MAX378:8-Channel, High-Voltage, Fault-Protected Multiplexers

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 first-generation 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.

Key Features
  • 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: Pin Configuration
MAX378, MAX379: Pin Configuration
Applications/Uses
  • Avionics Test Equipment
  • Data Acquisition
  • Industrial and Process Control Systems
  • Signal Routing Between Systems
DataSheet
titleDownload file
MAX378-MAX379 Data SheetMAX378-MAX379.pdf
Parametrics
Part NumberFunctionsConfig.ChannelsVSUPPLY (Dual)
(±V)
VSUPPLY (Dual)
(±V)
RON
(Ω)
IL(OFF)
(nA)
tON
(ns)
tOFF
(ns)
CON
(pF)
COFF
(pF)
Package/PinsBudgetary
Price
minmaxmaxmaxminmaxSee Notes
MAX378Mux8-to-114.518350021000500255CDIP(N)/16
LCC/20
PDIP(N)/16
SOIC(W)/24
$7.12 @1k
MAX3794-to-1212CDIP(N)/16
LCC/20
PDIP(N)/16
SOIC(W)/24
$3.65 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX378C/DNo Longer AvailableDICE SALES,;NA pin;DICE S;0°C to +70°CSee data sheet
MAX378CJENo Longer AvailableCDIP(N),;16 pin;173.5 mm²0°C to +70°CNo
MAX378CPENo Longer AvailableMAX378CPE+PDIP(N),;16 pin;160.5 mm²0°C to +70°CNo
MAX378CPE+ActivePDIP(N),;16 pin;160.5 mm²0°C to +70°CLead Free
MAX378CWGNo Longer AvailableMAX378CWG+SOIC(W),;24 pin;166.1 mm²0°C to +70°CNo
MAX378CWG+ActiveSOIC(W),;24 pin;166.1 mm²0°C to +70°CLead Free
MAX378CWG+TActiveSOIC(W),;24 pin;166.1 mm²0°C to +70°CLead Free
MAX378CWG-TNo Longer AvailableMAX378CWG+TW.SO;24 pin0°C to +70°CSee data sheet
MAX378EJENo Longer AvailableCDIP(N),;16 pin;173.5 mm²-40°C to +85°CNo
MAX378EPENo Longer AvailableMAX378EPE+PDIP(N),;16 pin;160.5 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX378EPE+ActivePDIP(N),;16 pin;160.5 mm²-40°C to +85°CLead Free
MAX378EWGNo Longer AvailableMAX378EWG+SOIC(W),;24 pin;166.1 mm²-40°C to +85°CNo
MAX378EWG+ActiveSOIC(W),;24 pin;166.1 mm²-40°C to +85°CLead Free
MAX378EWG+TActiveSOIC(W),;24 pin;166.1 mm²-40°C to +85°CLead Free
MAX378EWG-TNo Longer AvailableMAX378EWG+TW.SO;24 pin-40°C to +85°CSee data sheet
MAX378MJENo Longer AvailableCDIP(N),;16 pin;173.5 mm²-55°C to +125°CNo
MAX378MJE/883BActiveCDIP(N),;16 pin;173.5 mm²-55°C to +125°CNo
MAX378MLPActiveLCC,;20 pin;82.6 mm²-55°C to +125°CNo
MAX378MLP/883BActiveLCC,;20 pin;82.6 mm²-55°C to +125°CNo
MAX378-MAX379.pdf MAX379
MAX378.pdf MAX378
MAX378-MAX379.pdf MAX379