CD4021BCMX

Shift Registers Overview

The CD4021BCMX is an 8-stage parallel input/serial output shift register manufactured by onsemi. It operates within a supply voltage range of 3.0V to 15V and supports operating temperatures from -55°C to +125°C. The device features symmetrical output characteristics with standard B series drive capabilities, high noise immunity at 0.45 VDD, and low power TTL compatibility. It includes static discharge protection diodes to VDD and VSS.

Shift Registers Feature Summary

• Parallel-to-serial data conversion capability via asynchronous jam inputs and synchronous serial shifting controlled by a clock signal.
• High noise immunity and low power consumption compatible with TTL logic families.
• Symmetrical output source and sink current capabilities conforming to standard B series drive specifications.

Shift Registers Applications

• Data acquisition systems requiring parallel-to-serial conversion
• Industrial control applications involving remote I/O expansion
• General-purpose digital logic circuits requiring static shift registers

Shift Registers Procurement Notes

Verify the specific package configuration for the CD4021BCMX suffix, which indicates a tape and reel format. Confirm that the ordering code matches the required 16-lead Small Outline Integrated Circuit (SOIC) JEDEC MS-012 specification. Ensure the component meets the recommended operating conditions for the intended application environment.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with parallel load functionality is required in a compact surface-mount form factor. Consider the wide supply voltage range and high noise immunity for robust operation in electrically noisy environments. Verify that the SOIC package dimensions fit the available PCB space constraints.

Shift Registers Part Context

This part belongs to the CD4000B series of CMOS logic devices, designed for general-purpose digital applications. It provides a reliable solution for data storage and transfer tasks where low power consumption and high noise immunity are critical requirements for system stability.

Shift Registers Replacement Considerations

Compatible replacements include other 8-stage parallel-in serial-out shift registers from the CD4000B family, such as the CD4021BM or CD4021BCM, provided they match the SOIC-16 package and electrical specifications.

Shift Registers FAQ

How does the parallel/serial control input function?

When the control input is logical '1', data is asynchronously jammed into each stage. When it is logical '0', data is serially shifted synchronously with the positive clock transition.

What is the maximum supply voltage for this device?

The recommended operating supply voltage range is 3.0V to 15V, with absolute maximum ratings extending up to 18V.