MC14028BD

Overview

The MC14028BD is a CMOS BCD-to-decimal decoder manufactured by onsemi. It accepts four inputs to provide ten decoded outputs, functioning as an 8421 BCD code converter or a 3-bit binary octal decoder with input D forced low. The device operates within a supply voltage range of 3.0 Vdc to 18 Vdc and supports ambient temperatures from -55 °C to +125 °C. It utilizes a 16-pin SOIC package.

Feature Summary

• Provides one-of-ten decoded decimal outputs for valid 8421 BCD codes
• Functions as a one-of-eight octal decoder when input D is held at logic zero
• Includes diode protection on all inputs against high static voltages
• Ensures low output states on all illegal input combinations

Applications

• Code conversion between binary formats
• Address decoding in memory systems
• Memory selection control circuits
• Demultiplexing applications
• Readout decoding for displays

Procurement Notes

Verify the specific suffix 'BD' corresponds to the SOIC-16 surface mount package configuration. Confirm RoHS compliance status if required, noting that lead-free variants typically carry a 'G' suffix (e.g., MC14028BDG). Ensure the ordering information matches the required shipping format, such as rail or tape and reel quantities.

Selection Notes

Select this component for designs requiring direct translation of BCD signals into active-high decimal lines. It is suitable for driving low-power TTL loads or low-power Schottky TTL loads over the rated temperature range. Consider expanded decoding configurations using multiple units for hexadecimal or larger binary conversions.

Part Context

This part belongs to the MC14000B series of CMOS logic devices. It serves as a functional equivalent to the CD4028B. The device is designed for general-purpose digital logic applications where reliable code conversion and address decoding are necessary within standard industrial temperature ranges.

Replacement Considerations

• MC14028BDG

FAQ

How does the MC14028BD handle invalid BCD input codes?

For all illegal input combinations, the device ensures that all outputs remain in a low state.

Can this device be used for hexadecimal decoding?

Yes, expanded decoding to hexadecimal (one-of-sixteen) can be achieved by utilizing other MC14028B devices in conjunction with the primary unit.