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Part: MAX379M
Category:
Communication
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-> Switches
-> Switches/Multiplexers
Description: 8-Channel, High-Voltage, Fault-protected Multiplexers
Company: Maxim Integrated Products
Datasheet: Download MAX379M datasheet File size : 711 kB
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Datasheet text preview:
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 current 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 firstgeneration fault-protected muxes. First, the Maxim protection scheme limits fault currents to nanoamp leakage values rather than many milliamperes. This prevents damage 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 requiring pull-up resistors. Break-before-make operation is guaranteed. Power dissipation is less than 2mW.
____________________________Features
o o o o o o o o o o Fault Input Voltage ±75V with Power Supplies Off Fault Input Voltage ±60V with ±15V Power Supplies All Switches Off with Power Supplies Off On Channel Turns OFF if Overvoltage Occurs on Input or Output Only Nanoamperes of Input Current Under All Fault Conditions No Increase in Supply Currents Due to Fault Conditions Latchup-Proof Construction Operates from ±4.5V to ±18V Supplies All Digital Inputs are TTL and CMOS Compatible Low-Power Monolithic CMOS Design
MAX378/MAX379
______________Ordering Information
PART MAX378CPE TEMP. RANGE 0°C to +70°C PIN-PACKAGE 16 Plastic DIP
________________________Applications
Data Acquisition Systems Industrial and Process Control Systems Avionics Test Equipment Signal Routing Between Systems
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
TOP VIEW
A0 1 EN 2 V- 3 IN1 4 IN2 5 IN3 6 IN4 7 OUT 8 16 A1 15 A2 14 GND A0 1 EN 2 V- 3 IN1A 4 IN2A 5 IN3A 6 IN4A 7 OUTA 8 16 A1 15 GND 14 V+
MAX378
13 V+ 12 IN5 11 IN6 10 IN7 9 IN8
MAX379
13 IN1B 12 IN2B 11 IN3B 10 IN4B 9 OUTB
DIP Pin Configurations continued at end of data sheet.
DIP
________________________________________________________________ Maxim Integrated Products
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High-Voltage, Fault-Protected Analog Multiplexers MAX378/MAX379
ABSOLUTE MAXIMUM RATINGS
Voltage between Supply Pins ....+44V V+ to Ground ..........+22V V- to Ground....-22V Digital Input Overvoltage: V+ ....+4V VEN, VA 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
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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.) -55°C to +125°C MIN TYP MAX STATIC ON Resistance OFF Input Leakage Current rDS(ON) IIN(OFF) VOUT = ±10V, IIN = 100µA VAL = 0.8V, VAH = 2.4V VIN = ±10V, VOUT = VEN = 0.8V (Note 6) VOUT = ±10V, VIN = VEN = 0.8V (Note 6) ± 10V +25°C Full +25°C Full 10V MAX378 MAX379 +25°C Full Full +25°C Full Full Full Full ± -50 -1.0 -200 -100 -10 -600 -300 -15 -50 0.1 0.1 2.0 3.0 -0.5 0.03 3.0 4.0 0.5 50 1.0 200 100 10 600 300 +15 50 -50 -2.0 -200 -100 -20 -600 -300 -15 -50 0.1 0.1 2.0 3.0 -1.0 0.03 3.5 4.0 1.0 50 2.0 200 100 20 600 300 +15 50 V nA nA nA k nA 0°C to +70°C and -40°C to +85°C MIN TYP MAX
PARAMETER
SYMBOL
CONDITIONS
TEMP
UNITS
OFF Output Leakage Current
IOUT(OFF)
ON Channel Leakage Current Analog Signal Range Differential OFF Output Leakage Current FAULT Output Leakage Current (with Input Overvoltage) Input Leakage Current (with Overvoltage) Input Leakage Current (with Power Supplies Off) CONTROL Input Low Threshold Input High Threshold Input Leakage Current (High or Low) 2
IOUT(ON) VAN IDIFF
VIN(ALL) = VOUT = ±10V VAH = VEN = 2.4V MAX378 VAL = 0.8V (Note 5) MAX379 (Note 2) MAX379 only (Note 6)
IOUT(OFF) IIN(OFF) IIN(OFF)
VOUT = 0V, VIN = ±60V (Notes 3, 4) VIN = ±60V, VOUT = ±10V (Notes 3, 4) VIN = ±75V, VEN = VOUT = 0V A0 = A1 = A2 = 0V or 5V (Note 4) (Note 4) VA = 5V or 0V (Note 5)
+25°C Full +25°C +25°C
20 10 25 10
20 20 40 20
nA µA µA µA
VAL VAH IA
Full Full Full 2.4 -1.0
0.8 2.4 1.0 -1.0
0.8
V V
1.0
µA
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High-Voltage, Fault-Protected Analog Multiplexers
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +15V, V- = -15V; VAH (Logic Level High) = +2.4V, VAL (Logic Level Low) = +0.8V, unless otherwise noted.) -55°C to +125°C MIN TYP MAX DYNAMIC Access Time Break-Before-Make Delay (Figure 2) Enable Delay (ON) Enable Delay (OFF) Settling Time (0.1%) (0.01%) "OFF Isolation" Channel Input Capacitance Channel Output Capacitance Digital Input Capacitance Input to Output Capacitance SUPPLY Positive Supply Current Negative Supply Current Power-Supply Range for Continuous Operation I+ IVOP VEN = 0.8V or 2.4V All VA = 0V or 5V VEN = 0.8V or 2.4V All VA = 0V or 5V (Note 7) +25°C Full +25°C Full +25°C ±4.5 0.1 0.3 0.01 0.02 0.6 0.7 0.1 0.2 ±18 ±4.5 0.2 0.5 0.01 0.02 1.0 1.0 0.1 0.1 ±18 mA mA V tA tON-tOFF tON(EN) tOFF(EN) tSETT OFF(ISO) CIN(OFF) COUT(OFF) CA CDS(OFF) Figure 1 VEN = +5V, VIN = ±10V A0, A1, A2 strobed Figure 3 Figure 3 +25°C +25°C +25°C Full +25°C Full +25°C VEN = 0.8V, RL = 1k, CL = 15pF +25°C V = 7VRMS, f = 100kHz +25°C MAX378 +25°C MAX379 +25°C +25°C 50 1.2 3.5 68 5 25 12 5 0.1 50 300 25 0.5 200 400 750 1000 500 1000 1.2 3.5 68 5 25 12 5 0.1 300 1000 1.0 25 0.5 200 400 1000 1500 1.0 µs ns ns ns µs dB pF pF pF pF 0°C to +70°C and -40°C to +85°C MIN TYP MAX
MAX378/MAX379
PARAMETER
SYMBOL
CONDITIONS
TEMP
UNITS
Note 2: When the analog signal exceeds +13.5V or -12V, the blocking action of Maxim's gate structure goes into operation. Only leakage currents flow and the channel ON resistance rises to infinity. Note 3: The value shown is the steady-state value. The transient leakage is typically 50µA. See Detailed Description. Note 4: Guaranteed by other static parameters. Note 5: Digital input leakage is primarily due to the clamp diodes. Typical leakage is less than 1nA at +25°C. Note 6: Leakage currents not tested at TA = cold temp. Note 7: Electrical characteristics, such as ON Resistance, will change when power supplies other than ±15V are used.
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