Datasheet
General Description
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 signicantly improve
system reliability and accuracy compared 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 supply
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 µMAX
®
packages.
Applications
● Computers
● Controllers
● Intelligent Instruments
● Critical μP Power Monitoring
Benets and Features
● Supervisory-Function Integration Significantly
Improves System Reliability While Reducing Board
Space
• μMAX Package
• Guaranteed RESET Valid at V
CC
= 1V
- 200ms Reset Pulse Width
- Debounced TTL/CMOS-Compatible Manual-
Reset Input
- Active-High Reset Output (MAX707/MAX708/
MAX813L)
• Precision-Supply Voltage Monitor
- 4.65V (MAX705/MAX707/MAX813L)
- 4.40V (MAX706/MAX708)
• Voltage Monitor for Power-Fail or Low-Battery
Warning
19-4334; Rev. 11; 7/18
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
Ordering Information continued at end of data sheet.
Click here for production status of specic part numbers.
*Dice are specified at T
A
= +25°C.
**Contact factory for availability and processing to MIL-STD-883.
Devices in PDIP, SO, and μMAX packages are available in both
leaded and lead(Pb)-free/RoHS-compliant packaging. Specify
lead-free by adding the + symbol at the endof the part number
when ordering.
Lead-free packaging is not available for CERDIP packages.
PART TEMP RANGE PIN-PACKAGE
MAX705CPA 0°C to +70°C 8 Plastic DIP
MAX705CSA 0°C to +70°C 8 SO
MAX705CUA 0°C to +70°C 8 μMAX
MAX705C/D 0°C to +70°C Dice*
V
CC
PFI
MR
PFO
WDO
RESET
UNREGULATED DC
PUSHBUTTON
SWITCH
PFI
I/O LINE
INTERRUPT
µP
MAX705
MAX706
MAX813L
MAX667
+5V DC LINEAR
REGULATOR
V
CC
RESET
NMI
MAX705–MAX708/MAX813L Low-Cost, μP Supervisory Circuits
Typical Operating Circuit
Ordering Information