LM903N National Semiconductor, LM903N Datasheet

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LM903N

Manufacturer Part Number
LM903N
Description
IC FLUID LEVEL DETECTOR
Manufacturer
National Semiconductor
Type
Fluid or Powderr
Datasheet

Specifications of LM903N

Input Type
Logic
Current - Supply
50mA
Mounting Type
Through Hole
Package / Case
*
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Output Type
-
Interface
-
Other names
*LM903N
LM903
C 1995 National Semiconductor Corporation
Connection Diagram
LM903 Fluid Level Detector
General Description
The LM903 uses the thermal-resistive probe technique to
measure the level of nonflammable fluids A low fluid level is
indicated by a warning lamp operating in continuous or
flashing mode All supervisory requirements to control the
thermal-resistive probe including short and open circuit
probe detection are incorporated within the device The cir-
cuit has possible applications in the detection of hydraulic
fluid oil level etc and may be used with partially conduct-
ing fluids
TL H 5699
See NS Package Number N16E
Order Number LM903N
Dual-In-Line Package
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Flashing or continuous warning indication
Warning threshold externally adjustable
Control circuitry for thermal-resistive probe
Switch on reset and delay to avoid transients
600 mA flashing lamp drive capability
Short and open circuit probe detection
70V transient protection on supply and control input
7V– 18V supply range
Internally regulated supply
b
40 C to
a
80 C operation
TL H 5699 – 1
RRD-B30M115 Printed in U S A
February 1995

Related parts for LM903N

LM903N Summary of contents

Page 1

... Y Short and open circuit probe detection Y 70V transient protection on supply and control input Y 7V– 18V supply range Y Internally regulated supply operation Dual-In-Line Package Order Number LM903N See NS Package Number N16E February 1995 TL H 5699 – 1 RRD-B30M115 Printed ...

Page 2

... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage V CC Control Input Voltage (Pin 7) Transient Voltage (Pins (Note 1) Output Current (Pin 4) I (Sink) 4 Electrical Characteristics V 12V Symbol ...

Page 3

Electrical Characteristics (Continued) V 12V Symbol Parameter Conditions V Auxiliary Output Lamp OFF 14 Voltage Lamp ON V Alarm Level (Difference Between First 1 and Second ...

Page 4

Circuit Timing Diagram Circuit Operation A measurement is initiated when the supply is applied pro- vided the control input pin 7 is low Once a measurement is commenced pin 7 is latched low and the ramp capacitor on pin 12 ...

Page 5

Equivalent Schematic Diagram 5 ...

Page 6

Application Hints INTERNAL COMBUSTION ENGINE OIL LEVEL The basic system provides a single shot measurement when the supply is applied and has a primary application in automotive oil hydraulic fluid and coolant monitoring Partic- ularly in the case of the ...

Page 7

7 ...

Page 8

... National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Molded Dual-in-Line Package (N) Order Number LM903N NS Package N16E 2 A critical component is any component of a life ...

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