MC14021BCPG

Shift Registers Overview

The MC14021BCPG is an 8-bit static shift register from the 4000 series logic family, manufactured by onsemi. It features asynchronous parallel input and serial output capabilities within a single monolithic structure using MOS P-channel and N-channel enhancement mode devices. The component operates with a supply voltage range of 3.0 Vdc to 18.0 Vdc and supports ambient temperatures from -55 °C to +125 °C. It is housed in a 16-pin Plastic Dual In-line Package (PDIP) with Case Number 648.

Shift Registers Feature Summary

• Asynchronous parallel data loading allows immediate input without clock synchronization.
• Serial output capability enables efficient data transmission over fewer lines.
• Full static operation ensures stable state retention without continuous clocking.
• Double diode input protection guards against high static voltages and electric fields.

Shift Registers Applications

• Parallel-to-serial data conversion
• Synchronous and asynchronous parallel input data queueing
• General-purpose register applications requiring low power consumption

Shift Registers Procurement Notes

Verify the specific ordering suffix 'CPG' corresponds to the PDIP-16 package configuration as documented in the manufacturer's ordering information. Confirm that the device code matches the MC14021B specification for asynchronous parallel input functionality. Ensure compliance with the maximum ratings regarding DC supply voltage and input/output voltage ranges to prevent damage to the high-impedance circuit.

Shift Registers Selection Notes

Select this component when asynchronous parallel loading is required rather than synchronous operations found in the MC14014B variant. It is suitable for designs needing robust noise immunity and low power dissipation. Verify that the 16-pin PDIP footprint fits the target PCB layout constraints. Consider the operating temperature range requirements for the specific application environment.

Shift Registers Part Context

This part belongs to the MC14014B/MC14021B family of 8-bit static shift registers. While the MC14014B offers synchronous parallel input, the MC14021B provides asynchronous parallel input. Both share identical pinouts and electrical characteristics, allowing for functional substitution based on timing requirements. They are designed for general-purpose digital logic applications.

Shift Registers Replacement Considerations

The MC14021BCP serves as a pin-for-pin replacement for the CD4021B. Designers should verify compatibility with existing board layouts if substituting from other manufacturers' CMOS logic families offering similar 8-bit shift register functions.

Shift Registers FAQ

What is the difference between the MC14021B and MC14014B?

The primary difference is the parallel input method: the MC14021B uses asynchronous parallel input, while the MC14014B uses synchronous parallel input. Both share the same pinout and serial output functionality.

How does the device handle unused inputs?

Unused inputs must always be tied to an appropriate logic voltage level, either VSS or VDD, to ensure proper operation and prevent damage due to high static voltages.