Description Of Major Ics; 74Vhc00Mtc-X (Ic455,Ic503) : 2-Input Nand Gate; 74Vhc74Mtc-X (Ic454) : Ziva Wait - JVC XV-S300BK Service Manual

XV-S300BK/XV-S332SL/XV-S402SL/XV-S403SG

4.1 74VHC00MTC-X (IC455,IC503) : 2-input nand gate

4.1.1 Pin layout
1A 1
1B 2
1Y 3
2A 4
2B 5
2Y 6
GND 7
(TOP VIEW)

4.2 74VHC74MTC-X (IC454) : ZIVA Wait

4.2.1 Terminal layout
1
CLR1
2
D1
CK1 D1
3
CK1
PR1CLR1
4
PR1
5
Q1
6
D2
Q1
7 PR2CLR2
GND
Q2 Q2
4.2.3 Pin function
Pin No. Symbol I/O
1 CLR1 I Direct clear input 1
2 D1 I Data input 1
3 CK1 I Clock pulse input 1
4 PR1 I Direct preset input 1
5 Q1 O Output
6 Q1 O Output
7 GND - Connect to ground
26
SECTION 4

Description of major ICs

14 VCC
13 4A
12 4B
11 4Y
10 3A
9 3B
8 3Y
14
Vcc
13
CLR2
12
D2
11
Q1 Q1
CK2
10
PR2
9
CK2
Q2
8
Q2
Description Pin No.
8
9
10
11
12
13
14
4.1.2 Truth table
A B Y
L L H
L H H
H L H
H H L
L : High impedance
4.2.2 .Trouth table
Input
CLR PR D
L H
X
H L X
L L X
H H L
H H H
H H X
Symbol I/O Description
Q2 O Output
Q2 O Output
PR2 I Direct preset input 2
CK2 I Click pulse input 2
D2 I Data input 2
CLR2 I Clock clear input 2
VCC - Power supply
Output
CK Q Q
X L H
X H L
X H(Note 1) H(Note 1)
L H
H L
Qn Qn No change
Function
Clear
Preset