Datasheet

R
2
D
1
C
1
R
1
TO SD
R
OUT
V
OUT
A
0
A
1
A
2
A
1
A
0
SD
LMH6574
0
3
2
1
IN
4:1
LMH6574
4
7
6
5
IN
4:1
SD
R
OUT
A
0
A
1
1
3
5
7
+
-
+
-
8
9
13
12
11
1
3
5
7
11
8
9
13
12
R
F
R
G
R
G
R
F
LMH6574
www.ti.com SNCS103C –NOVEMBER 2004–REVISED SEPTEMBER 2005
MULTIPLEXER EXPANSION
Figure 30 shows an 8:1 MUX using two LMH6574s.
Figure 30. 8:1 MUX USING TWO LMH6574s
Figure 31. Delay Circuit Implementation
If it is important in the end application to make sure that no two inputs are presented to the output at the same
time, an optional delay block can be added, to drive the SHUTDOWN pin of each device. Figure 31 shows one
possible approach to this delay circuit. The delay circuit shown will delay SHUTDOWN's H to L transitions (R
1
and C
1
decay) but won’t delay its L to H transition. R
2
should be kept small compared to R
1
in order to not
reduce the SHUTDOWN voltage and to produce little or no delay to SHUTDOWN.
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