74LS194 4-bit Bi-directional Shift Register
Package SOIC-16, PDIP-16 Series 74LS Status Active (15-Sep-2021)
74LS194 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. 74LS194 the bidirectional shift register is designed to incorporate virtually all of the features a system designer may want in a shift register; they feature parallel inputs, parallel outputs, right-shift, and left-shift serial inputs, operating-mode-control inputs, and a direct overriding clear line
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
sn74ls194a.pdf
74LS194 features
- Parallel Inputs and Outputs
- Four Operating Modes, Synchronous, Right Shift, Left Shift and Pause
- High Speed up to 25MHz
- Positive Edge Triggered Clocking
- Standard TTL Switching Voltages
74LS194 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | CLR' | Clear Pin |
| 2 | SR SER | Shift Right Serial Input |
| 3 | A | Parallel Input |
| 4 | B | Parallel Input |
| 5 | C | Parallel Input |
| 6 | D | Parallel Input |
| 7 | SL SER | Shift Left Serial Input |
| 8 | GND | Ground |
| 9 | S0 | Serial Pin |
| 10 | S1 | Serial Pin |
| 11 | CLK | Clock Pin |
| 12 | QD | Output Pin |
| 13 | QC | Output Pin |
| 14 | QB | Output Pin |
| 15 | QA | Output Pin |
| 16 | VCC | Positive Supply |
74LS194 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.
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