Device recognition (TTL/CMOS): “74HC283” corresponds to which function in standard logic families?

Introduction / Context:
Recognizing common 74xx/HC device numbers is useful in digital design. The 74HC283 (and 74LS283) are classic 4-bit binary adders providing both Cin and Cout pins for cascading.

Given Data / Assumptions:

• Device code: 74HC283.
• Family: HC (High-speed CMOS), functionally similar to LS283 in TTL.

Concept / Approach:
The 74HC283 implements a 4-bit parallel adder. It adds two 4-bit operands plus a carry in to produce a 4-bit sum and a carry out, enabling simple ripple or look-ahead architectures for wider adders.

Step-by-Step Solution:

Verification / Alternative check:
Datasheets list pinouts for A3..A0, B3..B0, S3..S0, Cin, and Cout, confirming adder functionality.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing 74HC283 (adder) with 74HC138 (3-to-8 decoder) or 74HC00 (quad NAND).

Final Answer:
4-bit binary adder with carry in/out