Features and Benefits

  • Six (MAX6870) or Four (MAX6871) Configurable Input Voltage Detectors
    • One High Voltage Input (+1.25V to +7.625V or +2.5V to +13.2V Thresholds)
    • One Bipolar Voltage Input (±1.25V to ±7.625V or ±2.5V to ±15.25V Thresholds)
    • Four (MAX6870) or Two (MAX6871) Positive Voltage Inputs (+0.5V to +3.05V or +1V to +5.5V Thresholds)
  • Four General-Purpose Logic Inputs
  • Two Configurable Watchdog Timers
  • Eight (MAX6870) or Five (MAX6871) Programmable Outputs
    • Active-High, Active-Low, Open-Drain, Weak Pullup, Push-Pull, Charge-Pump
    • Timing Delays from 25µs to 1600ms
  • 10-Bit Internal ADC Monitors the Input Voltage Detectors and Two Auxiliary Inputs
  • Margining Disable and Manual Reset Controls
  • Internal 1.25V Reference or External Reference Input
  • 4kb Internal User EEPROM
    • Endurance: 100,000 Erase/Write Cycles
    • Data Retention: 10 Years
  • I²C/SMBus-Compatible Serial Configuration/Communication Interface
  • ±1% Threshold Accuracy

Product Details

The MAX6870/MAX6871 EEPROM-configurable, multivoltage supply sequencers/supervisors monitor several voltage detector inputs, two auxiliary inputs, and four general-purpose logic inputs. The MAX6870/MAX6871 feature programmable outputs for highly configurable power-supply sequencing applications. The MAX6870 features six voltage detector inputs and eight programmable outputs, while the MAX6871 features four voltage detector inputs and five programmable outputs. Manual reset and margin disable inputs offer additional flexibility.

All voltage detectors offer two configurable thresholds for undervoltage/overvoltage or dual undervoltage detection. One high voltage input (IN1) provides detector threshold voltages from +2.5V to +13.2V in 50mV increments, or from +1.25V to +7.625V in 25mV increments. A bipolar input (IN2) provides detector threshold voltages from ±2.5V to ±15.25V in 50mV increments, or from ±1.25V to ±7.625V in 25mV increments. Positive inputs (IN3–IN6) provide detector threshold voltages from +1V to +5.5V in 20mV increments, or from +0.5V to +3.05V in 10mV increments.

Programmable output stages control power-supply sequencing or system resets/interrupts. Programmable output options include: active-high, active-low, opendrain, weak pullup, push-pull, and charge pump. Programmable timing delay blocks configure each output to wait between 25µs and 1600ms before deasserting. A fault register logs the condition that caused each output to assert (undervoltage, overvoltage, manual reset, etc.).

An internal 10-bit ADC monitors the voltage detector inputs, and two auxiliary inputs through a multiplexer that automatically sequences through all inputs every 200ms. A SMBus™-/I²C-compatible, serial data interface programs and communicates with the configuration EEPROM, the configuration registers, the internal 4kb user EEPROM, the ADC registers, and the fault registers of the MAX6870/MAX6871.

The MAX6870/MAX6871 are available in a 7mm x 7mm x 0.8mm 32-pin thin QFN package and operate over the extended -40°C to +85°C temperature range.


  • Base Stations
  • Multimicroprocessor/Voltage Systems
  • Networking Systems
  • Servers and Workstations
  • Storage Equipment
  • Telecommunication/Central Office Systems

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

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MAX6870 Companion Parts

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