Discussion
Match the following IC families with their basic circuits :
| a. TTL | 1. NAND |
| b. ECL | 2. NOR |
| c. CMOS | 3. Inverter |
Code : a b c
Answer: A
The matching is TTL with NAND, ECL with NOR and CMOS with the inverter, so the code is 1 2 3. TTL (transistor-transistor logic) has the NAND gate as its basic circuit. ECL (emitter-coupled logic) is built on a differential amplifier, whose basic circuit gives OR and NOR outputs, and CMOS is built from the complementary pair of transistors that make an inverter.
The other codes assign the NOR or the inverter to TTL, or NAND to CMOS, which does not agree with how each family is built.
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