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MAX690_MJA

Description
3.0V/3.3V Microprocessor Supervisory Circuits
File Size168KB,12 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

MAX690_MJA Overview

3.0V/3.3V Microprocessor Supervisory Circuits

19-0243; Rev 2; 12/05
3.0V/3.3V Microprocessor Supervisory Circuits
_______________General Description
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-
bility 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:
ow
ind
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Re
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Po ara
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Co
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A
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i
res
up
Sw
Th
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Ba
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Re t
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Ma
ut
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____________________________Features
–——
——–
RESET and RESET Outputs
Manual Reset Input
Precision Supply-Voltage Monitor
200ms Reset Time Delay
Watchdog Timer (1.6s timeout)
Battery-Backup Power Switching—
Battery Can Exceed V
CC
in Normal Operation
40µA V
CC
Supply Current
1µA Battery Supply Current
Voltage Monitor for Power-Fail or
Low-Battery Warning
–——
——–
Guaranteed RESET Assertion to V
CC
= 1V
8-Pin DIP and SO Packages
MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R
______________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
Part
MAX690
MAX704
MAX802
MAX804
MAX805
MAX806
±4%
±4%
±2%
±2%
±4%
±2%
±75mV
±75mV
±2%
±2%
±75mV
±2%
________________________Applications
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
Portable Equipment
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-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
REGULATED +3.3V OR +3.0V
UNREGULATED
DC
0.1μF
R1
V
CC
V
CC
RESET
(RESET)
PFO
__________________Pin Configuration
TOP VIEW
V
OUT
V
CC
GND
PFI
μP
RESET
NMI
I/O LINE GND
BUS
1
2
3
4
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
DIP/SO
8
7
6
5
VBATT
RESET (RESET)
WDI
<
MR
>
PFO
R2
PFI
MAX690T/S/R
WDI
3.6V
LITHIUM
BATTERY
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
GND
VBATT
0.1μF
V
OUT
0.1μF
V
CC
CMOS RAM
GND
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
< >
ARE FOR MAX704T/S/R, MAX806T/S/R
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
See last page for MAX704T/S/R, MAX806T/S/R.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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