The Texas Instruments CD74HCT164E is a high-speed CMOS logic 8-bit serial-in parallel-out shift register with asynchronous reset. This component is designed to shift data on the positive edge of the clock (CLK) signal. A low signal on the Reset (CLR) pin resets the shift register, setting all outputs to a low state regardless of input conditions. The device offers two Serial Data inputs (A and B), with either serving as a Data Enable control. This flexibility in data handling makes the CD74HCT164E versatile for various digital logic applications.
The CD74HCT164E operates within a wide voltage range of 2 to 6 volts, providing compatibility with various logic levels and allowing for integration into a range of electronic circuits. It features buffered inputs, asynchronous reset, balanced propagation delay, and transition times. This shift register is optimized for significant power reduction compared to LSTTL logic ICs, contributing to more efficient designs. The device is available in several package types, including SOIC and PDIP, facilitating easy integration into both new designs and existing layouts.
Integrated Circuits (ICs)
Shift registers are fundamental components in digital electronics, primarily used for data storage, transfer, and manipulation. They operate by shifting their internal registers' bits in a specific direction (either left or right) upon receiving clock pulses, thus enabling serial-to-parallel or parallel-to-serial data conversion. Shift registers like the CD74HCT164E play a crucial role in applications requiring sequential logic operations, including data serialization for communication interfaces, temporary data storage, or expanding the number of outputs in microcontroller applications.
When selecting a shift register for a particular application, engineers should consider several key factors, including the number of bits (register size), clock frequency, voltage levels, and the presence of additional features such as asynchronous reset. The operating voltage range is important for ensuring compatibility with other components in the system, while the maximum clock frequency determines the speed at which data can be shifted. Asynchronous reset capabilities allow for immediate clearing of the register's contents, which can be critical in applications requiring rapid initialization or error recovery.
The CD74HCT164E, with its high-speed operation, wide voltage range, and asynchronous reset feature, is well-suited for a variety of digital logic applications. Its compatibility with both CMOS and LSTTL logic levels, along with a significant reduction in power consumption compared to LSTTL devices, makes it a versatile choice for engineers designing efficient and reliable digital systems.