JVC TH-V70 Service Manual page 33

Pin No. Symbol
91 LPFO
92 DLON
93 DLCKS
94 SCKO
95 VSSDL
96 SCKI
97 VSSX
98 XO
99 XI
100 VDDX
74LCX373MTC (IC512,IC513) : Octal D-type latch
1. Terminal layout
OE 1
Q0 2
D0 3
D1 4
Q1 5
Q2 6
D2 7
D3 8
Q3 9
GND 10
(TOP VIEW)
3. Block diagram
D0 D1
3 4
D D
Q Q
L L
11
LE
1
OE
2 5
Q0 Q1
I/O
O Low pass filter output for DLL circuit
I DLCKS pin
I "L"
"L"
"H"
"H"
O ASP clock output (Not connect)
- Ground for DLL circuit
I External system clock input
- Ground for crystal oscillator
O Crystal oscillator output
I Crystal oscillator input
- Digital power supply
2. Truth table
20 VCC
OE
19 Q7
18 D7
H
17 D6
L
16 Q6
L
15 Q5
L
14 D5
13 D4
X: Don't care
12 Q4
Z: High impedance
11 LE
Qn: Q outputs are latched at the time when the LE input
D2 D3 D4 D5
7 8 13 14
D D D D
Q Q Q
L L L L
6 9 12
Q2 Q3 Q4
Function
DLON pin
"L"
"H"
"L"
"H"
INPUTS OUTPUT
LE Y
D
X Z
X
L Qn
X
H L
L
H H H
is taken to a low logic level.
D6 D7
17 18
D D
Q Q Q
L L
15 16 19
Q5 Q6 Q7
DLL clock setting
SCKI input (DLL = off)
4th times of XI clock
3rd times of XI clock
6th times of XI clock
TH-V70
1-33