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. 74LS299 Schottky TTL eight-bit universal registers feature multiplexed inputs/outputs to achieve full eight-bit data handling in a single 20-pin package. Two function-select inputs and two output-control inputs can be used to choose the modes of operation listed in the function table
74LS299 Features
- Multiplexed Input/Outputs for Data Hold, Shift Right, Shift Left and Load Data
- Operates with Outputs Enabled or at High Z
- 3-State Outputs Drive Bus Lines Directly
- Can be Cascaded for N-Bit Word Lengths
- Standard TTL Switching Voltages
74LS299 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 |
74LS299 Pinout Diagram
74LS299 Pin Description
| Pin No | Pin Name | Description |
| 1 | S0 | Select Pin 0 |
| 2 | OE1 | Enable Output Pin 1 |
| 3 | OE2 | Enable Output Pin 2 |
| 4 | I/O6 | Input/Output Pin 6 |
| 5 | I/O4 | Input/Output Pin 4 |
| 6 | I/O2 | Input/Output Pin 2 |
| 7 | I/O0 | Input/Output Pin 0 |
| 8 | Q0 | Output Pin |
| 9 | MR | Asynchronous Master Reset Pin |
| 10 | GND | Ground |
| 11 | DS0 | Digital signal Pin 0 |
| 12 | CP | Clock Pulse |
| 13 | I/O1 | Input/Output Pin 1 |
| 14 | I/O3 | Input/Output Pin 3 |
| 15 | I/O5 | Input/Output Pin 5 |
| 16 | I/O7 | Input/Output Pin 7 |
| 17 | Q7 | Output Pin |
| 18 | DS7 | Digital signal Pin 7 |
| 19 | S1 | Select Pin 1 |
| 20 | VCC | Positive Supply |
Applications
- Storing data in digital form.
74LS299 Alternative Equivalent
Download the 74LS299 8-bit Universal Shift/Storage Register Datasheet from the link given below.
