Samsung SRP-350U, Service Manual

Page: 49 / 125

6 Reference Information
6-4
6-1 Semiconductor Base Diagram
6-1-3 Logic ICs
74HC574 FUNCTION TABLE
INPUT
/OC C D
OUTPUT Q
L H H H
L H L L
L L X Q0
H X X Z
6-1-4 Other Semiconductor Chip
MAX488 DRIVER MAX488 RECEIVER
OPERATION INPUT
DI
Y Z
DIFFERENTIAL INPUT
A-B
OUTPUT
RO
H
H L V
ID
0.2 V H
L L H -0.2 V < V
ID
< 0.2 V ?
V
ID
-0.2 V L
74HC574
D0
/OE
D1
D3
D2
D4
D6
D5
D7
GND
VCC
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
C
XOUT
XIN
REF_OFF
LF
FS741
RS0
VCC
RS1
VSS
Low EMI Spectrum Spread Clock
RO
VCC
DI
GND
MAX488
B
A
Z
Y
Differential Bus Transceivers
DELAY CATACITOR
OUTPUT
GND
N.C
Voltage Detect System Reset IC
SUPPLY VOLYAGE
M
51953B
74HC74 74HC32 74HC02
Samsung Electro-M
e
chanics