74LS194 DIP 4-Bit Bidirectional Universal Shift Register
The 74LS194 is a high speed TTL integrated circuit that serves as a versatile 4-bit universal shift register. It is designed to perform a variety of operations including parallel-to-serial conversion, serial-to-parallel conversion, left shifting, right shifting, and parallel data loading. This flexibility is achieved through two mode control inputs (S0 and S1) which determine the functional state of the register during each clock cycle.
All shifting and parallel loading operations occur synchronously with the positive-going transition of the clock pulse. The device also features independent serial inputs for both right-shift and left-shift operations, allowing for easy cascading into larger shift arrays. An asynchronous master reset is included to immediately clear the register to zero. Its multifunctional nature makes it a fundamental component for data manipulation in computer arithmetic units, communication interfaces, and digital control systems.
KEY FEATURES
- Four functional modes: Hold, Shift Right, Shift Left, and Parallel Load
- Fully synchronous data processing for high-speed stability
- Asynchronous master reset for immediate register clearing
- Independent serial inputs for left and right shifting
- Low power Schottky technology for optimal efficiency
- 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 25MHz
- Typical Power Dissipation 75mW
- High Level Output Current -0.4mA
- Low Level Output Current 8mA
- Input Voltage High 2.0V Minimum
INTERFACES
- CLK Clock input positive edge triggered
- S0 S1 Mode control inputs
- SR SER Serial data input for shift right
- SL SER Serial data input for shift left
- A B C D Parallel data inputs
- MR Master reset active low
- QA QB QC QD Parallel outputs
- VCC Positive supply voltage
- GND Ground reference
