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
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 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 |
74LS240 Pinout Diagram
74LS240 Pin Description
| Pin No | 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 |
Applications
- Communicate digital signals across circuit-board traces and cables
74LS240 Alternative Equivalent
74LS241, 74LS245
Download 74LS240 Octal Inverter Line Driver Tri-State Datasheet from the link given below.
