Tocci ch 9 msi logic circuits

1. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 19/21/2020
Chapter 9
MSI Logic Circuits

2. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 29/21/2020
DECODERS

3. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 39/21/2020
General Decoders

4. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 49/21/2020
1-of-8 Decoder
n Inputs 2n Outputs

5. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 59/21/2020
1-of-8 Enabled Decoder

6. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 69/21/2020
1-of-8 Enabled Decoder

7. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 79/21/2020
1-of-32 Decoder

8. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 89/21/2020
Digital Function Implementation
   
   
, , 1,2,4,7
, , 3,5,6,7
S x y z
C x y z




Full Adder

9. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 99/21/2020
BCD-to-Decimal Decoders

10. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 109/21/2020
BCD-To-Decimal Decoder/Driver
+ Open Collector O/P Stage:
•Sink I <= 80 mA
•VH <= 30 V

11. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 119/21/2020
Decoder Applications

12. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 139/21/2020
BCD-TO-7-SEGMENT
DECODER/DRIVERS

13. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 149/21/2020
BCD-To-7-Segment Decoder/Driver

14. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 159/21/2020
BCD-To-7-Segment Decoder/Driver

15. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 169/21/2020
BCD-To-7-Segment Decoder/Driver

16. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 189/21/2020
LIQUID-CRYSTAL DISPLAYS

17. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 199/21/2020
Liquid Crystal Displays
Segment-Backplane = Capacitor
Activated Segments absorb light
Or a small
light source

18. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 209/21/2020
Liquid Crystal Displays
f > 25 Hz to avoid flickering.

19. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 229/21/2020
Driving an LCD Segment

20. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 239/21/2020
Driving a 7-Segment LCD Display

21. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 259/21/2020
Types of LCD
1. 7-Segment
2. Alphanumeric
3. Graphical, Pixels
4. Color Displays; 3 sub-pixels/pixel
5. Active matrix TFT (Thin Film Transistor) LCD

22. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 269/21/2020
Types of LCD
Thin Film Transistors:
1. Manufactured directly onto one piece of glass.
2. Switch the pixels on and off.
3. Their control lines run in rows and columns between
the pixels
4. The other piece of glass has a uniform coating to form
a backplane.

23. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 279/21/2020
ENCODERS

24. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 289/21/2020
The General Encoder

25. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 299/21/2020
1. Active Low Input
2. Active High Output
3. Only one Active
Input
Logic Circuit of a 8-to-3 Encoder

26. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 309/21/2020
Priority Encoders
Multiple Active Inputs

27. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 319/21/2020
Decimal-to-BCD Priority Encoders
# Pr 

28. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 329/21/2020
Switch Encoder

29. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 339/21/2020
Decimal-to BCD Switch Encoder

30. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 349/21/2020
Key Press
Ring Counter
Initialization
Keyboard Entry
1

31. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 369/21/2020
MULTIPLEXERS

32. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 379/21/2020
Multiplexers
Data Selectors

33. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 399/21/2020
Multiplexers Functional Diagram

34. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 419/21/2020
2-input Multiplexer

35. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 439/21/2020
4-input Multiplexer
Tristate
Buffer

36. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 459/21/2020
8-input Multiplexer
0 71 2 3 4 5 6

37. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 469/21/2020
Combined Multiplexer

38. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 479/21/2020
Quad Two Input Multiplexer
1
0 0 0 0
B3 B2 B1 B0A3 A2 A1 A0
0
A3 A2 A1 A0
1
B3 B2 B1 B0
0

39. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 489/21/2020
MULTIPLEXER
APPLICATIONS

40. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 499/21/2020
Multiplexer Applications
1. Data Routing
2. Parallel-To-Serial Conversion
3. Logic Function Generation

41. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 509/21/2020
Data Routing

42. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 519/21/2020
Parallel to Serial Converter

43. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 529/21/2020
Seven-Step Control Sequencer

44. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 539/21/2020
Seven-Step Control Sequencer

45. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 549/21/2020
Logic Function Generation
𝐼0
𝐼1
𝐼2
𝐼3
𝐼4
𝐼5
𝐼6
𝐼7

46. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 569/21/2020
A B
Logic Function Generation
0
1
n-1
C
0
1
C

47. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 579/21/2020
DEMULTIPLEXERS (DATA
DISTRIBUTORS)

48. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 589/21/2020
General Demultiplexers

49. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 599/21/2020
1-to-8 Demultiplexer
Note: I is the Data Input
Decoder
Enable

50. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 609/21/2020
Decoder-Demultiplexer

51. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 619/21/2020
Clock Demultiplexer

52. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 629/21/2020
Security Monitoring System
Door Open → 1Door Closed → 0

53. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 639/21/2020
Synchronous Data Transmission System
0 0 0 0 0
000
1
01
1
A0
Shift Enabled
11
A1A2A3
1
1
B0C0D0D3
1
1

54. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 649/21/2020
Synchronous Data Transmission System

55. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 659/21/2020
Synchronous Data Transmission System

56. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 669/21/2020
MAGNITUDE COMPARATOR

57. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 679/21/2020
Magnitude Comparator
Less-Significant
Digit

58. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 689/21/2020
Cascading Magnitude Comparator

59. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 699/21/2020
Simple Controller Application
Magnitude comparator used in a digital thermostat

60. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 709/21/2020
CODE CONVERTERS

61. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 739/21/2020
Code Converters
1 × 1010 = 1010
𝑋 × 1010 = 𝑋0𝑋0
𝑋0 × 1010 = 𝑋0𝑋00
𝑌𝑋 × 1010 = 𝑌0 + 𝑋 × 1010 = 𝑌0𝑌00 + 𝑋0𝑋0
𝐷𝐶𝐵𝐴 × 1010 = 𝐷0𝐷0000 + 𝐶0𝐶000 + 𝐵0𝐵00 + 𝐴0𝐴0
𝑋00 × 1010 = 𝑋0𝑋000
𝐷𝐶𝐵𝐴 × 1010 = 𝐴0𝐴0
+ 𝐵0𝐵00
+𝐶0𝐶000
+𝐷0𝐷0000

62. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 749/21/2020
Code Converters
BCD-to-Binary

63. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 769/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 0 0 0 0 0 0 A0
B0 2 0 0 0 0 0 B0 0
C0 4 0 0 0 0 C0 0 0
D0 8 0 0 0 D0 0 0 0
A1 10 0 0 0 A1 0 A1 0
B1 20 0 0 B1 0 B1 0 0
C1 40 0 C1 0 C1 0 0 0
D1 80 D1 0 D1 0 0 0 0

64. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 779/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 A0
B0 2 B0
C0 4 C0
D0 8 D0
A1 10 A1 A1
B1 20 B1 B1
C1 40 C1 C1
D1 80 D1 D1

65. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 789/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 B1 D0 C0 B0 A0
B0 2 A1 B1 A1
C0 4
D0 8
A1 10
B1 20
C1 40 C1 C1
D1 80 D1 D1

66. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 799/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 B1 D0 C0 B0 A0
B0 2 A1 B1 A1
C0 4 Cr S3 S2 S1 S0 A0
D0 8
A1 10
B1 20
C1 40 C1 C1
D1 80 D1 D1

67. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 809/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 B1 D0 C0 B0 A0
B0 2 A1 B1 A1
C0 4 Cr S3 S2 S1 S0 A0
D0 8
A1 10
B1 20
C1 40 C1 C1
D1 80 D1 D1

68. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 819/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 B1 D0 C0 B0 A0
B0 2 A1 B1 A1
C0 4 Cr S3 S2 S1 S0 A0
D0 8
A1 10
B1 20
C1 40 C1 C1
D1 80 D1 D1

69. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 829/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 B1 D0 C0 B0 A0
B0 2 A1 B1 A1
C0 4 Cr S3 S2 S1 S0 A0
D0 8
A1 10
B1 20
C1 40 C1 C1
D1 80 D1 D1

70. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 839/21/2020
BCD to Binary Converter

71. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 849/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 B1 D0 C0 B0 A0
B0 2 A1 B1 A1
C0 4 Cr S4 S3 S2 S1 A0
D0 8
A1 10
B1 20
C1 40 C1 C1
D1 80 D1 D1

72. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 859/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1
B0 2
C0 4 Cr S4 S3 S2 S1 A0
D0 8
A1 10
B1 20
C1 40 C1 C1
D1 80 D1 D1

73. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 869/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1
B0 2
C0 4 Cr S4 S3 S2 S1 A0
D0 8 D1 C1 D1 C1
A1 10
B1 20
C1 40
D1 80

74. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 879/21/2020
Code Converters
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1
B0 2
C0 4 Cr S4 S3 S2 S1 A0
D0 8 D1 C1 D1 C1
A1 10
B1 20
C1 40
D1 80

75. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 889/21/2020
BCD to Binary Converter

76. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 899/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 A0
B0 2 B0
C0 4 C0
D0 8 D0
A1 10 A1 A1
B1 20 B1 B1
C1 40 C1 C1
D1 80 D1 D1

77. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 909/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 A0
B0 2 B0
C0 4 C0
D0 8 D0
A1 10 A1 A1
B1 20 B1 B1
C1 40 C1 C1
D1 80 D1 D1

78. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 919/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 A0
B0 2 B0
C0 4 C0
D0 8 D0
A1 10 A1 A1
B1 20 B1 B1
C1 40 C1 C1
D1 80 D1 D1

79. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 929/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 A0
B0 2 B0
C0 4 C0
D0 8 D0
A1 10 A1 A1
B1 20 B1 B1
C1 40 C1 C1
D1 80 D1 D1

80. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 939/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 C0 B0 A0
B0 2 B1 A1
C0 4
D0 8 D0
A1 10 A1
B1 20 B1
C1 40 C1 C1
D1 80 D1 D1

81. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 949/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 C0 B0 A0
B0 2 B1 A1
C0 4
D0 8 D0
A1 10 A1
B1 20 B1
C1 40 C1 C1
D1 80 D1 D1

82. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 959/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 C0 B0 A0
B0 2 B1 A1
C0 4
D0 8 D0
A1 10 A1
B1 20 B1
C1 40 C1 C1
D1 80 D1 D1

83. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 969/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 D0 C0 B0 A0
B0 2 C1 B1 A1
C0 4
D0 8
A1 10 A1
B1 20 B1
C1 40 C1
D1 80 D1 D1

84. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 979/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 D0 C0 B0 A0
B0 2 C1 B1 A1
C0 4
D0 8
A1 10 A1
B1 20 B1
C1 40 C1
D1 80 D1 D1

85. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 989/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 D0 C0 B0 A0
B0 2 D1 C1 B1 A1
C0 4
D0 8
A1 10 A1
B1 20 B1
C1 40 C1
D1 80 D1

86. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 999/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 D0 C0 B0 A0
B0 2 D1 C1 B1 A1
C0 4 Cr S3 S2 S1 S0
D0 8
A1 10 A1
B1 20 B1
C1 40 C1
D1 80 D1

87. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1009/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 D0 C0 B0 A0
B0 2 D1 C1 B1 A1
C0 4 Cr S3 S2 S1 S0
D0 8
A1 10 A1
B1 20 B1
C1 40 C1
D1 80 D1

88. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1019/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 D0 C0 B0 A0
B0 2 D1 C1 B1 A1
C0 4 Cr S3 S2 S1 S0
D0 8
A1 10 A1
B1 20 B1
C1 40 C1
D1 80 D1

89. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1029/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 D0 C0 B0 A0
B0 2 D1 C1 B1 A1
C0 4 Cr S3 S2 S1 S0
D0 8
A1 10 A1
B1 20 B1
C1 40 C1
D1 80 D1

90. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1039/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 D0 C0 B0 A0
B0 2 D1 C1 B1 A1
C0 4 Cr S3 S2 S1 S0
D0 8
A1 10 A1
B1 20 B1
C1 40 C1
D1 80 D1

91. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1049/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 D0 C0 B0 A0
B0 2 D1 C1 B1 A1
C0 4 Cr S3 S2 S1 S0
D0 8 D1 C1 B1 A1
A1 10
B1 20
C1 40
D1 80

92. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1059/21/2020
Code Converters: a More Elegant Solution
BCD Dec
Wt
Binary Equivalent
Bit b6 b5 b4 b3 b2 b1 b0
A0 1 D0 C0 B0 A0
B0 2 D1 C1 B1 A1
C0 4 Cr S3 S2 S1 S0
D0 8 D1 C1 B1 A1
A1 10
B1 20
C1 40
D1 80

93. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1069/21/2020
DATA BUSING

94. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1079/21/2020
Data Busing

95. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1089/21/2020
TRISTATE REGISTER

96. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1099/21/2020
The Tristate Register
TriState

97. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1109/21/2020
DATA BUS OPERATION

98. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1119/21/2020
Data Bus Operation
Register Data In
and Data Out are
shorted!!!

99. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1129/21/2020
Data Bus Operation
Simplified representation

100. Copyright  Muhammad A M Islam.SBE202B MSI Logic Circuits 1139/21/2020
Data Bus Operation