CD4021BF

Shift Registers Overview

The CD4021BF is an 8-bit static shift register from the Texas Instruments CD4021B series, designed for serial-to-parallel and parallel-to-serial data conversion. It operates within a supply voltage range of 3V to 18V and supports a maximum clock frequency of 5MHz at 10V. The device features asynchronous active-high parallel load capability and buffered parallel outputs. It is housed in a 16-lead hermetic dual-in-line ceramic package (CDIP) with military-grade qualification.

Shift Registers Feature Summary

• Provides synchronous serial data input and eight asynchronous parallel data inputs for flexible data handling.
• Includes an asynchronous active-high parallel load input to instantly update output states without clock cycles.
• Features buffered parallel outputs on the last three stages to maintain signal integrity during high-speed operation.

Shift Registers Applications

• Military and defense electronic systems requiring radiation-hardened or high-reliability logic components.
• Industrial control interfaces utilizing serial-to-parallel data expansion.
• Automotive embedded systems demanding robust performance across extreme temperature ranges.

Shift Registers Procurement Notes

Verify the specific ordering suffix against the latest TI Package Option Addendum to confirm current production status. The CD4021BF designation indicates a hermetic ceramic package; ensure compatibility with existing board layouts and thermal management requirements. Confirm RoHS compliance status as military variants may differ from standard catalog parts. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and traceability documentation.

Shift Registers Selection Notes

Select this component when hermetic packaging is required for harsh environments or military specifications. Compare against plastic SOIC or TSSOP variants if environmental sealing is not critical. Ensure the design accommodates the physical dimensions of the 16-lead CDIP package. Verify that the system power supply remains within the specified operating voltage limits to guarantee reliable switching performance.

Shift Registers Part Context

This device belongs to the CD4000 series of AC CMOS logic functions, known for wide supply voltage operation and low power consumption. The CD4021B family specifically addresses applications needing efficient data storage and transfer between serial and parallel domains. It serves as a foundational building block for digital communication interfaces and memory expansion circuits in complex integrated systems.

Shift Registers Replacement Considerations

Consider CD4021BE for non-hermetic plastic DIP applications. Evaluate CD4021BM for surface-mount SOIC requirements. Check CD4021BPWR for thin shrink small-outline package needs. Verify functional equivalence before substituting any variant to ensure pinout and electrical characteristics match the original design intent.

Shift Registers FAQ

What is the maximum operating frequency of the CD4021BF?

The maximum clock frequency is 5MHz when powered at 10V.

Does the CD4021BF support parallel loading?

Yes, it includes an asynchronous active-high parallel load input for immediate data updates.

What type of package does the CD4021BF use?

It utilizes a 16-lead hermetic dual-in-line ceramic package (CDIP).