Question: In Figure 8-44, a logic probe indicates that the lower end of the pull-up resistor is stuck in the LOW state. Which of the following

In Figure 8-44, a logic probe indicates that the lower end of the pull-up resistor is stuck in the LOW state. Which of the following is the possible fault?

(a) The TTL gate’s current-sourcing transistor is open.

(b) The TTL gate’s current-sinking transistor has a collector–emitter short.

Figure 8-44

+5 V TTL 10 CMOS

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