MAX463 Maxim, MAX463 Datasheet - Page 10

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

The MAX463–MAX466 multiplexer architecture provides
an input transistor buffer, ensuring that no input chan-
nels are ever connected together. Select a channel by
changing A0's state (A0 = 0 for channel A, and A0 = 1
for channel B) and pulsing C
Figure 4 shows the logic timing diagram.
When the enable input (E
enables the MAX463–MAX466 amplifier outputs. When E
is driven high, it disables the amplifier outputs. The
Two-Channel, Triple/Quad
RGB Video Switches and Buffers
Figure 3b. Step Response without an Isolation Resistor
Figure 4. Logic Timing Diagram
10
______________________________________________________________________________________
GND
GND
C
A: V
B: V
MAX468 (NO ISOLATION RESISTOR)
LOAD
IN
OUT
LE = V+
, 500mV/div
= 100pF
, 500mV/div
Output Disable (MAX463–MAX466)
OUTPUTS
—
N
–
CS
EN
) is driven to a TTL low state, it
A0
1 s/div
—
S
–
low (see Tables 1a, 1b).
Digital Interface
t
SU
t
PD
t
CS
B
A
t
t
H
SW
—
t
SU
N
–
t
OFF
disabled MAX463/MAX464 outputs exhibit a 250kΩ
typical resistance. Because their internal feedback
resistors are required to produce a gain of two, the
MAX465/MAX466 exhibit a 1kΩ disabled output resis-
tance.
LE determines whether E
independently. When the latch-enable input (LE) is con-
nected to V+, C
input register. If C
are transparent; once C
are latched.
Figure 3c. Step Response with an Isolation Resistor
t
H
GND
GND
HIGH-Z
MAX468 (WITH ISOLATION RESISTOR)
C
A: V
B: V
LOAD
IN
OUT
, 500mV/div
—
= 100pF, R
, 500mV/div
S
–
—
S
becomes the latch control for the E
–
is low, both the E
ISOLATION
—
—
t
ON
N
S
–
–
1 s/div
is latched by C
returns high, both registers
= 12
—
N
–
and A0 registers
—
S
–
or operates
B
A
—
N
–