MAX705–MAX708/MAX813L
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 significantly 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, lowbattery 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
Pin Configurations appear at end of data sheet.
Low-Cost, μP Supervisory Circuits
Benefits and Features
●● Supervisory-Function Integration Significantly
Improves System Reliability While Reducing Board
Space
• μMAX Package
• Guaranteed RESET Valid at VCC = 1V
-- 200ms Reset Pulse Width
-- Debounced TTL/CMOS-Compatible ManualReset 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
Ordering Information
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*
*Dice are specified at TA = +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.
Ordering Information continued at end of data sheet.
Typical Operating Circuit
UNREGULATED DC
MAX667
+5V DC LINEAR
REGULATOR
µP
VCC
PFI
µMAX is a registered trademark of Maxim Integrated Products, Inc.
19-4334; Rev. 10; 4/15
PUSHBUTTON
SWITCH
RESET
PFI
MAX705
WDO
MR MAX706 PFO
MAX813L
VCC
RESET
I/O LINE
NMI
INTERRUPT
