74LS195 4-bit Parallel-Access Shift Register
Package SOIC Series 74LS
74LS195 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. The 74LS195A is a high-speed 4-Bit Shift Register offering typical shift frequencies of 39 MHz. It is useful for a wide variety of registering and counting applications
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
195.pdf
74LS195 features
- Synchronous Serial or Parallel Data Transfers
- Asynchronous Master Reset
- High Speed up to 39MHz
- Input Clamping Diodes
- Standard TTL Switching Voltages
74LS195 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | MR | Master Reset (Active LOW) Input |
| 2 | J | First Stage J (Active HIGH) Input |
| 3 | K | First Stage K (Active LOW) Input |
| 4 | P0 | Parallel Data Input |
| 5 | P1 | Parallel Data Input |
| 6 | P2 | Parallel Data Input |
| 7 | P3 | Parallel Data Input |
| 8 | GND | Ground |
| 9 | PE' | Parallel Enable (Active LOW) Input |
| 10 | CP | Clock (Active HIGH Going Edge) Input |
| 11 | Q3' | Complementary Last Stage Output |
| 12 | Q3 | Parallel Output |
| 13 | Q2 | Parallel Output |
| 14 | Q1 | Parallel Output |
| 15 | Q0 | Parallel Output |
| 16 | VCC | Positive Supply |
74LS195 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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