MAX690T/S/R, MAX704T/S/R,
MAX802T/S/R, MAX804‒MAX806T/S/R
3.0V/3.3V Microprocessor
Supervisory Circuits
General Description
Features
These devices are designed for use in systems powered
by 3.0V or 3.3V supplies. See the selector guide in the
back of this data sheet for similar devices designed for
5V systems. The suffixes denote different reset threshold
voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see the
Reset Threshold section in the Detailed Description). All
these parts are available in 8-pin DIP and SO packages.
Functions offered in this series are as follows:
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These microprocessor (µP) supervisory circuits reduce the
complexity and number of components required for power-supply monitoring and battery-control functions in µP
systems. They significantly improve system reliability and
accuracy compared to separate ICs or discrete components.
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MAX704
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MAX690
±4%
±75mV
±4%
±75mV
±2%
±2%
MAX804
±2%
±2%
MAX805
±4%
±75mV
±2%
±2%
MAX806
R1
RESET
(RESET)
R2
NMI
I/O LINE GND
MAX804T/S/R
MAX805T/S/R
VBATT
GND
0.1µF
µP
RESET
MAX690T/S/R PFO
PFI MAX802T/S/R WDI
3.6V
LITHIUM
BATTERY
BUS
VOUT
0.1µF
VCC
CMOS RAM
GND
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
Typical Operating Circuits continued at at end of data
sheet.
19-0243; Rev 3; 4/15
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Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Critical µP Power Monitoring
Portable Equipment
Ordering Information
PART**
TEMP RANGE
MAX690_CPA
0°C to +70°C
8 Plastic DIP
PIN-PACKAGE
MAX690_CSA
0°C to +70°C
8 SO
0°C to +70°C
Dice*
MAX690_EPA
VCC
VCC
Applications
-40°C to +85°C
8 Plastic DIP
MAX690_ESA
REGULATED +3.3V OR +3.0V
0.1µF
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RESET and RESET Outputs
Manual Reset Input
Precision Supply-Voltage Monitor
200ms Reset Time Delay
Watchdog Timer (1.6sec timeout)
Battery-Backup Power Switching—Battery Can
Exceed VCC in Normal Operation
40µA VCC Supply Current
1µA Battery Supply Current
Voltage Monitor for Power-Fail or Low-Battery
Warning
Guaranteed RESET Assertion to VCC = 1V
8-Pin DIP and SO Packages
MAX690_C/D
Typical Operating Circuits
UNREGULATED
DC
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-40°C to +85°C
8 SO
MAX690_MJA
-55°C to +125°C
8 CERDIP
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
**These parts offer a choice of reset threshold voltage. Select
the letter corresponding to the desired nominal reset threshold
voltage (T = 3.075V, S = 2.925V, R = 2.625V) and insert it into
the blank to complete the part number.
Devices in PDIP and SO packages are available in both leaded
and lead(Pb)-free packaging. Specify lead free by adding the +
symbol at the end of the part number when ordering. Lead free
not available for CERDIP package.
Pin Configuration appears at end of data sheet.
