MAX817LCPA ,+5V microprocessor supervisory circuit. Reset threshold 4.65V, active-low reset, backup-battery switchover, power-fail comparator, watchdog input, battery freshness seal.FeaturesThe MAX817/MAX818/MAX819 microprocessor (µP) ' Precision Supply-Voltage Monitor:supervisory ..
MAX817LCSA ,+5V microprocessor supervisory circuit. Reset threshold 4.65V, active-low reset, backup-battery switchover, power-fail comparator, watchdog input, battery freshness seal.ELECTRICAL CHARACTERISTICS(V = +4.75V to +5.5V for MAX81_L, V = +4.5V to +5.5V for MAX81_M, V = 2.8 ..
MAX817LCSA ,+5V microprocessor supervisory circuit. Reset threshold 4.65V, active-low reset, backup-battery switchover, power-fail comparator, watchdog input, battery freshness seal.applications. The MAX817/MAX818/MAX819 are specif-(MAX817/MAX818)ically designed to ignore fast tra ..
MAX817LCSA+ ,+5V Microprocessor Supervisory CircuitsELECTRICAL CHARACTERISTICS(V = +4.75V to +5.5V for MAX81_L, V = +4.5V to +5.5V for MAX81_M, V = 2.8 ..
MAX817LCUA+ ,+5V Microprocessor Supervisory CircuitsFeaturesThe MAX817/MAX818/MAX819 microprocessor (µP) ♦ Precision Supply-Voltage Monitor:supervisory ..
MAX817LESA ,+5V Microprocessor Supervisory CircuitsMAX817L/M, MAX818L/M, MAX819L/M*19-0494; Rev 1; 3/96+5V Microprocessor Supervisory Circuits________ ..
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MB81C81A-35 ,CMOS 256K-BIT HIGH-SPEED SRAMMay 1990 00
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MAX817LCPA-MAX817LCSA-MAX817MCSA
+5V microprocessor supervisory circuit. Reset threshold 4.65V, active-low reset, backup-battery switchover, power-fail comparator, watchdog input, battery freshness seal.
_______________General DescriptionThe MAX817/MAX818/MAX819 microprocessor (µP)
supervisory circuits simplify power-supply monitoring,
battery control, and chip-enable gating in µP systems
by reducing the number of components required.
These devices are designed for use in +5V-powered
systems. Low supply current (11µA typical) and small
package size make these devices ideal for portable
applications. The MAX817/MAX818/MAX819 are specif-
ically designed to ignore fast transients on VCC. Other
supervisory functions include active-low reset, backup-
battery switchover, watchdog input, battery freshness
seal, and chip-enable gating. The Selector Guidebelow
lists the specific functions available from each device.
These devices offer two pretrimmed reset threshold volt-
ages for ±5% or ±10% power supplies: 4.65V for the L
versions and 4.40V for the M versions. The MAX817/
MAX818/MAX819 are available in space-saving µMAX
packages, as well as 8-pin DIP/SO.
________________________ApplicationsBattery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Critical µP Monitoring
Portable Equipment
____________________________FeaturesPrecision Supply-Voltage Monitor:
4.65V (MAX81_L)
4.40V (MAX81_M)11µA Quiescent Supply Current200ms Reset Time DelayWatchdog Timer with 1.6sec Timeout
(MAX817/MAX818)Battery-Backup Power Switching; Battery Voltage
Can Exceed VCCBattery Freshness SealOn-Board, 3ns Gating of Chip-Enable Signals
(MAX818)Uncommitted Voltage Monitor for Power-Fail or
Low-Battery Warning (MAX817/MAX819)Manual Reset Input (MAX819)
MAX817L/M, MAX818L/M, MAX819L/M*
+5V Microprocessor Supervisory Circuits
_________________Pin Configurations19-0494; Rev 1; 3/96*Patents Pending
MAX817L/M, MAX818L/M, MAX819L/M*
+5V Microprocessor Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +4.75V to +5.5V for MAX81_L, VCC= +4.5V to +5.5V for MAX81_M, VBATT= 2.8V, 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.
Note 1:The input voltage limits on PFI and WDI may be exceeded (up to 12V VIN) if the current into these pins is limited to less
than 10mA.
