74LS166 8-bit Shift Register, Parallel Load
Package SOIC Series 74LS
74LS166 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. 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.
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
166.pdf
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 pinout
| 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 |
74LS166 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.
More about 74LS166
74LS166 Alternative Equivalent
74LS165
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