The MAX6889/MAX6890/MAX6891 EEPROM-configurable,
multivoltage supply sequencers/supervisors
monitor several voltage detector inputs and generalpurpose
logic inputs and feature programmable outputs
for highly configurable power-supply sequencing
applications. The MAX6889 features eight voltage
detector inputs and ten programmable outputs. The
MAX6890 features six voltage detector inputs and eight
programmable outputs, while the MAX6891 features
four voltage detector inputs and five programmable
outputs. Manual reset and margin disable inputs offer
additional flexibility.
All voltage detectors offer a configurable threshold for
undervoltage detection. High-voltage input IN1 monitors
voltages from 2.5V to 13.2V in 50mV increments, or from
1.25V to 7.625V in 25mV increments. Inputs IN2–IN7
monitor voltages from 1V to 5.5V in 20mV increments or
from 0.5V to 3.05V in 10mV increments. High-voltage
input IN8 monitors voltages from 2.5V to 15.25V in 50mV
increments, or from 1.25V to 7.625V in 25mV increments.
Programmable output stages control power-supply
sequencing or system resets/interrupts. Programmable
output options include: active-high, active-low, open
drain, and weak pullup. Programmable timing delay
blocks configure each output to wait between 25μs and
1600ms before deasserting.
The MAX6889/MAX6890/MAX6891 feature a watchdog
timer for added flexibility. Program the watchdog timer
to assert one or more programmable outputs. The initial
and normal watchdog timeout periods are independently
programmable from 6.25ms to 102.4s.
An SMBus?/I2C-compatible, 2-wire serial data interface
programs and communicates with the configuration
EEPROM, the configuration registers, and the
internal 512-bit user EEPROM.
The MAX6889/MAX6890/MAX6891 are available in
5mm x 5mm x 0.8mm thin QFN packages and are
specified to operate over the extended temperature
range (-40°C to +85°C).
Applications
Telecommunication/Central Office Systems
Networking Systems
Servers/Workstations
Base Stations
Storage Equipment
Multi-Microprocessor/Voltage Systems