Datasheet

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LMH6647
LMH664
7
1/5
74HC04
1/5
74HC04
SELECT
INPUT
INPUT A
INPUT B
2k
2k
2k
2k
2.7V
2.7V
SHUTDOWN
SHUTDOWN
R
L
2 V/DIV
2.00 µs/DIV
V
S
= 5V
A
V
= +1
V
IN
= 3.5V
PP
V
OUT
SD
LMH6645, LMH6646, LMH6647
SNOS970C –JUNE 2001–REVISED APRIL 2013 www.ti.com
Figure 50 shows the output waveform.
Figure 50. Output Held Low by Active Pull-Down Circuit
If bipolar transistor power dissipation is not tolerable, the switch could be by a N-channel enhancement mode
MOSFET.
2.7V SINGLE SUPPLY RRIO 2:1 MUX
The schematic show in Figure 51 will function as a 2:1 MUX operating on a single 2.7V power supply, by utilizing
the shutdown feature of the LMH6647:
Figure 51. 2:1 MUX Operating off a 2.7V Single Supply
Figure 52 shows the MUX output when selecting between a 1MHz sine and a 250KHz triangular waveform.
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