555555555541. 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
5555555555 74. When the output of a tri-state shift register is disabled, the output level is placed in a: (a) float state (b) LOW state (c) high impedance state (d) float state and a high impedance state
555555555534. A 74HC147 priority encoder has ten active-LOW inputs and four active-LOW outputs. What would be the state of the four outputs if inputs 4 and 5 are LOW and all other inputs are HIGH? (a) (b) (c) (d)