MAX456 Просмотр технического описания (PDF) - Maxim Integrated
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MAX456 Datasheet PDF : 12 Pages
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8 x 8 Video Crosspoint Switch
Table 1. Parallel-Interface Mode Functions
A2-A0
Selects
Output
Buffer,
OUT0
to
OUT7
D3-D0
0000 to 0111
1000
1011
FUNCTION
Connect the buffer selected by A2-A0 to the input channel selected by D3-D0.
Connect the buffer selected by A2-A0 to DGND. Note, if the buffer output is on, its output
is its offset voltage.
Shut off the buffer selected by A2-A0, and retain 2nd-rank contents.
1100
Turn on the buffer selected by A2-A0, or restore the previously connected channel.
1101
Turn off all buffers, or leave 2nd-rank registers unchanged.
1110
1111
1001 and 1010
Turn on all buffers, or restore the previously connected channels.
Send a pulse to the 2nd-rank registers to load them with the contents of the 1st-rank
registers. When latch is held high, this "software-LATCH" command performs the same
function as pulsing LATCH low.
Do not use these codes in the parallel-interface mode. These codes are for the serial-
interface mode only.
Table 2. Serial-Interface Mode Functions
D3-D0
FUNCTION
0000 to 0111
Connect the selected buffer to the input
channel selected by D3-D0.
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.
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