Refer to Figure 8-65(a), where a 74LS TTL output, Q, is driving a CMOS INVERTER operating at
Question:
Refer to Figure 8-65(a), where a 74LS TTL output, Q, is driving a CMOS INVERTER operating at VDD = 10 V. The waveforms at Q and X appear as shown in Figure 8-65(b). Which of the following is a possible reason why X stays HIGH?
(a) The 10-V supply is faulty.
(b) The pull-up resistor is too large.
(c) The 74LS112 output breaks down at well below 10 V and maintains a 5.5-V level in the HIGH state. This is in the indeterminate range for the CMOS input.
(d) The CMOS input is loading down the TTL output.
Figure 8-65
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Related Book For
Digital Systems Principles And Application
ISBN: 9780134220130
12th Edition
Authors: Ronald Tocci, Neal Widmer, Gregory Moss
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