19. Gate A has tPLH = tPHL = 6 ns. Gate B has tPLH = tPHL = 10 ns. Which gate can be operated at a higher frequency? Explain!

(a) Suppose that the BI/RBO input line was connected to ground on the 74LS47 BCD- to-seven segment decoder and all other input lines were connected as shown in Figure 3. Determine the effect this would have on the display. (b) Assume that the switches in Figure 3 are set to binary 1000, but the display shows a zero. What are possible causes for this error? Four DIP switches +5.0 V 1.0 ΚΩ MSB LSB w 330 Ω www 330 Ω 330 ww 330 Ω +5.0 V 7447A +5.0 V R's=330 Voc Anode a w a Lamp test ba ww b BI/RBO CO www RBI Outputs d w e ww e f w ww 8 DUBA BCD inputs GND MAN72 seven-segment display

3. Sweep Vin (0 to 1V) and plot Id. Vth = 0.4V. Indicate the region of operation clearly. 1V Jid Vin