High-Voltage, Single 8-to-1/Dual 4-to-1 Cal Multiplexers

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The MAX4578/MAX4579 are high-voltage, 8-channel CMOS multiplexers. The MAX4578 and dual 4-channel MAX4579 are ideal for precision ADC calibration and system self-monitoring applications. These calibration multiplexers (cal-muxes) have precision resistor-dividers to generate accurate voltage ratios from an input reference voltage. The reference ratios include 15/4096 and 4081/4096 of the external reference voltage, accurate to 15 bits, and 1/2(V+) and 5/8(V+ - V-), accurate to 8 bits. The external reference voltage as well as ground can also be switched to the output. The MAX4578/MAX4579 have enable inputs and address latching. All digital inputs have 0.8V and 2.4V logic thresholds, ensuring both TTL- and CMOS-logic compatibility when using a single +12V or dual ±15V supplies. Protection diodes at all inputs provide >2kV ESD rating.

The MAX4578/MAX4579 operate from a single +4.5V to +36V supply or from dual supplies of ±4.5V to ±20V. On-resistance (350Ω max) is matched between switches to 15Ω max. Each switch can handle Rail-to-Rail analog signals. The off-leakage current is 20pA at TA = +25°C and 1.25nA at TA = +85°C.

The MAX4578/MAX4579 are available in small 20-pin SSOP, SO, and DIP packages.
MAX4579: Functional Diagram MAX4579: Functional Diagram Enlarge+

Key Features

  • On-Chip Gain and Offset Divider Networks Provide 15-Bit Accurate Output Ratios
  • On-Chip V+ to GND and V+ to V- Divider Networks Provide 8-Bit Accurate Output Ratios
  • 350Ω (max) RON
  • 12Ω (max) RON Matching Between Channels
  • 10pC (max) Charge Injection
  • Guaranteed 20pA Off-Leakage Current
  • Rail-to-Rail Signal Handling
  • Small 20-Pin SSOP, SO, DIP Packages


  • Audio-Signal Routing
  • Avionics
  • Data Acquisition
  • Networking
  • Test Equipment

See parametric specs for Switches and Multiplexers (Mid and High Voltage) (299)

Part NumberFunctionsConfig.ChannelsVSUPPLY (Single)
VSUPPLY (Single)
minmaxminmaxmaxmaxmaxmaxSee Notes
MAX4578 Mux8-to-114.5364.5203500.054002203.5203
SOIC (W)/20
$4.05 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 5299 Selecting the Right CMOS Analog Switch
Request Reliability Report for: MAX4578 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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