19-2533; Rev 2; 12/05
Ultra-Low-Power Voltage Detectors and
µP Supervisory Circuits
General Description
Features
The MAX6461–MAX6466 family of ultra-low-power voltage
detectors and µP reset supervisory circuits monitors bat-
tery, power-supply, and system voltages. Each circuit
includes a precision bandgap reference, a comparator,
internally trimmed resistor networks that set specified trip
thresholds, and an internal 5% threshold hysteresis circuit
(see the Functional Diagram). Output is asserted when
♦ Ultra-Low 1.0µA Supply Current
♦ Preset Thresholds from +1.6V to +5.5V in 100mV
Increments
♦ Internal 5% Threshold Hysteresis
♦ ±±.5% Threshold Accuracy ꢀOer Temperature
♦ Internal Timeout Period ꢀption (150ms min)
♦ Immune to Short Voltage Transients
♦ No External Components
V
falls below the internal V
and remains asserted
CC
until V
TH-
rises above V + (V + = V - × 1.05). These
CC
TH
TH
TH
devices provide excellent circuit reliability and low cost
by eliminating external components and adjustments
when monitoring nominal system voltages from +1.6V to
+5.5V. The MAX6461/MAX6462/MAX6463 are voltage
detectors with a propagation delay of 17µs.
♦ AOailable in Three ꢀutput ꢀptions: Push-Pull
(ActiOe Low/ActiOe High) and ꢀpen Drain (ActiOe
Low)
The MAX6464/MAX6465/MAX6466 are µP supervisory
circuits with a minimum reset timeout period of 150ms. All
devices are available with thresholds from +1.6V to +5.5V
in 100mV increments.
♦ Fully Specified from -40°C to +1±5°C
♦ Small SC70 and SꢀT±3 Packages
Ordering Information
The family is available with three output stage options:
push-pull with active-low output, push-pull with active-
high output, and open drain with active-low output. These
devices are available in SC70 and SOT23 packages
specified over the -40°C to +125°C temperature range.
PART
TEMP RANGE
PIN-PACKAGE
MAX6461XR_ _-T
MAX6461UR_ _-T
MAX6461UK_ _-T
MAX646±XR_ _-T
MAX6462UR_ _-T
MAX6462UK_ _-T
-40°C to +125°C 3 SC70-3
-40°C to +125°C 3 SOT23-3
-40°C to +125°C 5 SOT23-5
-40°C to +125°C 3 SC70-3
-40°C to +125°C 3 SOT23-3
-40°C to +125°C 5 SOT23-5
Applications
Precision Battery Monitoring
The MAX6461–MAX6466 are available in factory-set thresholds
from 1.6V to 5.5V in approximately 100mV increments. Choose
the desired voltage threshold suffix from Table 1 and insert it in
the blank spaces in the part number. There are 30 standard ver-
sions with a required order increment of 2500 pieces. Sample
stock generally is held on the standard versions only (Table 2).
Nonstandard versions require a 10k-piece order increment.
Contact factory for availability. All devices available in tape-and-
reel only.
Load Switching/Power Sequencing
Power-Supply Monitoring in Digital/Analog
Systems
Noise-Immune µP Reset Circuits
Portable/Battery-Powered Equipment
Cellular Phones/Cordless Phones
PDAs
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Portable Medical Devices
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
GND
1
2
N.C.
GND
GND
1
2
3
5
4
V
(OUT)/OUT
GND
1
2
CC
3
V
3
V
CC
CC
MAX6461–
MAX6466
MAX6461–
MAX6466
MAX6461–
MAX6466
(OUT)/OUT
(OUT)/OUT
SC70-3
SꢀT±3-3
( ) ARE FOR THE MAX6462/MAX6465 ONLY
SꢀT±3-5
________________________________________________________________ Maxim Integrated Products
1
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.