MAX704TCSA ,3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 3.075V. Active-low reset. Manual reset input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mVGeneral Description ________
MAX704TCSA+ ,3.0V/3.3V Microprocessor Supervisory CircuitsFeaturesThese microprocessor (µP) supervisory circuits reduce the ● RESET and RESET Outputscomplexi ..
MAX704TCSA+T ,3.0V/3.3V Microprocessor Supervisory CircuitsFeaturesThese microprocessor (µP) supervisory circuits reduce the ● RESET and RESET Outputscomplexi ..
MAX704TESA ,3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 3.075V. Active-low reset. Manual reset input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mVGeneral Description ________
MAX704TESA ,3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 3.075V. Active-low reset. Manual reset input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mVFeatures– — — — — –These microprocessor (µP) supervisory circuits reduce' RESET and RESET Outputsth ..
MAX704TESA ,3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 3.075V. Active-low reset. Manual reset input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mVMAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/RReset WindowPower-Fail ComparatorPower-Fail Threshold ..
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MAX690RCSA-MAX690REPA-MAX690RESA-MAX690SCSA-MAX690SESA-MAX690TCPA-MAX690TCSA-MAX690TESA-MAX704RCPA-MAX704RCSA-MAX704RESA-MAX704R-ESA-MAX704SCSA-MAX704SESA-MAX704TCSA-MAX704TESA-MAX802REPA-MAX802RESA-MAX802SCPA-MAX802SCSA-MAX802SEPA-MAX802SESA-MAX802TCPA
3.0V or 3.3V microprocessor supervisory circuit. Reset threshold 2.625V. Active-low reset. Watchdog input. Backup-battery switch. Power-fail threshold accuracy +-4%. Power-fail comparator. Reset window +-75mV
_______________General DescriptionThese 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
Reset Thresholdsection in the Detailed Description). All
these parts are available in 8-pin DIP and SO packages.
Functions offered in this series are as follows:
________________________ApplicationsBattery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
Portable Equipment
____________________________Features–R—E—S—E—T–and RESET OutputsManual Reset InputPrecision Supply-Voltage Monitor200ms Reset Time DelayWatchdog Timer (1.6sec timeout)Battery-Backup Power Switching—
Battery Can Exceed VCCin Normal Operation40µA VCCSupply Current1µA Battery Supply CurrentVoltage Monitor for Power-Fail or
Low-Battery WarningGuaranteed –R—E—S—E—T– Assertion to VCC= 1V8-Pin DIP and SO Packages
______________Ordering Information
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.
MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R
3.0V/3.3V Microprocessor Supervisory Circuits
________________________________________________________________Maxim Integrated Products1
__________________Pin Configuration
_________Typical Operating Circuits
Call toll free 1-800-998-8800 for free samples or literature.19-0243; Rev 1; 9/94
MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R
3.0V/3.3V Microprocessor Supervisory Circuits_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T, VCC= 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S, VCC= 2.72V to
5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; TA= TMINto TMAX; unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Terminal Voltage (with respect to GND)
VCC.........................................................................-0.3V to 6.0V
VBATT....................................................................-0.3V to 6.0V
All Other Inputs...................-0.3V to the higher of VCCor VBATT
Continuous Input Current
VCC..................................................................................100mA
VBATT...............................................................................18mA
GND..................................................................................18mA
Output Current–R—E—S—E—T–, –P—F—O–....................................................................18mA
VOUT................................................................................100mA
Continuous Power Dissipation (TA= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C)..............727mW
SO (derate 5.88mW/°C above +70°C)...........................471mW
CERDIP (derate 8.00mW/°C above +70°C)...................640mW
Operating Temperature Ranges
MAX690_C_ _/MAX704_C_ _/MAX80_ _C_ _........0°C to +70°C
MAX690_E_ _/MAX704_E_ _/MAX80_ _E_ _......-40°C to +85°C
MAX690_M_ _/MAX704_M_ _/MAX80_ _M_ _...-55°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R
3.0V/3.3V Microprocessor Supervisory Circuits
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS (continued)(VCC= 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T, VCC= 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S, VCC= 2.72V to
5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; TA= TMINto TMAX; unless otherwise noted. Typical values are at TA= +25˚C.)
MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R
3.0V/3.3V Microprocessor Supervisory Circuits_______________________________________________________________________________________
Note 1: VCCsupply current, logic input leakage, watchdog functionality (MAX690_/802_/805_/804_), –M—R–functionality
(MAX704_/806_), PFI functionality, state of –R—E—S—E—T–(MAX690_/704_/802_/806_), and RESET (MAX804_/805_) tested at
VBATT = 3.6V, and VCC= 5.5V. The state of –R—E—S—E—T–or RESET and –P—F—O–is tested at VCC= VCCmin.
Note 2:Tested at VBATT = 3.6V, VCC= 3.5V and 0V. The battery current will rise to 10µA over a narrow transition window around
VCC= 1.9V.
Note 3:Leakage current into the battery is tested under the worst-case conditions at VCC= 5.5V, VBATT = 1.8V and at VCC= 1.5V,
VBATT= 1.0V.
Note 4:Guaranteed by design.
