Figure 71 Two versions of SET-RESET (S-R) latches. Open file
F07-01 and verify the operation of both latches. Thomas L. Floyd
Digital Fundamentals, 9e Copyright 2006 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458 All rights reserved. Slide 2
Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson
Education, Inc. Upper Saddle River, New Jersey 07458 All rights
reserved. Figure 72 Negative-OR equivalent of the NAND gate latch
in Figure 91(b). Slide 3 Figure 73 The three modes of basic latch
operation (SET, RESET, no-change) and the invalid condition. Thomas
L. Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson
Education, Inc. Upper Saddle River, New Jersey 07458 All rights
reserved. Figure 73 The three modes of basic latch operation (SET,
RESET, no-change) and the invalid condition. Slide 4 Figure 74
Logic symbols for the S-R and latch. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 5 Figure
75 Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006 by
Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 6 Thomas L. Floyd Digital Fundamentals, 9e
Figure 76 The latch used to eliminate switch contact bounce.
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 7 Figure 77 The 74LS279
quad latch. Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006
by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 8 Figure 78 A gated S-R latch. Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 9 Figure 79 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 10 Figure 710 A gated D
latch. Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006 by
Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 11 Figure 711 Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 12 Figure
712 The 74LS75 quad gated D latches. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 13 Figure
713 Edge-triggered flip-flop logic symbols (top: positive
edge-triggered; bottom: negative edge-triggered). Thomas L. Floyd
Digital Fundamentals, 9e Copyright 2006 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458 All rights reserved. Slide 14
Figure 714 Operation of a positive edge-triggered S-R flip-flop.
Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson
Education, Inc. Upper Saddle River, New Jersey 07458 All rights
reserved. Slide 15 Figure 715 Thomas L. Floyd Digital Fundamentals,
9e Copyright 2006 by Pearson Education, Inc. Upper Saddle River,
New Jersey 07458 All rights reserved. Slide 16 Figure 716 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 17 Figure 717 Edge triggering. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 18 Figure
718 Flip-flop making a transition from the RESET state to the SET
state on the positive-going edge of the clock pulse. Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 19 Figure 719 Flip-flop making a transition from the SET
state to the RESET state on the positive-going edge of the clock
pulse. Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006 by
Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 20 Figure 720 A positive edge-triggered D
flip-flop formed with an S-R flip-flop and an inverter. Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 21 Figure 721 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 22 Figure 722 A simplified
logic diagram for a positive edge-triggered J-K flip-flop. Thomas
L. Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson
Education, Inc. Upper Saddle River, New Jersey 07458 All rights
reserved. Slide 23 Figure 723 Transitions illustrating the toggle
operation when J = 1 and K = 1. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 24 Figure
724 Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006 by
Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 25 Figure 725 Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 26 Figure
726 Logic symbol for a J-K flip-flop with active-LOW preset and
clear inputs. Thomas L. Floyd Digital Fundamentals, 9e Copyright
2006 by Pearson Education, Inc. Upper Saddle River, New Jersey
07458 All rights reserved. Slide 27 Figure 727 Logic diagram for a
basic J-K flip-flop with active-LOW preset and clear inputs. Thomas
L. Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson
Education, Inc. Upper Saddle River, New Jersey 07458 All rights
reserved. Slide 28 Figure 728 Open file F07-28 to verify the
operation. Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006
by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 29 Figure 729 Logic symbols for the 74AHC74
dual positive edge-triggered D flip-flop. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 30 Figure
730 Logic symbols for the 74HC112 dual negative edge-triggered J-K
flip-flop. Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006
by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 31 Figure 731 Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 32 Figure
732 Propagation delays, clock to output. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 33 Figure
733 Propagation delays, preset input to output and clear input to
output. Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006 by
Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 34 Figure 734 Set-up time (t s ). The logic
level must be present on the D input for a time equal to or greater
than t s before the triggering edge of the clock pulse for reliable
data entry. Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006
by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 35 Figure 735 Hold time (t h ). The logic
level must remain on the D input for a time equal to or greater
than t h after the triggering edge of the clock pulse for reliable
data entry. Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006
by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 36 Figure 736 Example of flip-flops used in
a basic register for parallel data storage. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 37 Figure
737 The J-K flip-flop as a divide-by-2 device. Q is one-half the
frequency of CLK. Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 38 Figure 738 Example of
two J-K flip-flops used to divide the clock frequency by 4. Q A is
one-half and Q B is one-fourth the frequency of CLK. Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 39 Figure 739 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 40 Figure 740 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 41 Figure 741 Flip-flops used to generate a binary count
sequence. Two repetitions (00, 01, 10, 11) are shown. Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 42 Figure 742 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 43 Figure 743 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 44 Figure 744 A simple one-shot circuit. Thomas L. Floyd
