LM397 Single General Purpose Voltage Comparator
August 2006
LM397
Single General Purpose Voltage Comparator
General Description
The LM397 is a single voltage comparator with an input
common mode that includes ground. The LM397 is designed
to operate from a single 5V to 30V power supply or a split
power supply. Its low supply current is virtually independent
of the magnitude of the supply voltage.
The LM397 features an open collector output stage. This
allows the connection of an external resistor at the output.
The output can directly interface with TTL, CMOS and other
logic levels, by tying the resistor to different voltage levels
(level translator).
The LM397 is available in space saving 5-Pin SOT23 pack-
age and pin compatible to TI’s TL331, single differential
comparator.
Features
(T
A
= 25˚C. Typical values unless otherwise specified).
n
5-Pin SOT23 package
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Industrial operating range
−40˚C to +85˚C
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Single or dual power supplies
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Wide supply voltage range
5V to 30V
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Low supply current
300µA
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Low input bias current
7nA
±
1nA
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Low input offset current
±
2mV
n
Low input offset voltage
n
Response time
440ns (50mV overdrive)
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Input common mode voltage
0 to V
S
- 1.5V
Applications
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n
n
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A/D converters
Pulse, square wave generators
Peak detector
Industrial applications
Connection Diagram
5-Pin SOT23
Typical Circuit
20022108
Top View
20022109
FIGURE 1. Inverting Comparator with Hysteresis
Ordering Information
Package
5-Pin SOT-23
Part Number
LM397MF
LM397MFX
Package Marking
C397
Transport Media
1k Units Tape and Reel
3k Units Tape and Reel
NSC Drawing
MF05A
© 2006 National Semiconductor Corporation
DS200221
www.national.com
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