CD4021BE

Shift Registers Overview

The CD4021BE is an 8-bit static shift register belonging to the Texas Instruments 4000B series of CMOS logic devices. It operates as a parallel-in serial-out converter, accepting eight asynchronous parallel data inputs and shifting them serially via a clock input. The device features a synchronous serial data input (Ds) for daisy-chaining multiple units. Key electrical specifications include a supply voltage range of 3 V to 18 V and an operating temperature range from -55°C to +125°C. It utilizes a 16-pin PDIP package.

Shift Registers Feature Summary

• Parallel-to-serial conversion capability with eight asynchronous parallel data inputs
• Synchronous serial data input allows for cascading multiple registers
• Asynchronous active HIGH parallel load input for immediate data capture
• Buffered parallel outputs available from the last three stages

Shift Registers Applications

• Data acquisition systems requiring parallel-to-serial interface conversion
• Cascaded expansion of I/O ports in microcontroller-based designs
• Digital signal processing front-ends for serial data transmission
• Industrial control systems operating in wide temperature environments

Shift Registers Procurement Notes

Verify the specific suffix 'BE' corresponds to the through-hole PDIP-16 package variant when sourcing. Confirm that the component meets the required 4000B series specifications for voltage and temperature ranges. Ensure compatibility with existing PCB footprints designed for standard DIP-16 packages. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Shift Registers Selection Notes

Select this component when an 8-bit parallel-to-serial conversion function is required within a CMOS logic design. It is suitable for applications needing a wide supply voltage range up to 18 V. Consider the PDIP-16 package for prototyping or through-hole manufacturing processes. Evaluate the need for buffered outputs on the final stages if direct driving of subsequent logic is necessary.

Shift Registers Part Context

This part belongs to the widely used 4000B series of CMOS digital logic integrated circuits. These components are known for their high noise immunity and broad power supply flexibility. The CD4021BE specifically addresses the need for static shift register functionality within this family, providing a reliable solution for data serialization tasks in general-purpose electronic applications.

Shift Registers Replacement Considerations

Compatible substitutes include the CD4021B without the 'E' suffix for equivalent performance. Other manufacturers offer pin-compatible alternatives such as the HCC4021B or MC14021B. Verify that any replacement maintains the same 16-pin DIP package and electrical characteristics.