19-1615; Rev 2; 7/00
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
General Description
The MAX6361–MAX6364 supervisory circuits reduce the
complexity and number of components required for
power-supply monitoring and battery control functions in
microprocessor (µP) systems. The circuits significantly
improve system reliability and accuracy compared to that
obtainable with separate ICs or discrete components.
Their functions include µP reset, backup battery
switchover, and power failure warning.
The MAX6361–MAX6364 operate from supply voltages as
low as +1.2V. The factory-preset reset threshold voltage
ranges from 2.32V to 4.63V (see
Ordering Information).
These devices provide a manual reset input (MAX6361),
watchdog timer input (MAX6362), battery-on output
(MAX6363), and an auxiliary adjustable reset input
(MAX6364). In addition, each part type is offered in three
reset output versions: an active-low push-pull reset, an
active-low open-drain reset, and an active-high open-
drain reset (see
Selector Guide
at end of data sheet).
Features
o
Low +1.2V Operating Supply Voltage
(V
CC
or V
BATT
)
o
Precision Monitoring of +5.0V, +3.3V, +3.0V, and
+2.5V Power-Supply Voltages
o
Debounced Manual Reset Input (MAX6361)
o
Watchdog Timer with 1.6s Timeout Period
(MAX6362)
o
Battery-On Output Indicator (MAX6363)
o
Auxiliary User-Adjustable RESET IN (MAX6364)
o
Three Available Output Structures
Push-Pull
RESET,
Open-Drain
RESET,
Open-Drain RESET
o
RESET/RESET Valid Down to 1.2V Guaranteed
(V
CC
or V
BATT
)
o
Power-Supply Transient Immunity
o
150ms (min) Reset Timeout Period
o
Small 6-Pin SOT23 Package
MAX6361–MAX6364
Ordering Information
Applications
Computers
Controllers
Intelligent Instruments
Critical µP/µC
Power Monitoring
Fax Machines
Industrial Control
POS Equipment
Portable/Battery-Powered
Equipment
PART
MAX6361LUT_
_-T
MAX6361PUT_ _-T
MAX6361HUT_ _-T
MAX6362LUT_
_-T
MAX6362PUT_ _-T
MAX6362HUT_ _-T
MAX6363LUT_
_-T
MAX6363PUT_ _-T
MAX6363HUT_ _-T
MAX6364LUT_
_-T
MAX6364PUT_ _-T
MAX6364HUT_ _-T
RESET, RESET
1
6
BATT
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
Pin Configurations
TOP VIEW
GND
2
MAX6361
5
OUT
Note:
These parts offer a choice of reset threshold voltages.
From the table below, select the suffix corresponding to the
desired threshold voltage and insert it into the part number to
complete it. When ordering from the factory, there is a 2500-
piece minimum on the SOT package (tape-and-reel only).
RESET THRESHOLD RANGES (V)
MIN
4.50
4.25
3.00
2.85
2.55
2.25
TYP
4.63
4.38
3.08
2.93
2.63
2.32
MAX
4.75
4.50
3.15
3.00
2.70
2.38
1
MR
3
4
V
CC
SUFFIX
46
SOT23-6
Pin Configurations continued at end of data sheet.
Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
44
31
29
26
23
________________________________________________________________
Maxim Integrated Products
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
