8 x 8 Video Crosspoint Switch
IN0 IN1 IN2 IN3 IN4 IN5 IN6 IN7
OUTPUT
BUFFERS
A=1
MAX456
8x8
SWITCH
MATRIX
OUT0
400Ω
LOAD
A=1
OUT7
2nd-RANK REGISTERS
LATCH
EDGE/LEVEL
400Ω
SER/PAR
1st-RANK REGISTERS
A0 A1 A2
D2 D3
D0/SER IN D1/SER OUT
WR
CE
CE
V+ V- AGND DGND
Figure 1. MAX456 Functional Diagram
Table 3. Input/Output Line Configurations
SERIAL/
PARALLEL
D3
H
X
D2
D1
X
Serial
Output
L
H
Parallel
Input
Parallel
Input
L
L
Parallel
Input
Parallel
Input
Note : X = Don't Care, H = 5V, L = 0V
D0
A2-A0
Serial Input
X
Parallel
Input
Parallel
Input
Output
Buffer
Address
Output
Buffer
Address
COMMENT
32-Bit Serial Mode
Parallel Mode,
D0-D2 = Control Code
Parallel Mode,
D0-D2 = Input Address
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