| 13 | B3 | NAND Gate 3 Input 2 |
| 14 | VCC | Positive Supply |
More about 74LS197
74LS00 Alternative Equivalent
74LS03, 74LS10, 74LS20, 74LS30
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