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Maxim Integrated - Signal-Line Circuit Protectors

Numéro de référence MAX366
Description Signal-Line Circuit Protectors
Fabricant Maxim Integrated 
Logo Maxim Integrated 





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MAX366 fiche technique
19-0326; Rev 0; 12/94
Signal-Line Circuit Protectors
_______________General Description
The MAX366 and MAX367 are multiple, two-terminal circuit
protectors. Placed in series with signal lines, each two-ter-
minal device guards sensitive circuit components against
voltages near and beyond the normal supply voltages.
These devices are used at interfaces where sensitive cir-
cuits are connected to the external world and could
encounter damaging voltages (up to 35V beyond the sup-
ply rails) during power-up, power-down, or fault conditions.
The MAX366 contains three independent protectors and
the MAX367 contains eight. They can protect analog sig-
nals using either unipolar (4.5V to 36V) or bipolar (±2.25V
to ±18V) power supplies. Each protector is symmetrical.
Input and output terminals may be freely interchanged.
These devices are voltage-sensitive MOSFET transistor
arrays that are normally on when power is applied and
normally open circuit when power is off. With ±10V sup-
plies, on-resistance is 100max and leakage is less than
1nA at +25°C.
When signal voltages exceed or are within approximately
1.5V of either power-supply voltage (including when
power is off), the two-terminal resistance increases dra-
matically, limiting fault current as well as output voltage to
sensitive circuits. The protected side of the switch main-
tains the correct polarity and clamps approximately 1.5V
below the supply rail. There are no “glitches” or polarity
reversals going into or coming out of a fault condition.
________________________Applications
Process Control Systems Redundant/Backup Systems
Hot-Insertion Boards/Systems ATE Equipment
Data-Acquisition Systems Sensitive Instruments
____________________________Features
o ±40V Overvoltage Protection
o Open Signal Paths with Power Off
100Signal Paths with Power On
o 1nA Max Path Leakage at +25°C
o 44V Maximum Supply Voltage Rating
o Automatic Protection; No Programming or
Controls
______________Ordering Information
PART
TEMP. RANGE
MAX366CPA
0°C to +70°C
MAX366CSA
0°C to +70°C
MAX366C/D
0°C to +70°C
MAX366EPA
-40°C to +85°C
MAX366ESA
-40°C to +85°C
MAX366MJA
-55°C to +125°C
MAX367CPN
0°C to +70°C
MAX367CWN
0°C to +70°C
MAX367C/D
0°C to +70°C
MAX367EPN
-40°C to +85°C
MAX367EWN
-40°C to +85°C
MAX367MJN
-55°C to +125°C
MAX367 available after January 1, 1995.
* Dice are tested at TA = +25°C only.
* Contact factory for availability.
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
18 Plastic DIP
18 Wide SO
Dice*
18 Plastic DIP
18 Wide SO
18 CERDIP**
Pin Configurations appear at end of data sheet.
___________________________________________________Typical Operating Circuit
REMOTE SENSOR
FAULT!
+10V REG.
ELECTRONICS
PROTECTOR
+28V
MAX366
8
V+
1 IN1
OUT1 7
+12V
(SHORT)
(OPEN)
FAULT!
2 IN2
3 IN3
4 V-
OUT2 6
OUT3 5
SENSITIVE
AMPLIFIER
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.

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