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LM239DE4 Arkusz danych(PDF) 10 Page - Texas Instruments

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Numer części LM239DE4
Szczegółowy opis  Quad Differential Comparators
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80- A
µ
Current Regulator
80 µA
60 µA
10 µA
VCC
10 µA
OUT
GND
IN+
IN−
Epi-FET
Diodes
Resistors
Transistors
COMPONENT COUNT
1
2
2
30
LM139, LM239, LM339, LM139A
LM239A, LM339A, LM2901, LM2901AV, LM2901V
SLCS006T – OCTOBER 1979 – REVISED JUNE 2015
www.ti.com
8 Detailed Description
8.1 Overview
The LMx39 is a dual comparator with the ability to operate up to 36 V on the supply pin. This standard device
has proven ubiquity and versatility across a wide range of applications. This is due to very wide supply voltages
range (2 V to 36 V), low Iq, and fast response of the device.
This device is Q100 qualified and can operate over a wide temperature range (–40°C to 125°C).
The open-drain output allows the user to configure the output logic low voltage (VOL) and allows the comparator
to be used in AND functionality.
8.2 Functional Block Diagram
Figure 6. Schematic (Each Comparator)
8.3 Feature Description
LMx39 consists of a PNP Darlington pair input, allowing the device to operate with very high gain and fast
response with minimal input bias current. The input Darlington pair creates a limit on the input common-mode
voltage capability, allowing LMx39 to accurately function from ground to (VCC – 1.5 V) differential input. This is
enables much head room for modern day supplies of 3.3 V and 5 V.
The output consists of an open-drain NPN (pulldown or low-side) transistor. The output NPN sinks current when
the positive input voltage is higher than the negative input voltage and the offset voltage. The VOL is resistive
and scales with the output current. See the Specifications section for VOL values with respect to the output
current.
8.4 Device Functional Modes
8.4.1 Voltage Comparison
The LMx39 operates solely as a voltage comparator, comparing the differential voltage between the positive and
negative pins and outputting a logic low or high impedance (logic high with pullup) based on the input differential
polarity.
10
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Copyright © 1979–2015, Texas Instruments Incorporated
Product Folder Links: LM139 LM239 LM339 LM139A LM239A LM339A LM2901 LM2901AV LM2901V


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