MAX379 반도체 회로 부품 판매점
(MAX378 / MAX379) Fault-Protected Analog Multiplexers
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 Maxim Integrated Products |
19-1902; Rev 1; 8/94
High-Voltage, Fault-Protected
Analog Multiplexers
www.DataSheet4U.com
_______________General Description
The MAX378 8-channel single-ended (1-of-8) multiplexer
and the MAX379 4-channel differential (2-of-8) multiplexer
use a series N-channel/P-channel/N-channel structure to
provide significant fault protection. If the power supplies to
the MAX378/MAX379 are inadvertently turned off while
input voltages are still applied, all channels in the muxes
are turned off, and only a few nanoamperes of leakage cur-
rent will flow into the inputs. This protects not only the
MAX378/MAX379 and the circuitry they drive, but also the
sensors or signal sources that drive the muxes.
The series N-channel/P-channel/N-channel protection
structure has two significant advantages over the simple
current-limiting protection scheme of the industry’s first-
generation fault-protected muxes. First, the Maxim protec-
tion scheme limits fault currents to nanoamp leakage
values rather than many milliamperes. This prevents dam-
age to sensors or other sensitive signal sources. Second,
the MAX378/MAX379 fault-protected muxes can withstand
a continuous ±60V input, unlike the first generation, which
had a continuous ±35V input limitation imposed by power
dissipation considerations.
All digital inputs have logic thresholds of 0.8V and 2.4V,
ensuring both TTL and CMOS compatibility without requir-
ing pull-up resistors. Break-before-make operation is
guaranteed. Power dissipation is less than 2mW.
________________________Applications
Data Acquisition Systems
Industrial and Process Control Systems
Avionics Test Equipment
Signal Routing Between Systems
____________________________Features
o Fault Input Voltage ±75V with Power Supplies Off
o Fault Input Voltage ±60V with ±15V Power Supplies
o All Switches Off with Power Supplies Off
o On Channel Turns OFF if Overvoltage Occurs on
Input or Output
o Only Nanoamperes of Input Current Under All
Fault Conditions
o No Increase in Supply Currents Due to Fault
Conditions
o Latchup-Proof Construction
o Operates from ±4.5V to ±18V Supplies
o All Digital Inputs are TTL and CMOS Compatible
o Low-Power Monolithic CMOS Design
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX378CPE
0°C to +70°C
16 Plastic DIP
MAX378CWG
0°C to +70°C
24 Wide SO
MAX378CJE
0°C to +70°C
16 CERDIP
MAX378C/D
0°C to +70°C
Dice**
MAX378EPE
-40°C to +85°C
16 Plastic DIP
MAX378EWG
-40°C to +85°C
24 Wide SO
MAX378EJE
-40°C to +85°C
16 CERDIP
MAX378MJE
-55°C to +125°C 16 CERDIP
MAX378MLP
-55°C to +125°C 20 LCC*
Ordering Information continued at end of data sheet.
* Contact factory for availability.
**The substrate may be allowed to float or be tied to V+ (JI CMOS).
__________________________________________________________Pin Configurations
A0 1
EN 2
V- 3
IN1 4
IN2 5
IN3 6
IN4 7
OUT 8
MAX378
16 A1
15 A2
14 GND
13 V+
12 IN5
11 IN6
10 IN7
9 IN8
DIP
Pin Configurations continued at end of data sheet.
TOP VIEW
A0 1
EN 2
V- 3
IN1A 4
IN2A 5
IN3A 6
IN4A 7
OUTA 8
MAX379
DIP
16 A1
15 GND
14 V+
13 IN1B
12 IN2B
11 IN3B
10 IN4B
9 OUTB
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
High-Voltage, Fault-Protected
Analog Multiplexers
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
Voltage between Supply Pins ..............................................+44V
V+ to Ground ...................................................................+22V
V- to Ground......................................................................-22V
Digital Input Overvoltage:
{VEN, VA
V+ ......................................................................+4V
V- ........................................................................-4V
Analog Input with Multiplexer Power On..............................±65V
{ }Recommended V+ .....................................+15V
Power Supplies V- .......................................-15V
Analog Input with Multiplexer Power Off..............................±80V
Continuous Current, IN or OUT...........................................20mA
Peak Current, IN or OUT
(Pulsed at 1ms, 10% duty cycle max) ............................40mA
Power Dissipation (Note 1) (CERDIP) ................................1.28W
Operating Temperature Range:
MAX378/379C .....................................................0°C to +70°C
MAX378/379E ..................................................-40°C to +85°C
MAX378/379M ...............................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Note 1: Derate 12.8mW/°C above TA = +75°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = +15V, V- = -15V; VAH (Logic Level High) = +2.4V, VAL (Logic Level Low) = +0.8V, unless otherwise noted.)
PARAMETER
STATIC
ON Resistance
OFF Input Leakage Current
OFF Output Leakage Current
ON Channel Leakage Current
Analog Signal Range
Differential OFF Output
Leakage Current
SYMBOL
rDS(ON)
IIN(OFF)
IOUT(OFF)
IOUT(ON)
VAN
IDIFF
CONDITIONS
VOUT = ±10V, IIN = 100µA
VAL = 0.8V, VAH = 2.4V
VIN = ±10V, VOUT = ±10V
VEN = 0.8V (Note 6)
VOUT = ±10V, VIN = ±10V
VEN = 0.8V
MAX378
(Note 6)
MAX379
VIN(ALL) = VOUT = ±10V
VAH = VEN = 2.4V MAX378
VAL = 0.8V (Note 5) MAX379
(Note 2)
MAX379 only
(Note 6)
-55°C to +125°C
TEMP
MIN TYP MAX
+25°C
Full
+25°C
Full
+25°C
Full
Full
+25°C
Full
Full
Full
2.0
3.0
-0.5 0.03
-50
-1.0 0.1
-200
-100
-10 0.1
-600
-300
-15
3.0
4.0
0.5
50
1.0
200
100
10
600
300
+15
Full -50
50
0°C to +70°C
and
-40°C to +85°C UNITS
MIN TYP MAX
2.0 3.5
3.0 4.0
-1.0 0.03 1.0
-50 50
-2.0 0.1 2.0
-200
200
-100
100
-20 0.1 20
-600
600
-300
300
-15 +15
kΩ
nA
nA
nA
V
-50 50 nA
FAULT
Output Leakage Current
(with Input Overvoltage)
IOUT(OFF)
VOUT = 0V, VIN = ±60V
(Notes 3, 4)
+25°C
Full
20
10
20
20
nA
µA
Input Leakage Current
(with Overvoltage)
IIN(OFF)
VIN = ±60V, VOUT = ±10V
(Notes 3, 4)
+25°C
25
40 µA
Input Leakage Current
(with Power Supplies Off)
CONTROL
Input Low Threshold
Input High Threshold
Input Leakage Current
(High or Low)
IIN(OFF)
VIN = ±75V, VEN = VOUT = 0V
A0 = A1 = A2 = 0V or 5V
+25°C
VAL (Note 4)
VAH (Note 4)
IA VA = 5V or 0V (Note 5)
Full
Full 2.4
Full -1.0
10
0.8
2.4
1.0 -1.0
20 µA
0.8 V
V
1.0 µA
2 _______________________________________________________________________________________
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MAX379 multiplexer
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