MAX705 Maxim, MAX705 Datasheet
MAX705
Manufacturer Part Number
MAX705
Description
Low-Cost / uP Supervisory Circuits
Manufacturer
Maxim
Datasheet
1.MAX705.pdf
(12 pages)
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19-4334; Rev. 5; 9/95
The MAX705-MAX708/MAX813L microprocessor (µP)
supervisory circuits reduce the complexity and number
of components required to monitor power-supply and
battery functions in µP systems. These devices signifi-
cantly improve system reliability and accuracy com-
pared to separate ICs or discrete components.
The MAX705/MAX706/MAX813L provide four functions:
1) A reset output during power-up, power-down, and
2) An independent watchdog output that goes low if
3) A 1.25V threshold detector for power-fail warning,
4) An active-low manual-reset input.
The MAX707/MAX708 are the same as the MAX705/
MAX706, except an active-high reset is substituted for
the watchdog timer. The MAX813L is the same as the
MAX705, except RESET is provided instead of RESET.
Two supply-voltage monitor levels are available: The
MAX705/MAX707/MAX813L generate a reset pulse when
the supply voltage drops below 4.65V, while the
MAX706/MAX708 generate a reset pulse below 4.40V.
All four parts are available in 8-pin DIP, SO and µMAX
packages.
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
_______________General Description
_______________________Applications
brownout conditions.
the watchdog input has not been toggled within 1.6
seconds.
low-battery detection, or for monitoring a power sup-
ply other than +5V.
UNREGULATED DC
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
PUSHBUTTON
SWITCH
+5V DC LINEAR
________________________________________________________________ Maxim Integrated Products
REGULATOR
MAX667
V
PFI
MR
CC
MAX813L
MAX705
MAX706
RESET
Low-Cost, µP Supervisory Circuits
WDO
PFO
PFI
RESET
I/O LINE
INTERRUPT
V
NMI
CC
P
Ordering Information continued at end of data sheet.
* Dice are specified at T
**Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations
______________Ordering Information
MAX705CPA
MAX705CSA
MAX705CUA
MAX705C/D
___________________________Features
( ) ARE FOR MAX813L ONLY.
Pin Configurations continued at end of data sheet.
µMAX Package: Smallest 8-Pin SO
Guaranteed RESET Valid at V
Precision Supply-Voltage Monitor
200ms Reset Pulse Width
Debounced TTL/CMOS-Compatible
Manual-Reset Input
Independent Watchdog Timer—1.6sec Timeout
(MAX705/MAX706)
Active-High Reset Output
(MAX707/MAX708/MAX813L)
Voltage Monitor for Power-Fail or Low-Battery
Warning
TOP VIEW
PART
4.65V in MAX705/MAX707/MAX813L
4.40V in MAX706/MAX708
GND
GND
V
V
MR
PFI
MR
PFI
CC
CC
1
2
3
4
1
2
3
4
TEMP. RANGE
A
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
= +25°C.
MAX813L
MAX705
MAX706
DIP/SO
MAX707
MAX708
DIP/SO
CC
8
7
6
5
8
7
6
5
= 1V
WDO
RESET (RESET)
WDI
PFO
8 Plastic DIP
8 SO
8 µMAX
Dice*
RESET
RESET
N.C.
PFO
PIN-PACKAGE
1
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