MAX6826_05 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Dual Ultra-Low-Voltage SOT23 uP Supervisors with Manual Reset and Watchdog Timer

19-1867; Rev 2; 12/05
Dual Ultra-Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
General Description
The MAX6826–MAX6831 are ultra-low-voltage micro-
processor (µP) supervisory circuits designed to monitor
two power supplies and have manual reset and watch-
dog input functions. These devices assert a system reset
if any of the monitored supplies fall below the prepro-
grammed thresholds, and maintain reset for a minimum
timeout period after the supplies rise above the threshold.
Microprocessor supervisors significantly improve system
reliability and accuracy compared to separate ICs or dis-
crete components. These devices monitor primary volt-
ages from +1.8V to +5.0V and secondary voltages from
+0.9V to +2.5V. These devices are guaranteed to be in
the correct state for V_CC down to +1.0V.
A variety of preprogrammed reset threshold voltages
are available (see the Threshold Suffix Guide). The
devices include manual reset and watchdog inputs. The
MAX6829/MAX6830/MAX6831 provide a factory-
trimmed threshold to monitor a 2nd voltage down to
+0.9V. The MAX6826/MAX6829 have a push-pull
RESET, the MAX6827/MAX6830 have a push-pull
RESET and the MAX6828/MAX6831 have an open-drain
RESET. The MAX6826/MAX6827/MAX6828 have an aux-
iliary monitor that allows user adjustable input to monitor
voltages down to +0.6V. See Selector Guide for func-
tions available.
________________________Applications
Portable/Battery-
Powered Equipment
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical µP Monitoring
Multivoltage Systems
Pin Configuration
TOP VIEW
RESET(RESET) 1
GND 2
MAX6826–
MAX6831
6 V_CC
5 RESET IN/V_CC2
MR 3
4 WDI
SOT23-6
(RESET) MAX6827/MAX6830 ONLY
RESET IN FOR MAX6826/MAX6827/MAX6828 ONLY
V_CC2 FOR MAX6829/MAX6830/MAX6831 ONLY
Typical Operating Circuit, Threshold Suffix Guide, and
Selector Guide appear at end of data sheet.
Features
♦ Monitor Primary V_CC Supplies from +1.8V
to +5.0V and Secondary V_CC2 Supplies
from +0.9V to +2.5V
♦ User Adjustable RESET IN Down to +0.63V
(MAX6826/MAX6827/MAX6828)
♦ 140ms (min) Reset Timeout Delay
♦ 1.6s Watchdog Timeout Period
♦ Manual Reset Input
♦ Three Reset Output Options
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
♦ Guaranteed Reset Valid Down to V_CC = +1.0V
♦ Immune to Short Negative V_CC Transients
♦ No External Components
♦ Small 6-pin SOT23 Packages
Ordering Information
PART^†
TEMP RANGE
PIN-PACKAGE
MAX6826_UT-T
-40°C to +125°C 6 SOT23-6
MAX6827_UT-T
-40°C to +125°C 6 SOT23-6
MAX6828_UT-T
-40°C to +125°C 6 SOT23-6
MAX6829_ _UT-T
-40°C to +125°C 6 SOT23-6
MAX6830_ _UT-T
-40°C to +125°C 6 SOT23-6
MAX6831_ _UT-T -40°C to +125°C 6 SOT23-6
†_{Insert the desired suffix letter (from Standard Versions table) into}
the blanks to complete the part number.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Standard Versions Table*
MAX6826/MAX6827/MAX6828
L
S
R
Z
V
*Samples are typically available for standard versions only.
The MAX6826/MAX6827/MAX6828 require a 2.5k minimum
order increment for all versions. Contact factory for availability.
Standard Versions Table continued at end of data sheet.
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