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National Semiconductor Electronic Components Datasheet

LMV7251 Datasheet

1.8V Low Voltage Comparator with Rail-to-Rail Input

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January 2001
LMV7251/LMV7255
1.8V Low Voltage Comparator with Rail-to-Rail Input
General Description
The LMV7251/LMV7255 are rail-to-rail input low voltage
comparators, which can operate at supply voltage range of
1.8V to 5.0V. The LMV7251/LMV7255 are available in space
saving SC-70 or SOT23-5 packages. These comparators
are ideal for low voltage and space critical designs.
The LMV7251 features a push-pull output stage. This feature
allows operation with minimum power consumption when
driving a load.
The LMV7255 features an open drain output. This allows the
connection of an external resistor at the output. The output of
the comparator can be used as a level shifter.
The IC’s are built with National Semiconductor’s advance
Submicron Silicon-Gate BiCMOS process. The
LMV7251/LMV7255 have bipolar inputs for improved noise
performance and CMOS outputs for better rail-to-rail output
performance.
Features
(VS = 1.8V, TA = 25˚C, Typical values unless specified).
n Single or Dual Supplies
n Low supply voltage
1.8V to 5.0V
n Ultra low supply current
11µA
n Low input bias current
14nA
n Low input offset current
200pA
n Low input offset voltage
+/−0.3mV
n Response time
670ns (20mV overdrive)
n Input common mode voltage
0.1V beyond rails
Applications
n Mobile communications
n Laptops and PDA’s
n Battery powered electronics
n General purpose low voltage applications
Typical Circuit
Connection Diagram
DS200057-2
FIGURE 1. Threshold Detector
Top View
DS200057-1
© 2001 National Semiconductor Corporation DS200057
www.national.com


National Semiconductor Electronic Components Datasheet

LMV7251 Datasheet

1.8V Low Voltage Comparator with Rail-to-Rail Input

No Preview Available !

Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance
VIN Differential
Supply Voltage (V+ - V)
Voltage at Input/Output pins
Soldering Information
Infrared or Convection (20
sec.)
1KV (Note 2)
200V (Note 6)
+/−Supply Voltage
5.5V
V+ +0.1V, V−0.1V
235˚C
Wave Soldering (10 sec.)
Storage Temperature Range
Junction Temperature (Note 4)
Operating Ratings (Note 1)
Supply Voltage V+
Junction Temperature Range (Note
3)
Package Thermal Resisance (Note 3)
SOT23-5
SC-70
260˚C
−65˚C to +150˚C
+150˚C
1.8V to 5.0V
−40˚C to +85˚C
325˚C/W
265˚C/W
1.8V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 1.8V, V= 0V. Boldface limits apply at the temperature
extremes.
Symbol
Parameter
Condition
Typ Limits
(Note 4) (Note 5)
Units
VOS Input Offset Voltage
0.3 6 mV
8 max
TC VOS
IB
IOS
IS
Input Offset Average Drift
Input Bias Current
Input Offset Current
Supply Current
VCM = 0.9V (Note 7)
10 uV/C
14 nA
200 pA
11 15
µA
17 max
ISC Output Short Circuit Current
ILEAKAGE Output Leakage Current
Sourcing, VO = 0.9V
(LMV7251 only)
Sinking, VO = 0.9V
VO = 1.8V
(LMV7255 only)
84
11.6 5
300
mA
min
pA
VOH Output Voltage High
IO = 1.5mA
(LMV7251 only)
1.72 1.675
V
min
VOL Output Voltage Low
VCM Input Common Voltage Range
IO = −1.5mA
CMRR > 45 dB
65 125 mV
max
1.9 V
max
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
0 < VCM < 1.8V
V+ = 1.8V to 5V
−0.1
V
min
72 47
dB
min
79 55
dB
min
1.8V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 1.8V, V= 0V, VCM = 0.5V, VO = V+/2. Boldface limits
apply at the temperature extremes.
Symbol
Parameter
Condition
Typ Limits
(Note 5) (Note 6)
Units
tPHL Propagation Delay
(High to Low)
Input Overdrive = 20mV
Load = 50pF//5k
720
ns
Input Overdrive = 50mV
Load = 50pF//5k
380
ns
www.national.com
2


Part Number LMV7251
Description 1.8V Low Voltage Comparator with Rail-to-Rail Input
Maker National Semiconductor
Total Page 11 Pages
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