MAX463 Maxim, MAX463 Datasheet - Page 11

• Manufacturer Part Number: MAX463
• Description: Two-Channel / Triple/Quad RGB Video Switches and Buffers
• Manufacturer: Maxim

Table 1a. Amplifier and Channel Selection
with LE = V+
When LE is connected to ground, the E
transparent and independent of C
all MAX463–MAX466 devices to be simultaneously shut
down, regardless of the C
LE to ground and connect all E
5a). For the MAX464 and MAX466, LE must be hard-
wired to either V+ or ground (rather than driving LE with
a gate) to prevent crosstalk from the digital inputs to
IN0A.
Figure 5. (a) Simultaneous Shutdown of all MAX463–MAX466, (b) Enable (
C
NOTE: ISOLATION RESISTORS,
—
0
0
0
1
S
–
IF REQUIRED, NOT SHOWN.
E
—
X
0
0
1
N
–
SHUTDOWN
A0
X
X
0
1
______________________________________________________________________________________
Enables amplifier outputs.
Selects channel A.
Enables amplifier outputs.
Selects channel B.
Disables amplifiers. Outputs high-Z.
Latches all input registers.
Changes nothing.
—
S
–
input state. Simply connect
—
N
EN
–
LE
LE
EN
FUNCTION
—
inputs together (Figure
MAX463–
MAX463–
S
MAX466
MAX466
–
(a)
activity. This allows
RGB Video Switches and Buffers
—
N
–
register is
Two-Channel, Triple/Quad
Another option for output disable is to connect LE to V+,
parallel the outputs of several MAX463-MAX466s, and use
E
(Figure 5b).
When the outputs are disabled, the off isolation from
the analog inputs to the amplifier outputs is typically
70dB at 10MHz, all inputs driven with a 4V
wave and a 150Ω load impedance. Figure 6 shows the
test circuits used to measure isolation and crosstalk.
+5V
Table 1b. Amplifier and Channel Selection
with LE = GND
—
+5V
N
–
C
—
0
0
0
0
1
1
S
to individually disable all devices but the one in use
–
–
E
—
EN
EN
AO
CS
AO
CS
LE
LE
N
–
) Register Latched by
E
—
0
0
1
1
0
1
N
MAX463–
–
MAX463–
MAX466
MAX466
(b)
A0
0
1
0
1
X
X
Enables amplifier outputs.
Selects channel A.
Enables amplifier outputs.
Selects channel B.
Disables amplifiers. Outputs high-Z.
A0 register = channel A
Disables amplifiers. Outputs high-Z.
A0 register = channel B
Enables amplifier outputs, latches A0
register, programs outputs to output A
or B, according to the setting of A0 at
C
Disables amplifiers. Outputs high-Z.
—
S
–
's last edge.
–
C
—
S
–
FUNCTION
P-P
sine
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