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參數(shù)資料
| 型號： | 5962-87739012A |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 比較器 |
| 英文描述： | QUAD COMPARATOR, 2000 uV OFFSET-MAX, 5000 ns RESPONSE TIME, CQCC14 |
| 封裝： | LCC-14 |
| 文件頁數(shù)： | 4/26頁 |
| 文件大?。?/td> | 459K |
| 代理商： | 5962-87739012A |
Application Hints
The LM139 series are high gain, wide bandwidth devices
which, like most comparators, can easily oscillate if the output
lead is inadvertently allowed to capacitively couple to the in-
puts via stray capacitance. This shows up only during the
output voltage transition intervals as the comparator changes
states. Power supply bypassing is not required to solve this
problem. Standard PC board layout is helpful as it reduces
stray input-output coupling. Reducing this input resistors to <
10 k
Ω reduces the feedback signal levels and finally, adding
even a small amount (1 to 10 mV) of positive feedback (hys-
teresis) causes such a rapid transition that oscillations due to
stray feedback are not possible. Simply socketing the IC and
attaching resistors to the pins will cause input-output oscilla-
tions during the small transition intervals unless hysteresis is
used. If the input signal is a pulse waveform, with relatively
fast rise and fall times, hysteresis is not required.
All pins of any unused comparators should be tied to the neg-
ative supply.
The bias network of the LM139 series establishes a drain
current which is independent of the magnitude of the power
supply voltage over the range of from 2 V
DC to 30 VDC.
It is usually unnecessary to use a bypass capacitor across the
power supply line.
The differential input voltage may be larger than V+ without
damaging the device. Protection should be provided to pre-
vent the input voltages from going negative more than 0.3
V
DC (at 25°C). An input clamp diode can be used as shown
in the applications section.
The output of the LM139 series is the uncommitted collector
of a grounded-emitter NPN output transistor. Many collectors
can be tied together to provide an output OR'ing function. An
output pull-up resistor can be connected to any available
power supply voltage within the permitted supply voltage
range and there is no restriction on this voltage due to the
magnitude of the voltage which is applied to the V+ terminal
of the LM139A package. The output can also be used as a
simple SPST switch to ground (when a pull-up resistor is not
used). The amount of current which the output device can sink
is limited by the drive available (which is independent of V+)
and the
β of this device. When the maximum current limit is
reached (approximately 16 mA), the output transistor will
come out of saturation and the output voltage will rise very
rapidly. The output saturation voltage is limited by the ap-
proximately 60
Ω R
SAT of the output transistor. The low offset
voltage of the output transistor (1 mV) allows the output to
clamp essentially to ground level for small load currents.
Typical Applications
(V+ = 5.0 V
DC)
Basic Comparator
20122103
Driving CMOS
20122104
Driving TTL
20122105
AND Gate
20122108
OR Gate
20122109
www.national.com
12
LM139A/LM139QML
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| 5962L9673801VCA | QUAD COMPARATOR, 2500 uV OFFSET-MAX, 5000 ns RESPONSE TIME, CDIP14 |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 59628773901CA | 制造商:SIG 功能描述:LM139A/BCA |
| 5962-8773901CA | 制造商:Texas Instruments 功能描述:Comparator Quad ±15V/30V 14-Pin CDIP Tube 制造商:Rochester Electronics LLC 功能描述:QUAD COMPARATOR IC - Bulk 制造商:Texas Instruments 功能描述:COMPARATOR QUAD 15V/30V 14CDIP - Rail/Tube |
| 5962-8773901DA | 功能描述:校驗器 IC RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| 5962-8773901V2A | 制造商:Analog Devices 功能描述:- Rail/Tube |
| 5962-8773901VDA | 制造商:Analog Devices 功能描述:AEROSPACE QUAD LOW-POWER VOLTAGE COMPARATOR - Trays |
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