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PDF MAX378 Data sheet ( Hoja de datos )
| Número de pieza | MAX378 | |
| Descripción | High-Voltage / Fault-Protected Analog Multiplexers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX378 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-1902; Rev 1; 8/94
High-Voltage, Fault-Protected
Analog Multiplexers
_______________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.
1 page  
High-Voltage, Fault-Protected
Analog Multiplexers
MAX358: VAH = 3.0V
ADDRESS
0V DRIVE (VA)
50% 50% OUTPUT
tOPEN
Figure 2. Break-Before-Make Delay (tOPEN)
A2
IN1
IN2
A1 MAX378* IN2-IN7
VA A0
2.4V
IN8
50Ω EN
OUT
GND
1k
*SIMILAR CONNECTION FOR MAX379
+5V
VOUT
12.5pF
MAX378: VAH = 3.0V
ENABLE DRIVE
50%
0V
90%
tON(EN)
OUTPUT
90%
tOFF(EN)
A2 IN1 +10V
A1 MAX378* IN2-IN7
A0
VA EN OUT
GND
50Ω 1k
*SIMILAR CONNECTION FOR MAX379
12.5pF
Figure 3. Enable Delay (tON(EN), tOFF(EN))
+5V +15V
V-
A0
A1
A2
EN MAX378
I IN1
OUT
IN8
±60V
V
V- GND
±10V
ANALOG
-15V
SIGNAL
10k
+5V
or
0V
I
±75V
0V
V-
A0
A1
A2
EN MAX378
IN1 OUT
V- GND
0V
10k
Figure 4. Input Leakage Current (Overvoltage)
Figure 5. Input Leakage Current (with Power Supplies OFF)
_______________________________________________________________________________________ 5
5 Page 
High-Voltage, Fault-Protected
Analog Multiplexers
_Ordering Information (continued)
PART
MAX379CPE
MAX379CWG
MAX379CJE
MAX379C/D
MAX379EPE
MAX379EWG
MAX379EJE
MAX379MJE
MAX379MLP
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE
16 Plastic DIP
24 Wide SO
16 CERDIP
Dice**
16 Plastic DIP
24 Wide SO
16 CERDIP
16 CERDIP
20 LCC*
* Contact factory for availability.
**The substrate may be allowed to float or be tied to V+ (JI CMOS).
_________________Chip Topographies
MAX378
IN8 OUT
IN4
IN7
IN7 IN3
0.229"
(5.816mm)
IN6 IN2
IN5 IN1
V+ V-
GND
A2 A1 A0
0.151"
(3.835mm)
EN
NOTE: Connect substrate to V+ or leave it floating.
MAX379
OUTB OUTA IN4A
IN4B
IN3B
IN2B
IN3A
0.229"
(5.816mm)
IN2A
IN1B
V+
IN1A
V-
GND
A1 A0
0.151"
(3.835mm)
EN
NOTE: Connect substrate to V+ or leave it floating.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX378.PDF ] | |
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