LMV7219M7 National Semiconductor, LMV7219M7 Datasheet - Page 8

• Manufacturer Part Number: LMV7219M7
• Description: Voltage Comparator IC
• Manufacturer: National Semiconductor

Specifications of LMV7219M7

• No. Of Comparators: 1
• Response Time: 7ns
• No. Of Pins: 5
• Output Type: Push Pull
• Single Supply Voltage Min (+v): 2.7V
• Operating Voltage Max: 5V
• Operating Voltage Min: 2.7V
• Rail To Rail I/o Type: Rail Rail Outputs
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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Typical Performance Characteristics
25˚C (Continued)
Application Section
LMV7219 is a single supply comparator with internal hyster-
esis, 7ns of propagation delay and only 1.1mA of supply
current.
The LMV7219 has a typical input common mode voltage
range of −0.2V below the ground to 1V below V
differential input stage is a pair of PNP transistors, therefore,
the input bias current flows out of the device. If either of the
input signals falls below the negative common mode limit,
the parasitic PN junction formed by the substrate and the
base of the PNP will turn on, resulting in an increase of input
bias current.
If one of the inputs goes above the positive common mode
limit, the output will still maintain the correct logic level as
long as the other input stays within the common mode range.
However, the propagation delay will increase. When both
inputs are outside the common mode voltage range, current
saturation occurs in the input stage, and the output becomes
unpredictable.
The propagation delay does not increase significantly with
large differential input voltages. However, large differential
voltages greater than the supply voltage should be avoided
to prevent damages to the input stage.
FIGURE 1. Input and Output Waveforms, Non-Inverting Input Varied
Propagation Delay (t
cc
. The
Unless otherwise specified, V
8
The LMV7219 has a push pull output. When the output
switches, there is a direct path between V
causing high output sinking or sourcing current during the
transition. After the transition, the output current decreases
and the supply current settles back to about 1.1mA at 5V,
thus conserving power consumption.
Most high-speed comparators oscillate when the voltage of
one of the inputs is close to or equal to the voltage on the
other input due to noise or undesirable feedback. The
LMV7219 have 7mV of internal hysteresis to counter para-
sitic effects and noise. The hysteresis does not change
significantly with the supply voltages and the common mode
input voltages as reflected in the specification table.
The internal hysteresis creates two trip points, one for the
rising input voltage and one for the falling input voltage. The
difference between the trip points is the hysteresis. With
internal hysteresis, when the comparator’s input voltages
are equal, the hysteresis effectively causes one comparator-
input voltage to move quickly past the other, thus taking the
input out of the region where oscillation occurs. Standard
comparators require hysteresis to be added with external
resistors. The fixed internal hysteresis eliminates these
resistors.
PD +
)
10105417
10105418
S
= 5V, C
L
= 10 pF, T
CC
A
and ground,
=