To test the circuit of Figure 9-10, a technician connects a BCD counter to the 74HC4511 inputs and pulses the counter at a very slow rate. She notices that the f segment works erratically, and no particular pattern is evident. What are some of the possible causes of the malfunction?

Figure 9-10

Transcribed Image Text:

40-Hz signal 40 Hz D C B A 5 V . Control | Segment LOW OFF HIGH ON Control 74HC4511 7-segment decoder/ driver a b с BCD-to- d e g (a) (b) 74HC86 All 74HC86 www Segment Backplane d e 9 LCD Backplane