74LS240 Octal Inverter Line Driver Tri-State
Package PDIP, SOIC Series 74LS
74LS240 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. 74LS240 buffers/line drivers are designed to improve both the performance and PC board density of 3-STATE buffers/ drivers employed as memory address drivers, clock drivers, and bus-oriented transmitters/receivers
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
240.pdf
74LS240 features
- Tri-State Outputs Drive Bus Lines Directly
- PNP Inputs Reduce DC Loading on Bus Lines
- Hysteresis Inputs
- Designed for use as Bus Oriented Transmitters/Receivers
- Standard TTL Switching Voltages
74LS240 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | 1G' | Channel 1 output enable |
| 2 | 1A1 | Channel 1, (A) side 1 |
| 3 | 2Y4 | Channel 2, Y side 4 |
| 4 | 1A2 | Channel 1, (A) side 2 |
| 5 | 2Y3 | Channel 2, Y side 3 |
| 6 | 1A3 | Channel 1, (A) side 3 |
| 7 | 2Y2 | Channel 2, Y side 2 |
| 8 | 1A4 | Channel 1, (A) side 4 |
| 9 | 2Y1 | Channel 2, Y side 1 |
| 10 | GND | Ground |
| 11 | 2A1 | Channel 2, (A) side 1 |
| 12 | 1Y4 | Channel 1, Y side 4 |
| 13 | 2A2 | Channel 2, (A) side 2 |
| 14 | 1Y3 | Channel 1, Y side 3 |
| 15 | 2A3 | Channel 2, (A) side 3 |
| 16 | 1Y2 | Channel 1, Y side 2 |
| 17 | 2A4 | Channel 2, (A) side 4 |
| 18 | 1Y1 | Channel 1, Y side 1 |
| 19 | 2G' | Channel 2 output enable |
| 20 | VCC | Positive Supply |
74LS240 applications
- Communicate digital signals across circuit-board traces and cables
More about 74LS240
74LS240 Alternative Equivalent
74LS241, 74LS245
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