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. 74LS166 parallel-in or serial-in, serial-out shift registers have a complexity of 77 equivalent gates on a monolithic chip. They feature gated clock inputs and an overriding clear input.
74LS166 Features
- 8-Bit Shift Register which Can Shift Either Serial In or Parallel In Date
- Clamping Input Diodes
- Direct Overriding Clear
- Clock Frequency up to 35MHz
- Standard TTL Switching Voltages
74LS166 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 |
74LS166 Pinout Diagram
74LS166 Pin Description
Pin No | Pin Name | Description |
1 | SI | Serial Input |
2 | A | Parallel Input |
3 | B | Parallel Input |
4 | C | Parallel Input |
5 | D | Parallel Input |
6 | CI | Clock Inhibit Pin |
7 | CLK | Clock Pin |
8 | GND | Ground |
9 | CLR | Clear Pin |
10 | E | Parallel Input |
11 | F | Parallel Input |
12 | G | Parallel Input |
13 | QH | Output Pin |
14 | H | Parallel Input H |
15 | LOAD/SHIFT | Shift/Load Pin |
16 | VCC | Positive Supply |
Applications
- The shift registers are used for temporary data storage.
- The shift registers are also used for data transfer and data manipulation.
- The serial-in serial-out and parallel-in parallel-out shift registers are used to produce time delay to digital circuits.
74LS166 Alternative Equivalent
74LS165
Download 74LS166 8-bit Shift Register, Parallel Load Datasheet from the link given below.