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 signicantly 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
Benets 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 specic 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