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參數(shù)資料
| 型號(hào)： | MAX366CSA |
| 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, PDSO8 |
| 封裝： | 0.150 INCH, SO-8 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 103K |
| 代理商： | MAX366CSA |
M
S ignal-Line Circ uit Protec tors
_______________________________________________________________________________________
7
The current through each protector should never exceed
30mA. Always calculate the power dissipated by all the
protectors in worst-case conditions (maximum voltage
and current through each protector) to ensure the pack-
age dissipation limit is not reached.
With single-supply operation, grounded loads will have
zero voltage (and current) whenever the input voltage is
below approximately 2V. In effect, both the IN and OUT
pins are in fault condition.
A special case arises when power is off: The part is in a
perpetual fault condition but no fault current flows
because all the internal FETs are off.
S ingle-S upply Output Operation
Single-supply operation is a special case. Signals can-
not go to ground, since from 0V to approximately +2V is
a fault condition.
Extremely Low-Current Operation
Figure 3 shows the typical high-impedance transfer
characteristics with a 100M
load. Compared to the
transfer characteristic at 1M
(see Typical Operating
Characteristics), the two knees are closer to the supply
voltages and the slopes of the flat portions of the curve
(fault conditions) are steeper. As the load resistance is
increased even further, the positive and negative knees
increase, and the slopes in fault conditions increase
even more. Eventually, at some extremely high output
resistance (e.g., Tera ohms), the output voltage can
exceed the supply voltage during fault conditions. This
is due to extremely low leakage currents from the input
to output.
When the protector’s output side is connected to very
high-resistance, very low-current loads (such as op-
amp inputs), a small leakage current flows from the
input to the output during fault conditions. This current
is typically below a nano-ampere (<10
-9
A) but, if the
output resistance is high enough, it can cause the out-
put voltage to exceed the supply voltages during fault
conditions.
This condition can be self-correcting, however, if the
high-resistance load has protection diodes to the sup-
ply rails (either external or internal to the op amp).
These diodes conduct the leakage current to the supply
rails and safely limit the output voltage. An alternative is
to add a high-value resistor to ground in parallel with
the load. This resistor may be as low as 1000M
; its
value must be determined experimentally at the highest
anticipated operational temperature.
The fault protectors will not normally be used with high-
impedance FET-input amplifiers that lack input protection
diodes. Such amplifiers are fragile and are normally
reserved for use when ultra-low leakage (pA) is needed.
The MAX366/MAX367 have nano-amperes of leakage,
which would negate the low leakage of the unprotected
amplifier.
Low-V oltage Operation
The MAX366/MAX367 “operate” with supply voltages
all the way down to 0V, but what they do to the signal is
not obvious. With a total supply voltage of 3.5V, the
protector is in a fault condition with nearly any input that
is not close to 2.0V. Below 3.5V (including power off),
the protector is perpetually in a fault condition (i.e., high
impedance).
When the supply voltage(s) ramps up (and/or down)
from zero, the signal path is initially in a fault condition
(open), until the supply voltage passes the input volt-
age. The output starts at zero and is delayed from
reaching the input voltage as the part comes out of the
fault condition. If the supply voltage exceeds about
3.5V, but never exceeds the input voltage, the output
will follow the supply, always remaining about 1.3V
below the positive supply voltage or 2V above the neg-
ative supply voltage. If the input voltage subsequently
comes out of the fault condition, the output returns to
the input value. This set of conditions is exactly
reversed when power ramps down to zero.
Since the input and output pins are identical and inter-
changeable, predicting whether or not the part is in a
fault condition is easy: If either IN or OUT exceeds V+
or V-, a fault condition exists and the current that flows
will be just enough to cause the other signal pin (OUT
or IN) to approach the appropriate supply rail.
0
1
2
3
4
5
-1
-2
-3
-4
-30
30
M
INPUT VOLTAGE (V)
O
0
-20
-10
20
10
V+ = +5V
V- = -5V
R
OUT
= 100M
Figure 3. High-Impedance Transfer Characteristic
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX366CSA+ | 功能描述:隔離器接口集成電路 Signal Line Circuit Protector RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時(shí)間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX366CSA+T | 功能描述:隔離器接口集成電路 Signal Line Circuit Protector RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時(shí)間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX366CSA-T | 功能描述:TVS二極管陣列 RoHS:否 制造商:Littelfuse 極性: 通道:4 Channels 擊穿電壓: 鉗位電壓:11.5 V 工作電壓:2.5 V 峰值浪涌電流:20 A 安裝風(fēng)格:SMD/SMT 端接類型:SMD/SMT 系列: 最小工作溫度:- 40 C 最大工作溫度:+ 85 C |
| MAX366EPA | 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 |
| 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 |
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