Note 5:When VSW> VCC> VBATT, VOUT remains connected to VCCuntil VCCdrops below VBATT. The VCC-to-VBATT comparator
has a small 25mV typical hysteresis to prevent oscillation. For VCC< 1.75V (typ), VOUTswitches to VBATT regardless of the
voltage on VBATT.
Note 6: When VBATT > VCC> VSW, VOUT remains connected to VCCuntil VCCdrops below the battery switch threshold (VSW).
Note 7:VOUTswitches from VBATT to VCCwhen VCCrises above the reset threshold, independent of VBATT. Switchover back to
VCCoccurs at the exact voltage that causes –R—E—S—E—T–to go high (on the MAX804_/805_, RESET goes low); however
switchover occurs 200ms prior to reset.
Note 8:The reset threshold tolerance is wider for VCCrising than for VCCfalling to accommodate the 10mV typical hysteresis, which
prevents internal oscillation.
Note 9:The leakage current into or out of the RESET pin is tested with RESET asserted (RESET output high impedance).
ELECTRICAL CHARACTERISTICS (continued)(VCC= 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T, VCC= 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S, VCC= 2.72V to
5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; TA= TMINto TMAX; unless otherwise noted. Typical values are at TA= +25˚C.)
MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R
3.0V/3.3V Microprocessor Supervisory Circuits
_______________________________________________________________________________________5VCC-to-VOUT ON-RESISTANCE
vs. TEMPERATUREMAX690-806 TOC01
TEMPERATURE (°C)
-to-V
OUT
ON-RESISTANCE (100–4008040120
VBATT-to-VOUT ON-RESISTANCE
vs. TEMPERATURE
MAX690-806 TOC02
TEMPERATURE (°C)
VBATT-to-V
OUT
ON-RESISTANCE (100–4008040120
SUPPLY CURRENT
vs. TEMPERATURE
MAX690-806 TOC03
TEMPERATURE (°C)
SUPPLY CURRENT (100–4008040120
10,000
BATTERY SUPPLY CURRENT
vs. TEMPERATURE
1000MAX690-806 TOC04
TEMPERATURE (°C)
BATTERY SUPPLY CURRENT (nA)100–4008040120
PFI THRESHOLD
vs. TEMPERATURE
1.238MAX690-806 TOC07
TEMPERATURE (°C)
PFI THRESHOLD (V)100–4008040120
RESET TIMEOUT PERIOD
vs. TEMPERATURE
212MAX690-806 TOC05
TEMPERATURE (°C)
RESET TIMEOUT PERIOD (ms)100–4008040120
RESET-COMPARATOR PROPAGATION
DELAY vs. TEMPERATUREMAX690-806 TOC06
TEMPERATURE (°C)
PROPAGATION DELAY (100–4008040120
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
1.002MAX690-806 TOC08
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD (V)100–4008040120
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R
_______________Detailed Description
Reset OutputA microprocessor’s (µP’s) reset input starts the µP in a
known state. These µP supervisory circuits assert reset to
prevent code execution errors during power-up, power-
down, brownout conditions, or a watchdog timeout.–R—E—S—E—T– is guaranteed to be a logic low for 0V < VCC<
VRST, provided that VBATT is greater than 1V. Without
a backup battery,–R—E—S—E—T– is guaranteed valid for VCC
> 1V. Once VCCexceeds the reset threshold, an
internal timer keeps–R—E—S—E—T– low for the reset timeout
period; after this interval,–R—E—S—E—T– goes high (Figure 2).
If a brownout condition occurs (VCCdips below the
reset threshold),–R—E—S—E—T– goes low. Each time–R—E—S—E—T–
is asserted, it stays low for the reset timeout period.
Any time VCCgoes below the reset threshold, the
internal timer restarts.
The watchdog timer can also initiate a reset. See the
Watchdog Inputsection.
The MAX804_/MAX805_ active-high RESET output is
open drain, and the inverse of the MAX690_/MAX704_/
MAX802_/MAX806_–R—E—S—E—T– output.
Reset ThresholdThe MAX690T/MAX704T/MAX805T are intended for
3.3V systems with a ±5% power-supply tolerance and a
10% system tolerance. Except for watchdog faults,
reset will not assert as long as the power supply
remains above 3.15V (3.3V - 5%). Reset is guaranteed
to assert before the power supply falls below 3.0V.
The MAX690S/MAX704S/MAX805S are designed for
3.3V ±10% power supplies. Except for watchdog
faults, they are guaranteed not to assert reset as long
as the supply remains above 3.0V (3.3V - 10%). Reset
is guaranteed to assert before the power supply falls
below 2.85V (VCC- 14%).
The MAX690R/MAX704R/MAX805R are optimized for
monitoring 3.0V ±10% power supplies. Reset will not
occur until VCCfalls below 2.7V (3.0V - 10%), but is
guaranteed to occur before the supply falls below
2.59V (3.0V - 14%).
The MAX802R/S/T, MAX804R/S/T, and MAX806R/S/T
are respectively similar to the MAX690R/S/T,
MAX805R/S/T, and MAX704R/S/T, but with tightened
reset and power-fail threshold tolerances.
3.0V/3.3V Microprocessor Supervisory Circuits_______________________________________________________________________________________
______________________________________________________________Pin Description
