MAX704RCSA Maxim Integrated Products, MAX704RCSA Datasheet

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MAX704RCSA

Manufacturer Part Number
MAX704RCSA
Description
3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 2.625V. Active-low reset. Manual reset input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV
Manufacturer
Maxim Integrated Products
Datasheet

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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 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:
________________________Applications
19-0243; Rev 2; 12/05
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.
MAX690
MAX704
MAX802
MAX804
MAX805
MAX806
_______________General Description
__________________Pin Configuration
Part
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
< >
3.0V/3.3V Microprocessor Supervisory Circuits
TOP VIEW
ARE FOR MAX704T/S/R, MAX806T/S/R
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
Portable Equipment
V
GND
V
OUT
PFI
CC
________________________________________________________________ Maxim Integrated Products
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
±4%
±4%
±2%
±2%
±4%
±2%
VBATT
RESET (RESET)
WDI
PFO
<
MR
>
±75mV
±75mV
±75mV
±2%
±2%
±2%
♦ Manual Reset Input
♦ Precision Supply-Voltage Monitor
♦ 200ms Reset Time Delay
♦ Watchdog Timer (1.6s timeout)
♦ Battery-Backup Power Switching—
♦ 40µA V
♦ 1µA Battery Supply Current
♦ Voltage Monitor for Power-Fail or
♦ Guaranteed
♦ 8-Pin DIP and SO Packages
____________________________Features
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
______________Ordering Information
MAX690_CPA
MAX690_CSA
MAX690_C/D
MAX690_EPA
MAX690_ESA
MAX690_MJA
Battery Can Exceed V
Low-Battery Warning
R
PART**
UNREGULATED
E
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
See last page for MAX704T/S/R, MAX806T/S/R.
R1
R2
S
E
DC
T
CC
BATTERY
LITHIUM
and RESET Outputs
0.1μF
3.6V
Supply Current
R
REGULATED +3.3V OR +3.0V
E
0.1μF
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
S
PFI
VBATT
TEMP RANGE
E
0°C to +70°C
0°C to +70°C
0°C to +70°C
T
V
MAX690T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
CC
Assertion to V
GND
CC
in Normal Operation
(RESET)
RESET
V
PFO
WDI
OUT
0.1μF
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP
CC
PIN-PACKAGE
= 1V
V
RESET
NMI
I/O LINE
V
CC
CMOS RAM
CC
BUS
μP
GND
GND
1

Related parts for MAX704RCSA

MAX704RCSA Summary of contents

Page 1

... GND MAX805T/S/R 4 PFI MAX806T/S/R DIP/ ARE FOR MAX804T/S/R, MAX805T/S/R < > ARE FOR MAX704T/S/R, MAX806T/S/R ________________________________________________________________ Maxim Integrated Products 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. ____________________________Features – — — — — ...

Page 2

Microprocessor Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) V .........................................................................-0.3V to 6.0V CC VBATT ....................................................................-0.3V to 6.0V All Other Inputs ...................-0.3V to the higher of V Continuous Input Current V ..................................................................................100mA CC VBATT ...............................................................................18mA GND ...

Page 3

Microprocessor Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T 5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; T PARAMETER SYMBOL V in Battery-Backup Mode OUT Battery Switch Threshold, V Falling CC Battery Switch ...

Page 4

Microprocessor Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T 5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; T PARAMETER SYMBOL PFI Input Threshold V PFT PFI Input Current PFI Hysteresis, PFI Rising V ...

Page 5

Microprocessor Supervisory Circuits __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted -to-V ON-RESISTANCE CC OUT vs. TEMPERATURE 5 VBATT = ...

Page 6

Microprocessor Supervisory Circuits ______________________________________________________________Pin Description PIN MAX690 MAX704 MAX804 NAME MAX802 MAX806 MAX805 OUT GND PFI – — — – ...

Page 7

Microprocessor Supervisory Circuits V BATT BATTERY SWITCHOVER CIRCUITRY V CC BATTERY SWITCHOVER COMPARATOR 1.237V RESET COMPARATOR 1.237V * * WATCHDOG WDI TIMER ** MR PFI POWER-FAIL COMPARATOR V PFT * MAX690T/S/R, MAX802T/S/R, MAX804T/S/R, MAX805T/S/R ONLY ** MAX704T/S/R, MAX806T/S/R ONLY ...

Page 8

Microprocessor Supervisory Circuits Backup-Battery Switchover In the event of a brownout or power failure, it may be necessary to preserve the contents of RAM. With a backup battery installed at VBATT, the devices auto- matically switch RAM to backup ...

Page 9

Microprocessor Supervisory Circuits 3.0V OR 3.3V MAX690T/S MAX704T/S/R MAX802T/S/R 1N4148 MAX804T/S/R MAX805T/S/R VBATT MAX806T/S/R (RESET) 0.47F GND ARE FOR MAX804T/S/R, MAX805T/S/R ONLY Figure 3. Using a SuperCap as a Backup Power Source Connecting an ...

Page 10

Microprocessor Supervisory Circuits MAX690T/S/R PFI MAX704T/S/R MAX802T/S MAX804T/S/R MAX805T/S/R MAX806T/S/R C1* PFO TO μP PFO TRIP ( ...

Page 11

Microprocessor Supervisory Circuits BUFFERED RESET TO OTHER SYSTEM COMPONENTS V CC MAX690T/S/R 4.7kΩ MAX704T/S/R RESET MAX802T/S/R MAX806T/S/R GND Figure 6. Interfacing to µPs with Bidirectional Reset I/O 100 100 RESET COMPARATOR OVERDRIVE (V ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2005 Maxim Integrated Products ___________________Chip Topography ...

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