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74-Series Chips
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Contents
Introduction
History: a computer from the catalogue
Lesson 0. Gates from transistors: for those who start from scratch
0.1. The idea: a transistor is a switch
0.2. Building
0.3. Check
Lesson 0 paste (Cmd+I)
Lesson 1. Logic in packages: 74HC00, 02, 04, 08, 32
1.1. The idea: a chip is a package with gates
1.2. The idea: free inputs go to ground
1.3. The idea: a latch from one chip
1.4. Building
1.5. Check
Lesson 1 paste (Cmd+I)
Lesson 2. Flip-flops in a package: 74HC74 and a frequency divider
2.1. The idea: a flip-flop with set and reset
2.2. The idea: six NANDs inside
2.3. The idea: a divider is a flip-flop that flips
2.4. Building
2.5. Check
Lesson 2 paste (Cmd+I)
Lesson 3. A counter in a package: 74HC390 and a stopwatch
3.1. The idea: ÷2 and ÷5 make ÷10
3.2. The idea: clocking on the fall
3.3. The idea: reset on a one
3.4. Building
3.5. Check
Lesson 3 paste (Cmd+I)
Lesson 4. A decoder in a package: 74HC138 and a running light
4.1. The idea: number → one wire
4.2. The idea: active 0
4.3. The idea: 4 → 16 from two 3 → 8
4.4. Building
4.5. Check
Lesson 4 paste (Cmd+I)
Lesson 5. A shift register: 74HC595 and 8 lamps over three wires
5.1. The idea: bits over one wire
5.2. The idea: a latch shows everything at once
5.3. The idea: the third state
5.4. Building
5.5. Check
Lesson 5 paste (Cmd+I)
Lesson 6. Bus buffers: 74HC244 and 74HC245
6.1. The idea: a bus and the third state
6.2. The idea: a buffer is a double inversion
6.3. The idea: both ways — two 74HC244
6.4. Building
6.5. Check
Lesson 6 paste (Cmd+I)
Lesson 7. An electronic dice
7.1. The idea: a counter to six
7.2. The idea: face number → dots
7.3. The idea: a fair roll
7.4. Building
7.5. Check
Lesson 7 paste (Cmd+I)
Summary
All the parts
Instructions in pictures
Lesson 7 in pictures
← Back to the lesson: Lesson 7. An electronic dice
7
Electronic dice
the finale: a counter to six and seven dots
kh
HB-05
Hz
1×
Q
Q
2×
74HC04
1×
1
74HC08
1×
1
74HC74
2×
2
74HC86
1×
3
74HC32
1×
1
7×
∞
© 2026 Daniil Khanin · khanin.info · HB-05
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CANVAS
1
Delete
0
X0
0
X1
0
X2
0
X3
0
Y0
0
Y1
0
Y2
0
Y3
0
SEL
2
Delete
0
OFF
BUS0
GND
BUS1
GND
BUS2
GND
BUS3
GND
0
DIR
0
KS0
0
KS1
0
KS2
© 2026 Daniil Khanin · khanin.info · HB-05
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CANVAS …
3
Delete
0
KS3
KS0
K0
KS1
K1
KS2
K2
KS3
K3
UA4
GND
UA5
GND
UA6
GND
UA7
GND
4
Delete
UB4
GND
UB5
GND
UB6
GND
UB7
GND
4b
0
BUS
K0
K1
K2
K3
© 2026 Daniil Khanin · khanin.info · HB-05
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CANVAS …
5
Delete
74HC04
1A
SEL
2A
GND
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nSEL
2Y
3Y
4Y
5Y
6Y
74HC32
1A
SEL
1B
OFF
2A
nSEL
2B
OFF
3A
GND
3B
GND
4A
GND
4B
GND
1Y
oeX
2Y
oeY
3Y
4Y
6
Delete
74HC244
1OE
oeX
1A0
X0
1A1
X1
1A2
X2
1A3
X3
2A3
Y3
2A2
Y2
2A1
Y1
2A0
Y0
2OE
oeY
2Y0
BUS0
2Y1
BUS1
2Y2
BUS2
2Y3
BUS3
1Y3
BUS3
1Y2
BUS2
1Y1
BUS1
1Y0
BUS0
74HC245
DIR
DIR
A0
BUS0
A1
BUS1
A2
BUS2
A3
BUS3
A4
UA4
A5
UA5
A6
UA6
A7
UA7
OE
GND
B7
UB7
B6
UB6
B5
UB5
B4
UB4
B3
K3
B2
K2
B1
K1
B0
K0
© 2026 Daniil Khanin · khanin.info · HB-05
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CANVAS …
7
Hz
1×
Q
Q
2×
3×
1Hz
CLK
Roll
Roll
ROLL
Reset
Reset
RST
8
74HC04
1×
1
8×
74HC04
1A
RST
2A
PAR
3A
GND
4A
GND
5A
GND
6A
GND
1Y
nRST
2Y
DC
3Y
4Y
5Y
6Y
9
74HC08
1×
1
10×
74HC08
1A
CLK
1B
ROLL
2A
Q2
2B
Q1N
3A
GND
3B
GND
4A
GND
4B
GND
1Y
SPIN
2Y
DD
3Y
4Y
10
74HC74
1×
2
12×
74HC74
1RD
nRST
1D
Q2N
1CP
SPIN
1SD
VCC
2SD
VCC
2CP
SPIN
2D
Q0
2RD
nRST
1Q
Q0
1QN
Q0N
2QN
Q1N
2Q
Q1
© 2026 Daniil Khanin · khanin.info · HB-05
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CANVAS …
11
74HC74
1×
2
10×
74HC74
1RD
nRST
1D
Q1
1CP
SPIN
1SD
VCC
2SD
VCC
2CP
GND
2D
GND
2RD
VCC
1Q
Q2
1QN
Q2N
2QN
2Q
12
74HC86
1×
3
10×
74HC86
1A
Q0
1B
Q1
2A
X01
2B
Q2
3A
GND
3B
GND
4A
GND
4B
GND
1Y
X01
2Y
PAR
3Y
4Y
13
74HC32
1×
1
9×
74HC32
1A
Q0
1B
Q2
2A
GND
2B
GND
3A
GND
3B
GND
4A
GND
4B
GND
1Y
DA
2Y
3Y
4Y
14
lamps in a 3 × 3 square, like the dots of a dice
15
5×
5×
DC
DA
DA
Q2
Q2
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CANVAS …
16
2×
2×
DD
DD
17
DA
Q2
DD
DC
DD
Q2
DA
↖ ↘ — DA · ↗ ↙ — Q2
← → — DD · • — DC
Reset — 1
hold Roll — let go
© 2026 Daniil Khanin · khanin.info · HB-05
74
← Back to the lesson
Lesson 7. An electronic dice