Govt. Exams
Entrance Exams
A 3-to-8 decoder requires 8 output lines. Each output is active for one unique combination of 3 inputs, requiring 8 AND gates, each with 3 inputs (one for each input variable or its complement).
For n input variables, truth table rows = 2^n. For 6 inputs: 2^6 = 64 rows.
CMOS has virtually zero static power consumption because complementary transistors prevent direct paths from supply to ground in steady state.
BCD represents decimal digits 0-9 using 4 bits. A single BCD counter counts from 0 to 9, after which it resets.
For n select lines, 2^n output lines are possible. Here 2^4 = 16, so 4 select lines are needed. This is a standard 16:1 multiplexer.
A 5-variable K-map requires 2^5 = 32 cells, typically arranged as two 4x4 grids representing the fifth variable's 0 and 1 states.
Setup time is the minimum duration that input data must remain stable before the active clock edge for proper capture by the flip-flop.
A 3-to-8 decoder has 3 input lines and 2^3 = 8 output lines, one for each possible input combination.
When J=1 and K=1, the J-K flip-flop toggles its state on each clock pulse.
A single NAND gate with both inputs tied together acts as a NOT gate (inverter).
