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Logic Families and Their Characteristics

Q1:

Using the schematic diagram of a TTL NAND gate, determine the state of each transistor (ON or OFF) when all inputs are high.

A Q1-ON, Q2-OFF, Q3-ON, Q4-OFF

B Q1-ON, Q2-ON, Q3-OFF, Q4-OFF

C Q1-OFF, Q2-OFF, Q3-ON, Q4-ON

D Q1-OFF, Q2-ON, Q3-OFF, Q4-ON

ANS:D - Q1-OFF, Q2-ON, Q3-OFF, Q4-ON

At all high inputs, a NAND gate is off (based on truth table). At next state it will alternate, therefore OFF, ON, OFF, ON.



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