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LM239DE4 Scheda tecnica(PDF) 10 Page - Texas Instruments |
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LM239DE4 Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 37 page 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 Submit Documentation Feedback Copyright © 1979–2015, Texas Instruments Incorporated Product Folder Links: LM139 LM239 LM339 LM139A LM239A LM339A LM2901 LM2901AV LM2901V |
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