74LS40 DUAL 4-INPUT NAND BUFFER
Package PDIP, SOIC Series 74LS
74LS40 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. 74LS40 contain DUAL 4-INPUT NAND BUFFER
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
40.pdf
74LS40 features
- Two Independent NAND Buffer Gates
- Open Collector Outputs Require External Pull-Up Resistors
- Fast Switching Times
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS40 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | A1 | NAND Buffer 1 Input 1 |
| 2 | B1 | NAND Buffer 1 Input 2 |
| 3 | NC | No Connection |
| 4 | C1 | NAND Buffer 1 Input 3 |
| 5 | D1 | NAND Buffer 1 Input 4 |
| 6 | X1 | NAND Buffer 1 Output |
| 7 | GND | Ground |
| 8 | X2 | NAND Buffer 2 Output |
| 9 | A2 | NAND Buffer 2 Input 1 |
| 10 | B2 | NAND Buffer 2 Input 2 |
| 11 | NC | No Connection |
| 12 | C2 | NAND Buffer 2 Input 3 |
| 13 | D2 | NAND Buffer 2 Input 4 |
| 14 | VCC | Positive Supply |
74LS40 applications
- Burglar alarm
- Freezer warning buzzer
More about 74LS40
74LS40 Alternative Equivalent
74LS37, 74LS30
Comments 0
Leave a comment