Device usage: The 74HC283 (a 4-bit binary adder with carry) can be used to implement which kind of adder directly?

Introduction / Context:
The 74HC283 is a standard CMOS implementation of a 4-bit parallel binary full adder with carry-in and carry-out. Recognizing its native capability helps in choosing additional logic when building wider adders or BCD adders.

Given Data / Assumptions:

• Part: 74HC283.
• Features: 4-bit addition, carry-in, carry-out.
• Target: identify which adder type it directly realizes.

Concept / Approach:
A full adder accepts two operand bits and a carry-in, producing a sum bit and carry-out. The 74HC283 integrates four such stages for 4-bit vectors, supporting ripple-carry cascading for wider adders. BCD addition requires decimal correction logic (add 6 when needed), which is not built into the 74HC283, so it is not a direct BCD adder.

Step-by-Step Solution:

Verification / Alternative check:
Databook descriptions and reference schematics label the 74HC283 as a 4-bit binary full adder with carry look-ahead compatible cascading.

Why Other Options Are Wrong:

• 4-bit BCD / 8-bit BCD: Need decimal-correction circuits (not provided internally).
• 8-bit full: Requires cascading two chips; one 74HC283 alone is 4-bit.

Common Pitfalls:
Assuming a single chip covers wider bit-widths; overlooking decimal-correction requirements for BCD.

Final Answer:
4-bit full