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Part: LM397MFX
Category:
Analog & Mixed-Signal Processing
-> Comparators
-> General Purpose
Description: LM397 - Single General Purpose Voltage Comparator, Package: SOT-23, Pin Nb=5
Company: National Semiconductor Corporation
Datasheet: Download LM397MFX datasheet File size : 4 kB
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LM397 Single General Purpose Voltage Comparator
June 2001
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 SOT23-5 package and pin compatible to TI's TL331, single differential comparator.
Features
(TA = 25°C. Typical values unless otherwise specified). n SOT23-5 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 ± 1nA n Low input offset current ± 2mV n Low input offset voltage n Response time 440ns (50mV overdrive) n Input common mode voltage 0 to VS - 1.5V
Applications
n n n n A/D converters Pulse, square wave generators Peak detector Industrial applications
Connection Diagram
SOT23-5
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
© 2001 National Semiconductor Corporation
DS200221
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LM397
Absolute Maximum Ratings
(Note 1)
Junction Temperature (Note 4) Soldering Information Infrared or Convection (20 sec.) Wave Soldering (10 sec.)
+150°C 235°C 260°C
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance Human Body Model Machine Model VIN Differential Supply Voltages Voltage at Input Pins Storage Temperature Range 2KV (Note 2) 200V (Note 3) 30V 30V or ± 15V -0.3V to 30V -65°C to +150°C
Operating Ratings (Note 1)
Supply Voltage, VS Junction Temperature Range (Note 4) Package Thermal Resistance (Note 4) SOT23-5 168°C/W 5V to 30V -40°C to +85°C
Electrical Characteristics
face limits apply at temperature extremes. Symbol VOS IOS IB IS IO ILEAKAGE VOL VCM Parameter Input Offset Voltage Input Offset Current Input Bias Current Supply Current Output Sink Current Output Leakage Current Output Voltage Low Common-Mode Input Voltage Range
Unless otherwise specified, all limits guaranteed for at TJ = 25°C, VS = 5V. Bold-
Conditions VS = 5V to 30V, VO = 1.4V, VCM = 0V VO = 1.4V, VCM = 0V VO = 1.4V, VCM = 0V RL = Open, VS = 5V RL = Open, VS = 30V VIN+ = 1V,VIN- = 0V, VO = 1.5V VIN+ = 1V,VIN- = 0V, VO = 5V VIN+ = 1V,VIN- = 0V, VO = 30V IO = -4mA, VIN+ = 0V,VIN- = 1V VS = 5V to 30V (Note 7)
Min (Note 6)
Typ (Note 5) 2 1.6 10 0.25 0.30
Max (Note 6) 7 10 50 250 250 400 0.7 2
Units mV nA nA
mA mA nA µA
6
13 0.1 1 180 400 700 0 0
mV
VS - 1.5V V S - 2V
V
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LM397
Electrical Characteristics
Symbol AV tPHL Parameter Voltage Gain
Unless otherwise specified, all limits guaranteed for at TJ = 25°C, VS = 5V. Boldface limits apply at temperature extremes. (Continued) Conditions VS = 15V, VO = 1.4V to 11.4V, RL > = 15k connected to VS Input Overdrive = 5mV RL = 5.1k connected to 5V, CL = 15pF Input Overdrive = 50mV RL = 5.1k connected to 5V, CL = 15pF Min (Note 6) Typ (Note 5) 120 900 Max (Note 6) Units V/mV
Propagation Delay (High to Low)
250
ns
tPLH
Propagation Delay (Low to High)
Input Overdrive = 5mV RL = 5.1k connected to 5V, CL = 15pF Input Overdrive = 50mV RL = 5.1k connected to 5V, CL = 15pF
940
µs
440
ns
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics. Note 2: Human body model, 1.5k in series with 100pF. Note 3: Machine model, 0 in series with 200pF. Note 4: The maximum power dissipation is a function of TJ(MAX), JA , and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) - TA)/ JA . All numbers apply for packages soldered directly onto a PC board. Note 5: Typical values represent the most likely parametric norm. Note 6: All limits are guaranteed by testing or statistical analysis. Note 7: The input common-mode voltage of either input should not be permitted to go below the negative rail by more than 0.3V. The upper end of the common-mode voltage range is VS - 1.5V at 25°C.
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