19-0326; Rev 0; 12/94
S ig n a l-Lin e Circ u it P ro t e c t o rs
/MAX367
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
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.
♦ ±40V Overvoltage Protection
♦ Open Signal Paths with Power Off
100Ω Signal Paths with Power On
♦ 1nA Max Path Leakage at +25°C
♦ 44V Maximum Supply Voltage Rating
♦ Automatic Protection; No Programming or
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.
Controls
______________Ord e rin g In fo rm a t io n
†
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX366CPA
MAX366CSA
MAX366C/D
MAX366EPA
MAX366ESA
MAX366MJA
MAX367CPN
MAX367CWN
MAX367C/D
MAX367EPN
MAX367EWN
MAX367MJN
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 100Ω max and leakage is less than
1nA at +25°C.
0°C to +70°C
0°C to +70°C
Dice*
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0°C to +70°C
8 Plastic DIP
8 SO
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.
8 CERDIP**
18 Plastic DIP
18 Wide SO
Dice*
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
18 Plastic DIP
18 Wide SO
18 CERDIP**
†
________________________Ap p lic a t io n s
MAX367 available after January 1, 1995.
* Dice are tested at T = +25°C only.
A
* Contact factory for availability.
Process Control Systems
Hot-Insertion Boards/Systems ATE Equipment
Data-Acquisition Systems Sensitive Instruments
Redundant/Backup Systems
Pin Configurations appear at end of data sheet.
___________________________________________________Typ ic a l Op e ra t in g Circ u it
ELECTRONICS
PROTECTOR
FAULT!
REMOTE SENSOR
8
MAX366
+28V
+12V
V+
+10V REG.
1
IN1
OUT1
7
6
5
(SHORT)
SENSITIVE
AMPLIFIER
2
IN2
IN3
V-
OUT2
OUT3
3
4
(OPEN)
FAULT!
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .
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