MAX706ESA
Low-Cost, uP Supervisory Circuits

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Datasheet

Size: 99.97KB
Page: 12
PDF: MAX706ESA.pdf
  • Description:
    Low-Cost, uP Supervisory Circuits
  • MFG:
    MAXIM [Maxim Integrated Products]
 

Abstract


MAX705–MAX708/MAX813L
Low-Cost, ?P Supervisory Circuits
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
1
2
3
4
8
7
6
5
WDO
RESET (RESET)
WDI
PFO
PFI
GND
V
CC
MR
DIP/SO
MAX705
MAX706
MAX813L
1
2
3
4
8
7
6
5
RESET
RESET
N.C.
PFO
PFI
GND
V
CC
MR
DIP/SO
MAX707
MAX708
( ) ARE FOR MAX813L ONLY.
Pin Configurations continued at end of data sheet.
_________________Pin Configurations
V
CC
PFI
MR PFO
WDO

RESET
UNREGULATED DC
PUSHBUTTON
SWITCH
PFI I/O LINE
INTERRUPT
?P
MAX705
MAX706
MAX813L
MAX667
+5V DC LINEAR
REGULATOR
V
CC
RESET
NMI
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-4334; Rev. 5; 9/95
_______________General Description
The MAX705-MAX708/MAX813L microprocessor (?P)
supervisory circuits reduce the complexity and number
of components required to monitor power-supply and
battery functions in ?P 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
brownout conditions.
2) An independent watchdog output that goes low if
the watchdog input has not been toggled within 1.6
seconds.
3) A 1.25V threshold detector for power-fail warning,
low-battery detection, or for monitoring a power sup-
ply other than +5V.
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 ?MAX
packages.
_______________________Applications
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical ?P Power Monitoring
___________________________Features
' ?MAX Package: Smallest 8-Pin SO
' Guaranteed RESET Valid at V
CC
= 1V
' Precision Supply-Voltage Monitor
4.65V in MAX705/MAX707/MAX813L
4.40V in MAX706/MAX708
' 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
______________Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX705CPA 8 Plastic DIP
MAX705CSA 0°C to +70°C 8 SO
MAX705C/D 0°C to +70°C Dice*
Ordering Information continued at end of data sheet.
* Dice are specified at T
A
= +25°C.
**Contact factory for availability and processing to MIL-STD-883.
0°C to +70°C
MAX705CUA 0°C to +70°C 8 ?MAX

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