Features: 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
ApplicationTelecommunications/Central Office Systems
Networking Systems
Servers/Workstations
Basestations
Storage Equipment
Multimicroprocessor/Voltage SystemsPinout
SpecificationsAll Voltages referenced to GND
IN3IN6, ABP, SDA, SCL, A0, A1,
GPI1GPI4, MR, MARGIN, PO5PO8
(MAX6870), PO3/PO4/PO5 (MAX6871).......................-0.3V to +6V
IN1, PO1PO4 (MAX6870), PO1/PO2 (MAX6871)....-0.3V to +14V
IN2...........................................................................-20V to +20V
DBP, AUXIN1, AUXIN2, REFIN.....................................-0.3V to +3V
Input/Output Current (all pins)......................................... ±20mA
Continuous Power Dissipation (TA= +70°C)
32-Pin 7mm x 7mm Thin QFN
(derate 33.3mW/°C above +70°C)..............................2667mW
Operating Temperature Range...................... .....-40°C to +85°C
Maximum Junction Temperature........................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s)................... ..............+300°C DescriptionThe MAX6870/MAX6871 EEPROM-configurable, multi-voltage supply sequencers/supervisors monitor several voltage detector inputs, two auxiliary inputs, and fourgeneral-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 program-mable 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 of MAX6871 offer two configurable thresholds for undervoltage/overvoltage or dual undervoltage detection. One high voltage input (IN1) provides detec-tor threshold voltages from +2.5V to +13.2V in 50mV increments, or from +1.25V to +7.625V in 25mV incre-ments. 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 (IN3IN6) of MAX6871 provide detector threshold voltages from +1V to +5.5V in 20mV increments, or from +0.5V to +3.05V in 10mV increments. sequencing or system resets/interrupts. Programmable output options of MAX6871 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 asser(undervoltage, overvoltage, manual reset, etc.).
An internal 10-bit ADC of MAX6871 monitors the voltage detector inputs, and two auxiliary inputs through a multiplexer that automatically sequences through all inputs every 200ms. A SMBus TM/I2CTM-compatible, serial data inter-face programs and communicates with the configuration EEPROM, the configuration registers, the internal 4kbuser EEPROM, the ADC registers, and the fault registers of the MAX6870/MAX6871. The MAX6870/MAX6871 are available in a 7mm x 7mmx 0.8mm 32-pin thin QFN package and operate over
MAX6871 Data Sheet
