19-0243; Rev 1; 9/94
3 .0 V/3 .3 V Mic ro p ro c e s s o r S u p e rvis o ry Circ u it s
MAX972,4–806TS/R
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ RESET and RESET Outputs
♦ Manual Reset Input
–————–
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 relia-
b ility a nd a c c ura c y c omp a re d to s e p a ra te ICs or
discrete components.
♦ Precision Supply-Voltage Monitor
♦ 200ms Reset Time Delay
♦ Watchdog Timer (1.6sec timeout)
♦ Battery-Backup Power Switching—
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
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:
Battery Can Exceed V in Normal Operation
CC
♦ 40µA V Supply Current
CC
♦ 1µA Battery Supply Current
♦ Voltage Monitor for Power-Fail or
Low-Battery Warning
–————–
♦ Guaranteed RESET Assertion to V = 1V
CC
♦ 8-Pin DIP and SO Packages
______________Ord e rin g In fo rm a t io n
PART**
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX690_CPA
MAX690_CSA
MAX690_C/D
MAX690_EPA
MAX690_ESA
MAX690_MJA
Part
0°C to +70°C
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
MAX690
MAX704
MAX802
MAX804
MAX805
MAX806
±4%
±4%
±2%
±2%
±4%
±2%
±75mV
±75mV
±2%
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
✓
✓
✓
✓
✓
8 CERDIP
±2%
±75mV
±2%
Ordering Information continued on last page.
* 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.
________________________Ap p lic a t io n s
Battery-Powered Computers and Controllers
Embedded Controllers
_________Typ ic a l Op e ra t in g Circ u it s
Intelligent Instruments
Automotive Systems
REGULATED +3.3V OR +3.0V
Critical µP Power Monitoring
Portable Equipment
V
CC
UNREGULATED
DC
µP
0.1µF
V
CC
RESET
(RESET)
RESET
__________________P in Co n fig u ra t io n
R1
NMI
PFO
TOP VIEW
MAX690T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
I/O LINE
GND
PFI
WDI
3.6V
LITHIUM
BATTERY
R2
1
2
3
4
8
7
6
5
BUS
V
VBATT
OUT
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
V
OUT
VBATT
RESET (RESET)
WDI <MR>
PFO
V
CC
GND
V
CC
CMOS RAM
GND
GND
PFI
0.1µF
0.1µF
DIP/SO
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
< > ARE FOR MAX704T/S/R, MAX806T/S/R
See last page for MAX704T/S/R, MAX806T/S/R.
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .