MAX4359-MAX4456 Maxim, MAX4359-MAX4456 Datasheet - Page 8

• Manufacturer Part Number: MAX4359-MAX4456
• Description: Low-Cost 4x4 / 8x4 / 8x8 Video Crosspoint Switches
• Manufacturer: Maxim

Low-Cost 4x4, 8x4, 8x8
Video Crosspoint Switches
Table 2. Serial-Interface Mode Functions
Table 3. Input/Output Line Configurations
X = Don’t care, H = 5V, L = 0V
( ) are for MAX4456 only.
8
0000 to 0111
1011 to 1111
PARALLEL
_______________________________________________________________________________________
SERIAL /
D3–D0
1000
1001
1010
H
L
L
Connect the selected buffer to the input
channel selected by D3–D0. Note that 0100
through 0111 are not valid for the MAX4359.
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.
D3
H
X
L
FUNCTION
Parallel
Parallel
Input
Input
D2
X
Parallel
Parallel
Output
Serial
Input
Input
D1
Serial Input
Parallel
Parallel
Input
Input
D0
In serial mode (SER/PAR = V
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.
32-Bit Serial-Interface Mode (MAX4456)
(A2), A1,
Address
Address
Output
Output
Buffer
Buffer
A0
X
Serial Mode
Parallel Mode,
D0–D2 = Control Code
Parallel Mode,
D0–D2 = Input Address
CC
COMMENT
), all first-rank registers