74LS540 Octal Inverter Buffer/Line Driver Tri-State
Package SOIC Series 74LS
74LS540 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. The 74LS540 is octal buffers and line drivers with the same functions as the LS240 and LS241, but with pinouts on the opposite side of the package
Datasheet
540.pdf
74LS540 features
- Identical to 74LS240 with Different Pinouts
- Hysteresis at Inputs to Improve Noise Margin
- PNP Inputs Reduce Loading
- 3-State Outputs Drive Bus Lines
- Input Clamp Diodes
74LS540 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | E1 | Enable Pin 1 |
| 2 | D1 | Input Of Inverter Buffer 1 |
| 3 | D2 | Input Of Inverter Buffer 2 |
| 4 | D3 | Input Of Inverter Buffer 3 |
| 5 | D4 | Input Of Inverter Buffer 4 |
| 6 | D5 | Input Of Inverter Buffer 5 |
| 7 | D6 | Input Of Inverter Buffer 6 |
| 8 | D7 | Input Of Inverter Buffer 7 |
| 9 | D8 | Input Of Inverter Buffer 8 |
| 10 | GND | Ground |
| 11 | Y8 | Output Of Inverter Buffer 8 |
| 12 | Y7 | Output Of Inverter Buffer 7 |
| 13 | Y6 | Output Of Inverter Buffer 6 |
| 14 | Y5 | Output Of Inverter Buffer 5 |
| 15 | Y4 | Output Of Inverter Buffer 4 |
| 16 | Y3 | Output Of Inverter Buffer 3 |
| 17 | Y2 | Output Of Inverter Buffer 2 |
| 18 | Y1 | Output Of Inverter Buffer 1 |
| 19 | E2 | Enable Pin 2 |
| 20 | VCC | Positive Supply |
74LS540 applications
- Maintain the specific pH value
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