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PDF LM397 Data sheet ( Hoja de datos )
| Número de pieza | LM397 | |
| Descripción | Single General Purpose Voltage Comparator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM397 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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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
(TA = 25˚C. Typical values unless otherwise specified).
n 5-Pin SOT23 package
n Industrial operating range
−40˚C to +85˚C
n Single or dual power supplies
n Wide supply voltage range
5V to 30V
n Low supply current
300µA
n Low input bias current
7nA
n Low input offset current
±1nA
n Low input offset voltage
±2mV
n Response time
440ns (50mV overdrive)
n Input common mode voltage
0 to VS - 1.5V
Applications
n A/D converters
n Pulse, square wave generators
n Peak detector
n Industrial applications
Connection Diagram
5-Pin SOT23
Typical Circuit
www.DataSheet4U.com
Top View
20022108
Ordering Information
Package
5-Pin SOT-23
Part Number
LM397MF
LM397MFX
20022109
FIGURE 1. Inverting Comparator with Hysteresis
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
1 page  
Application Notes (Continued)
Input Stage
The LM397 has a bipolar input stage. The input common
mode voltage range is from 0 to (VS – 1.5V).
Output Stage
The LM397 has an open collector grounded-emitter NPN
output transistor for the output stage. This requires an exter-
nal pull-up resistor connected between the positive supply
voltage and the output. The external pull-up resistor should
be high enough resistance so to avoid excessive power
dissipation. In addition, the pull-up resistor should be low
enough resistance to enable the comparator to switch with
the load circuitry connected. Because it is an open collector
output stage, several comparator outputs can be connected
together to create an OR’ing function output. With an open
collector, the output can be used as a simple SPST switch to
ground.The amount of current which the output can sink is
approximately 10mA. When the maximum current limit is
reached, the output transistor will saturate and the output will
rise rapidly (Figure 4).
20022107
FIGURE 4. Output Saturation Voltage vs. Output Sink
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Current
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LM397.PDF ] | |
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