MAX4456 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX4456 Datasheet PDF : 16 Pages
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Low-Cost 4x4, 8x4, 8x8
Video Crosspoint Switches
Table 2. Serial-Interface Mode Functions
D3–D0
FUNCTION
0000 to 0111
Connect the selected buffer to the input
channel selected by D3–D0. Note that 0100
through 0111 are not valid for the MAX4359.
1000
1001
1010
1011 to 1111
Connect the input of the selected buffer to
GND. Note: If the buffer output remains
on, its input is its offset voltage.
Turn on the selected buffer and connect
its input to GND. Use this code to turn on
buffers after power is applied. The default
power-up state is all buffers disabled.
Shut off the selected buffer at the speci-
fied channel, and erase data stored in the
2nd rank of registers. The 2nd rank now
holds the command word 1010.
Do not use these codes in the serial-inter-
face mode. They inhibit the latching of the
2nd-rank registers, which prevents proper
data loading.
32-Bit Serial-Interface Mode (MAX4456)
In serial mode (SER/PAR = VCC), all first-rank registers
are loaded with data, making it unnecessary to specify
an output address (A2, A1, A0). The input data format
is D3–D0, starting with OUT0 and ending with OUT7 for
32 total bits. Only codes 0000 through 1010 are valid.
Code 1010 disables a buffer, while code 1001 enables
it. After data is shifted into the 32-bit first-rank register, it
is transferred to the second rank by LATCH (Table 2),
which updates the switches.
Table 3. Input/Output Line Configurations
SERIAL /
PARALLEL
D3
D2
D1
D0
H
X
X
Serial
Output
Serial Input
L
H
Parallel
Input
Parallel
Input
Parallel
Input
L
L
X = Don’t care, H = 5V, L = 0V
( ) are for MAX4456 only.
Parallel
Input
Parallel
Input
Parallel
Input
(A2), A1,
A0
X
Output
Buffer
Address
Output
Buffer
Address
COMMENT
Serial Mode
Parallel Mode,
D0–D2 = Control Code
Parallel Mode,
D0–D2 = Input Address
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