IC BLOCK DIAGRAM AND TERMINAL DESCRIPTIONS-2
Q212,213: LA7956 (Video switch)
BLOCK DIAGRAM
TRUTH TABLE
S2
(Pin 2)
H
L
H
L
6dB
amp
driver
control
1
2
3
4
5
VIDEO
A
B
VINI
GND
OUT
S3
Vin1
Vin2
Vin3
(Pin 3)
(Pin 4)
(Pin 6)
(Pin 8)
H
ON
OFF
OFF
H
OFF
ON
OFF
L
OFF
OFF
ON
L
OFF
OFF
OFF
video switch
(4input 1output)
6
7
8
9
VIN2
VCC
VIN3
VIN4
Vin4
(Pin 9)
OFF
OFF
OFF
ON
TX-SR502/E/8250/HT-R520