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MAX379MJE Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX379MJE Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page _______________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 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). High-Voltage, Fault-Protected Analog Multiplexers ________________________________________________________________ Maxim Integrated Products 1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 A1 A2 GND V+ IN1 V- EN A0 TOP VIEW MAX378 IN5 IN6 IN7 IN8 OUT IN4 IN3 IN2 DIP 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 A1 GND V+ IN1B IN1A V- EN A0 MAX379 IN2B IN3B IN4B OUTB OUTA IN4A IN3A IN2A DIP __________________________________________________________Pin Configurations Call toll free 1-800-998-8800 for free samples or literature. 19-1902; Rev 1; 8/94 PART MAX378CPE MAX378CWG MAX378CJE 0°C to +70°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE 16 Plastic DIP 24 Wide SO 16 CERDIP MAX378EPE MAX378EWG -40°C to +85°C -40°C to +85°C 16 Plastic DIP 24 Wide SO MAX378EJE MAX378MJE -55°C to +125°C -40°C to +85°C 16 CERDIP 16 CERDIP MAX378MLP -55°C to +125°C 20 LCC* Pin Configurations continued at end of data sheet. MAX378C/D 0°C to +70°C Dice** |
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