January 2001
LMV7251/LMV7255
1.8V Low Voltage Comparator with Rail-to-Rail Input
General Description
Features
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.
(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
n Low input bias current
n Low input offset current
n Low input offset voltage
n Response time
11µA
14nA
200pA
The LMV7251 features a push-pull output stage. This feature
allows operation with minimum power consumption when
driving a load.
+/−0.3mV
670ns (20mV overdrive)
0.1V beyond rails
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.
n Input common mode voltage
Applications
n Mobile communications
n Laptops and PDA’s
n Battery powered electronics
n General purpose low voltage applications
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.
Typical Circuit
Connection Diagram
DS200057-1
Top View
DS200057-2
FIGURE 1. Threshold Detector
© 2001 National Semiconductor Corporation
DS200057
www.national.com