General Description
The MAX6872/MAX6873 EEPROM-configurable, multi-
voltage supply sequencers/supervisors monitor several
voltage detector inputs and four general-purpose logic
inputs. The MAX6872/MAX6873 feature programmable
outputs for highly configurable power-supply sequencing
applications. The MAX6872 features six voltage detector
inputs and eight programmable outputs, while the
MAX6873 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 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 (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, open-
drain, 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 SMBus
TM
-/I
2
C-compatible, serial data interface
programs and communicates with the configuration
EEPROM, the configuration registers, the internal 4kb
user EEPROM, and the fault registers of the
MAX6872/MAX6873.
The MAX6872/MAX6873 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.
Applications
Telecommunications/Central Office Systems
Networking Systems
Servers/Workstations
Base Stations
Storage Equipment
Multimicroprocessor/Voltage Systems
Features
♦ Six (MAX6872) or Four (MAX6873) 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 (MAX6872) or Two (MAX6873) Positive
Voltage Inputs (+0.5V to +3.05V or +1V to
+5.5V Thresholds)
♦ Four General-Purpose Logic Inputs
♦ Two Configurable Watchdog Timers
♦ Eight (MAX6872) or Five (MAX6873)
Programmable Outputs
Active-High, Active-Low, Open-Drain, Weak
Pullup, Push-Pull, Charge-Pump
Timing Delays from 25µs to 1600ms
♦ Margining Disable and Manual Reset Controls
♦ 4kb Internal User EEPROM
Endurance: 100,000 Erase/Write Cycles
Data Retention: 10 Years
♦ I
2
C/SMBus-Compatible Serial
Configuration/Communication Interface
♦ ±1% Threshold Accuracy
MAX6872/MAX6873
EEPROM-Programmable, Hex/Quad,
Power-Supply Sequencers/Supervisors
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3439; Rev 0; 10/04
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
Pin Configurations, Typical Operating Circuit, and Selector
Guide appear at end of data sheet.
