LMV7271MF National Semiconductor, LMV7271MF Datasheet - Page 13

• Manufacturer Part Number: LMV7271MF
• Description: IC,VOLT COMPARATOR,SINGLE,TSOP,5PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LMV7271MF

• Rohs Compliant: NO

Typical Applications
UNIVERSAL LOGIC LEVEL SHIFTER
The output of LMV7275 is an unconnected drain of an
NMOS device, which can be pulled up, through a resistor, to
any desired output level within the permitted power supply
range. Hence, the following simple circuit works as a univer-
sal logic level shifter, pulling up the signal to the desired
level.
POSITIVE PEAK DETECTOR
A positive peak detect circuit is basically a comparator oper-
ated in a unity gain follower configuration, with a capacitor as
a load to maintain the highest voltage. A diode is added at
the output to prevent the capacitor from discharging through
the pull-up resistor, and a 1MΩ resistor added in parallel to
the capacitor to provide a high impedance discharge path.
When the input V
comparator follows it, thus charging the capacitor. When it
decreases, the cap discharges through the 1MΩ resistor.
The decay time can be modified by changing the resistor.
The output should be accessed through a follower circuit to
prevent loading.
FIGURE 7. Positive Peak Detector
FIGURE 6. Logic Level Shifter
IN
increases, the inverting input of the
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OR’ING THE OUTPUT
Since the output is an unconnected NMOS drain, many
drains can be tied together, pulled up to V
resistor to provide an output OR’ing function. If any of the
comparator outputs is pulled low the output V
FIGURE 8. OR’ing the Outputs
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O
goes down.
by a single
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