MAX690T/S/R, MAX704T/S/R,
MAX802T/S/R, MAX804‒MAX806T/S/R
3.0V/3.3V Microprocessor
Supervisory Circuits
General Description
Features
● RESET and RESET Outputs
● Manual Reset Input
● Precision Supply-Voltage Monitor
● 200ms Reset Time Delay
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.
● Watchdog Timer (1.6sec timeout)
● Battery-Backup Power Switching—Battery Can
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:
Exceed V
in Normal Operation
Supply Current
CC
● 40µA V
CC
● 1µA Battery Supply Current
● Voltage Monitor for Power-Fail or Low-Battery
Warning
● Guaranteed RESET Assertion to V
● 8-Pin DIP and SO Packages
= 1V
CC
Applications
●
Battery-Powered Computers and Controllers
● Embedded Controllers
● Intelligent Instruments
● Critical µP Power Monitoring
● Portable Equipment
MAX690
MAX704
MAX802
MAX804
MAX805
MAX806
±4%
±4%
±2%
±2%
±4%
±2%
±75mV
±75mV
±2%
Ordering Information
±2%
PART**
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
±75mV
±2%
MAX690_CPA
MAX690_CSA
MAX690_C/D
MAX690_EPA
MAX690_ESA
MAX690_MJA
0°C to +70°C
0°C to +70°C
Dice*
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 Plastic DIP
8 SO
Typical Operating Circuits
REGULATED +3.3V OR +3.0V
V
UNREGULATED
DC
CC
µP
8 CERDIP
0.1µF
V
CC
RESET
RESET
(RESET)
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
R1
R2
NMI
PFO
WDI
MAX690T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
I/O LINE
GND
PFI
**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.
3.6V
BUS
LITHIUM
BATTERY
V
VBATT
OUT
GND
V
CC
CMOS RAM
GND
0.1µF
0.1µF
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
Typical Operating Circuits continued at at end of data
sheet.
Pin Configuration appears at end of data sheet.
19-0243; Rev 3; 4/15