XV-S300BK/XV-S332SL/XV-S402SL/XV-S403SG
26
SECTION 4
Description of major ICs
4.1 74VHC00MTC-X (IC455,IC503) : 2-input nand gate
4.1.1 Pin layout
4.1.2
Truth table
L : High impedance
4.2 74VHC74MTC-X (IC454) : ZIVA Wait
4.2.1 Terminal layout
4.2.2
.Trouth table
4.2.3 Pin function
(TOP VIEW)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
VCC
4A
4B
4Y
3A
3B
3Y
1A
1B
1Y
2A
2B
2Y
GND
A
B
Y
L
L
H
L
H
H
H
L
H
H
H
L
1
2
3
4
5
6
7
CLR1
D1
CK1
PR1
Q1
Q1
GND
14
13
12
11
10
9
8
Vcc
CLR2
D2
CK2
PR2
Q2
Q2
CK1 D1
Q1 Q1
PR1CLR1
CK2
D2
Q2 Q2
PR2CLR2
Input
Output
Function
CLR
PR
D
CK
Q
Q
L
H
L
H
H
H
H
L
L
H
H
H
X
X
X
L
H
X
X
X
X
L
H
H(Note 1)
L
H
Qn
H
L
H(Note 1)
H
L
Qn
Clear
Preset
No change
Pin No.
Symbol
I/O
Description
Pin No.
Symbol
I/O
Description
1
CLR1
I
Direct clear input 1
8
Q2
O
Output
2
D1
I
Data input 1
9
Q2
O
Output
3
CK1
I
Clock pulse input 1
10
PR2
I
Direct preset input 2
4
PR1
I
Direct preset input 1
11
CK2
I
Click pulse input 2
5
Q1
O
Output
12
D2
I
Data input 2
6
Q1
O
Output
13
CLR2
I
Clock clear input 2
7
GND
-
Connect to ground
14
VCC
-
Power supply