Digital Fundamentals, 9e Copyright 2006 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458 All rights reserved. Slide 45
Figure 745 Basic one-shot logic symbols. CX and RX stand for
external components. Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 46 Figure 746
Nonretriggerable one-shot action. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 47 Figure
747 Retriggerable one-shot action. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 48 Figure
748 Logic symbols for the 74121 nonretriggerable one-shot. Thomas
L. Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson
Education, Inc. Upper Saddle River, New Jersey 07458 All rights
reserved. Slide 49 Figure 749 Three ways to set the pulse width of
a 74121. Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006 by
Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 50 Figure 750 Logic symbol for the 74LS122
retriggerable one-shot. Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 51 Figure 751 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 52 Figure 752 A sequential timing circuit using three 74LS122
one-shots. Thomas L. Floyd Digital Fundamentals, 9e Copyright 2006
by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All
rights reserved. Slide 53 Figure 753 Internal functional diagram of
a 555 timer (pin numbers are in parenthesis). Thomas L. Floyd
Digital Fundamentals, 9e Copyright 2006 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458 All rights reserved. Slide 54
Figure 754 The 555 timer connected as a one-shot. Thomas L. Floyd
Digital Fundamentals, 9e Copyright 2006 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458 All rights reserved. Slide 55
Figure 755 One-shot operation of the 555 timer. Thomas L. Floyd
Digital Fundamentals, 9e Copyright 2006 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458 All rights reserved. Slide 56
Figure 756 The 555 timer connected as an astable multivibrator
(oscillator). Thomas L. Floyd Digital Fundamentals, 9e Copyright
2006 by Pearson Education, Inc. Upper Saddle River, New Jersey
07458 All rights reserved. Slide 57 Figure 757 Operation of the 555
timer in the astable mode. Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 58 Figure 758 Frequency of
oscillation as a function of C 1 and R 1 + 2R 2. The sloped lines
are values of R 1 + 2R 2. Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 59 Figure 759 The addition
of diode D 1 allows the duty cycle of the output to be adjusted to
less than 50 percent by making R 1 < R 2. Thomas L. Floyd
Digital Fundamentals, 9e Copyright 2006 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458 All rights reserved. Slide 60
Figure 760 Open file F07-60 to verify operation. Thomas L. Floyd
Digital Fundamentals, 9e Copyright 2006 by Pearson Education, Inc.
Upper Saddle River, New Jersey 07458 All rights reserved. Slide 61
Figure 761 Two-phase clock generator with ideal waveforms. Open
file F07-61 and verify the operation. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 62 Figure
762 Oscilloscope displays for the circuit in Figure 761. Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 63 Figure 763 Two-phase clock generator using negative
edge-triggered flip-flop to eliminate glitches. Open file F07-63
and verify the operation. Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 64 Figure 764 Traffic light
control system block diagram. Thomas L. Floyd Digital Fundamentals,
9e Copyright 2006 by Pearson Education, Inc. Upper Saddle River,
New Jersey 07458 All rights reserved. Slide 65 Figure 765 Block
diagram of the timing circuits. Thomas L. Floyd Digital
Fundamentals, 9e Copyright 2006 by Pearson Education, Inc. Upper
Saddle River, New Jersey 07458 All rights reserved. Slide 66 Figure
766 The timing circuits. Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 67 Figure 767 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 68 Figure 768 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 69 Figure 769 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 70 Figure 770 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 71 Figure 771 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 72 Figure 772 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 73 Figure 773 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 74 Figure 774 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 75 Figure 775 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 76 Figure 776 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 77 Figure 777 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 78 Figure 778 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 79 Figure 779 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 80 Figure 780 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 81 Figure 781 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 82 Figure 782 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 83 Figure 783 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 84 Figure 784 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 85 Figure 785 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 86 Figure 786 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 87 Figure 787 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 88 Figure 788 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 89 Figure 789 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 90 Figure 790 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 91 Figure 791 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 92 Figure 792 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 93 Figure 793 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 94 Figure 794 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 95 Figure 795 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 96 Figure 796 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 97 Figure 797 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 98 Figure 798 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 99 Figure 799 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 100 Figure 7100 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 101 Figure 7101 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
Slide 102 Figure 7102 Thomas L. Floyd Digital Fundamentals, 9e
Copyright 2006 by Pearson Education, Inc. Upper Saddle River, New
Jersey 07458 All rights reserved. Slide 103 Figure 7103 Thomas L.
Floyd Digital Fundamentals, 9e Copyright 2006 by Pearson Education,
Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
