MAX4456 Просмотр технического описания (PDF) - Maxim Integrated
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MAX4456 Datasheet PDF : 16 Pages
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Low-Cost 4x4, 8x4, 8x8
Video Crosspoint Switches
Pin Description
PIN
MAX4359
MAX4360
MAX4456
NAME
FUNCTION
SO
SSOP
SSOP
DIP
PLCC
1
2
3, 5
4, 6, 8, 10
1
2
3, 5
4, 6, 8, 10
1
1
2
D1/ Parallel Data Bit D1 when SER/PAR = GND. Serial out-
SER OUT put for cascading multiple parts when SER/PAR = VCC.
2
2
3
D0/SER IN
Parallel Data Bit D0 when SER/PAR = GND. Serial
input when SER/PAR = VCC.
3, 5
3, 4, 6
4, 5, 7
A_ Output Buffer Address Lines
4, 6, 8, 10, 5, 7, 9, 11, 6, 8, 10, 13,
12, 14, 16, 13, 15, 17, 15, 17, 19, IN_ Video Input Lines
18
19
21
Asynchronous Control Line. When LOAD = VCC, all the
7
7
7
8
9
LOAD
400Ω internal active loads are on. When LOAD = GND,
external 400Ω loads must be used. The buffers must
have a resistive load to maintain stability.
Digital Ground. DGND pins must have the same
9
9
9
10, 12
11, 14
DGND potential and be bypassed to AGND. DGND should
be within ±0.3V of AGND.
When this control line is high, the 2nd-rank registers
11
11
11
14
16
EDGE/
LEVEL
are loaded with the rising edge of LATCH. If this con-
trol line is low, the 2nd-rank registers are transparent
when LATCH is low, passing data directly from the
1st-rank registers to the decoders.
—
12–16, 18,
22–26
22–26
—
1, 12, 23,
34
N.C. No connection. Not internally connected.
12
17
17
18
20
SER/PAR
Connect to VCC for serial mode; connect to GND for
parallel mode.
13
19, 30
19, 30
20, 34
22, 38
V-
Negative Supply. All V- pins must be connected to each
other and bypassed to GND separately (Figure 2).
In serial mode, WR (write) shifts data into the input regis-
14
20
20
21
24
WR ter. In parallel mode, WR loads data into the 1st-rank
registers. Data is latched on the rising edge.
If EDGE/LEVEL = VCC, data is loaded from the 1st-
rank registers to the 2nd-rank registers on the rising
edge of LATCH. If EDGE/LEVEL = GND, data is
15
21
21
22
25
LATCH loaded while LATCH = GND. In addition, data is
loaded during the execution of parallel-mode func-
tions 1011 through 1110, or if LATCH = VCC during
the execution of the parallel-mode “software-latch”
command (1111).
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