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參數(shù)資料
| 型號(hào)： | MAX366EPA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Signal-Line Circuit Protectors |
| 中文描述： | TRIPLE 1-CHANNEL, SGL POLE SGL THROW SWITCH, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 103K |
| 代理商： | MAX366EPA |
M
S ignal-Line Circ uit Protec tors
8
_______________________________________________________________________________________
Bipolar Faults
The MAX366/MAX367 V+ and V- pins are normally con-
nected to a circuit’s most positive and most negative
power supplies. When a circuit has multiple power
supplies (such as ±5V and ±12V) and the MAX366/
MAX367 V+ and V- pins are connected to the lower
supply, it is possible to have fault conditions on both
sides of the signal path at once, if both sides of the
switch have paths to higher voltages. If the polarity of
these faults is the same, the signal path will be open
and there is no conflict.
If the IN and OUT pins are driven in opposite polarities
from low-impedance sources, the lower of the two
impedances will overcome the higher impedance, just
as if the protector were not present. (Make sure the
current does not exceed the 30mA absolute maximum
rating.) As the lower impedance source approaches
and exceeds the fault knee voltage, the protector will
conduct enough current to maintain the other signal pin
near the fault knee voltage. This means when the fault
knee voltage is reached, the current through the pro-
tector shifts from the higher current capability of the
lower impedance source to the lower current capability
of the higher impedance source.
_______________Typic al Applic ations
Driven S witc hes
The MAX366/MAX367 have low supply currents
(<1μA), which allows the supply pins to be driven
directly by other active circuitry, instead of connected
directly to the power sources. In this configuration,
the parts can be used as driven fault-protected
switches with V+ or V- pins used as the control pins.
For example, if the V- pin is grounded, you can turn
the V+ pin on and off by driving it with the output of a
CMOS gate. This effectively connects and discon-
nects three or eight separate signal lines at once. (If
bipolar signals or signals that go to ground are being
switched, the V- pin must be driven simultaneously to
a negative potential.) Always ensure that the driving
source(s) does not drive the V+ pin more negative
than the V- pin.
Figure 4 shows a simple turn-on delay that takes
advantage of the MAX366’s low power consumption.
The two RC networks cause gradual application of
power to the MAX366, which in turn applies the input
signals smoothly after the amplifier has stabilized.
The two diodes discharge the two capacitors rapidly
when power is turned off.
This circuit can be tailored to nearly any rate of turn-
on by selecting the RC time constants in the V+ and
V- pins, without affecting the time constant of the
measuring circuit.
Protec tors as Circ uit Elements
Any of the individual protectors in a MAX366 or MAX367
may be used as a switched resistor, independent of the
functions of other elements in the same package. For
example, Figure 5 shows a MAX366 with two of the pro-
tectors used to protect the input of an op amp, and the
third element used to sequence a power supply.
Combining the circuits of Figures 4 and 5 produces a
delayed action on the switched +5V, as well as smooth
application of signals to the amplifier input.
_________Testing Circ uit Protec tors
Measuring Path Resistanc e
Measuring path resistance requires special techniques,
since path resistance varies dramatically with the IN
and OUT voltages relative to the supply voltages.
Conventional ohmmeters should not be used, for two
reasons: 1) the applied voltage and currents are usual-
ly not predictable, and 2) the true resistance is a func-
tion of the applied voltage, which is dramatically altered
by the ohmmeter itself. Autoranging ohmmeters are
particularly unreliable.
MAX366
OUT1
1
10
μ
F
10
μ
F
IN1
7
+5V
-5V
OP AMP
OUT2
2
IN2
6
OUT3
3
IN3
5
V+
4
V-
8
100k
100k
Figure 4. Turn-On Delay
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX366EPA+ | 功能描述:熱插拔功率分布 Signal Line Circuit Protector RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX366ESA | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX366ESA+ | 功能描述:熱插拔功率分布 Signal Line Circuit Protector RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX366ESA+T | 功能描述:熱插拔功率分布 Signal Line Circuit Protector RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX366ESA-T | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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