74LS195 DIP 4-Bit Parallel-Access Shift Register
The 74LS195 is a high speed TTL integrated circuit that functions as a versatile 4-bit shift register with parallel-load and serial-load capabilities. This device features a combination of parallel-access inputs and a serial data input with J-K characteristics, providing enhanced control over data entry. All shifts and parallel loads occur synchronously on the positive-going transition of the clock pulse, ensuring stable data movement in high-frequency digital systems.
This IC is particularly useful for parallel-to-serial and serial-to-parallel data conversion. When the Shift/Load input is low, data is loaded into the four flip-flops from the parallel inputs. When the Shift/Load input is high, data is shifted from left to right. The first stage of the register includes a J-K type serial input, which allows for various logic operations on the incoming serial data stream. Additionally, an asynchronous master reset is provided to immediately clear all outputs to a low state.
KEY FEATURES
- 4-bit parallel-load and serial-shift capability
- Synchronous operation for high-speed timing stability
- J-K serial inputs for flexible data entry logic
- Asynchronous master reset for immediate system clearing
- Fully buffered clock and control inputs for signal integrity
- Standard 16 pin dual in line package
SPECIFICATIONS
- Supply Voltage 4.75V to 5.25V
- Operating Temperature 0 to 70 Celsius
- Logic Type TTL Low Power Schottky
- Maximum Clock Frequency 30MHz
- Typical Power Dissipation 70mW
- High Level Output Current -0.4mA
- Low Level Output Current 8mA
- Input Voltage High 2.0V Minimum
INTERFACES
- CLK Clock input positive edge triggered
- SH/LD Shift or parallel load control input
- J K Serial data inputs for the first stage
- A B C D Parallel data inputs
- CLR Master reset active low
- QA QB QC QD Parallel outputs
- QD BAR Complementary output of the last stage
- VCC Positive supply voltage
- GND Ground reference
