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. 74LS125 bus buffers feature three-state outputs that, when enabled, have the low impedance characteristics of a TTL output with additional drive capability at high logic levels to permit driving heavily loaded bus lines without external pullup resistors.
74LS125 Features
- Four Independent Non-Inverting Buffer Gates
- Enabled Mode
- Fast Switching Times
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS125 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 |
74LS125 Pinout Diagram
74LS125 Pin Description
| Pin No | Pin Name | Description |
| 1 | E’ | Invert Enable Pin Of Buffer 1 |
| 2 | D | Data Input Of Buffer 1 |
| 3 | O | Output Of Buffer 1 |
| 4 | E’ | Invert Enable Pin Of Buffer 2 |
| 5 | D | Data Input Of Buffer 2 |
| 6 | O | Output Of Buffer 2 |
| 7 | GND | Ground |
| 8 | O | Output Of Buffer 3 |
| 9 | D | Data Input Of Buffer 3 |
| 10 | E’ | Invert Enable Pin Of Buffer 3 |
| 11 | O | Output Of Buffer 4 |
| 12 | D | Data Input Of Buffer 4 |
| 13 | E’ | Invert Enable Pin Of Buffer 4 |
| 14 | VCC | Positive Supply |
74LS125 Circuit
Applications
- A buffer or a voltage buffer is used to isolate input from the output. The buffer’s output state mirrors the input state.
74LS125 Alternative Equivalent
74LS126
Download 74LS125 Quad Bus Buffer Negative Enable Tri-State Datasheet from the link given below.
