MAX690T/S/R, MAX704T/S/R,
MAX802T/S/R, MAX804‒MAX806T/S/R
3.0V/3.3V Microprocessor
Supervisory Circuits
General Description
These microprocessor (µP) supervisory circuits reduce the
complexity and number of components required for pow-
er-supply monitoring and battery-control functions in µP
systems. They significantly improve system reliability and
accuracy compared to separate ICs or discrete components.
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:
MAX690 ±4% ±75mV
MAX704
±4% ±75mV
MAX802 ±2% ±2%
MAX804
±2% ±2%
MAX805
±4% ±75mV
MAX806
±2% ±2%
Typical Operating Circuits
REGULATED +3.3V OR +3.0V
UNREGULATED
DC
0.1µF
VCC
RESET
R1 (RESET)
MAX690T/S/R PFO
R2
3.6V
LITHIUM
PFI
MAX802T/S/R
MAX804T/S/R
WDI
MAX805T/S/R
BATTERY
VBATT
GND
VOUT
0.1µF
0.1µF
VCC µP
RESET
NMI
I/O LINE GND
BUS
VCC
CMOS RAM
GND
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
Features
●● 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
Applications
●● Battery-Powered Computers and Controllers
●● Embedded Controllers
●● Intelligent Instruments
●● Critical µP Power Monitoring
●● Portable Equipment
Ordering Information
PART**
MAX690_CPA
MAX690_CSA
MAX690_C/D
MAX690_EPA
MAX690_ESA
MAX690_MJA
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
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.
Typical Operating Circuits continued at at end of data
sheet.
Pin Configuration appears at end of data sheet.
19-0243; Rev 3; 4/15