Input Voltage
VCC, BATT..........................................................-0.3V to +6.0V
All Other Pins (Note 1).............................-0.3V to (VCC+ 0.3V)
Input Current
VCCPeak..............................................................................1A
VCCContinuous.............................................................250mA
BATT Peak.....................................................................250mA
BATT Continuous.............................................................50mA
GND.................................................................................25mA
Output Current
OUT................................................................................250mA
All Other Outputs.............................................................25mA
OUT Short-Circuit Duration.................................................10sec
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
µMAX (derate 4.10mW/°C above +70°C).....................330mW
Operating Temperature Ranges
MAX81_ _C_A......................................................0°C to +70°C
MAX81_ _E_A...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
ELECTRICAL CHARACTERISTICS (continued)(VCC= +4.75V to +5.5V for MAX81_L, VCC= +4.5V to +5.5V for MAX81_M, VBATT= 2.8V, TA= TMINto TMAX, unless otherwise
noted. Typical values are at TA= +25°C.)
MAX817L/M, MAX818L/M, MAX819L/M*
+5V Microprocessor Supervisory Circuits
MAX817L/M, MAX818L/M, MAX819L/M*
+5V Microprocessor Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)(VCC= +4.75V to +5.5V for MAX81_L, VCC= +4.5V to +5.5V for MAX81_M, VBATT= 2.8V, TA= TMINto TMAX, unless otherwise
noted. Typical values are at TA= +25°C.)
Note 2:Either VCCor VBATTcan go to 0V if the other is greater than 2.0V.
Note 3:“-” = battery-charging current, “+” = battery-discharging current.
Note 4:WDI is internally serviced within the watchdog timeout period if WDI is left unconnected.
Note 5:WDI input is designed to be driven by a three-stated output device. To float WDI, the “high-impedance mode” of the output
device must have a maximum leakage current of 10µA and a maximum output capacitance of 200pF. The output device
must also be able to source and sink at least 200µA when active.
Note 6:The chip-enable resistance is tested with VCC= +4.75V for the MAX818L and VCC= +4.5V for the MAX818M.
VCEIN= VCEOUT= VCC/2.
Note 7:The chip-enable propagation delay is measured from the 50% point at CEIN to the 50% point at CEOUT.
MAX817L/M, MAX818L/M, MAX819L/M*
+5V Microprocessor Supervisory CircuitsSUPPLY CURRENT
vs. TEMPERATURE (NO LOAD)
MAX817/18/19-01
TEMPERATURE (°C)
SUPPLY CURRENT (
BATTERY SUPPLY CURRENT
(BACKUP MODE) vs. TEMPERATURE
MAX817/18/19-02
TEMPERATURE (°C)
BATTERY SUPPLY CURRENT (nA)
CE IN TO CE OUT ON-RESISTANCE
vs. TEMPERATURE
MAX817/18/19-03
TEMPERATURE (°C)
CE IN TO CE OUT ON-RESISTANCE (
BATT TO OUT ON-RESISTANCE
vs. TEMPERATURE
MAX817/18/19-04
TEMPERATURE (°C)
BATT TO OUT ON-RESISTANCE (
VCC TO RESET PROPAGATION DELAY
vs. TEMPERATURE
MAX817/18/19-07
TEMPERATURE (°C)
TO RESET PROPAGATION DELAY (ms)
VCC TO OUT ON-RESISTANCE
vs. TEMPERATURE
MAX817/18/19-05
TEMPERATURE (°C)
CC
TO OUT ON-RESISTANCE (
RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX817/18/19-06
TEMPERATURE (°C)
RESET TIMEOUT PERIOD (ms)
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
MAX817/18/19-08
TEMPERATURE (°C)
WATCHDOG TIMEOUT PERIOD (sec)
BATTERY FRESHNESS SEAL
LEAKAGE CURRENT vs. TEMPERATURE
MAX817/18/19-09
TEMPERATURE (°C)
LEAKAGE CURRENT (nA)
__________________________________________Typical Operating Characteristics
(VCC= +5V, VBATT= 3.0V, TA= +25°C, unless otherwise noted.)
MAX817L/M, MAX818L/M, MAX819L/M*
+5V Microprocessor Supervisory Circuits
BATTERY SUPPLY CURRENT
vs. SUPPLY VOLTAGEMAX817/18/19-12
VCC (V)
BATTERY SUPPLY CURRENT (356
CE IN TO CE OUT PROPAGATION DELAY
vs. TEMPERATURE
MAX817/18/19-13
TEMPERATURE (°C)
CE IN TO CE OUT PROPAGATION DELAY (ns)
MAX817/MAX819 PFI THRESHOLD
vs. TEMPERATURE
MAX817/18/19-14
TEMPERATURE (°C)
THRESHOLD (
RESET THRESHOLD
vs. TEMPERATURE
MAX817/18/19-10
TEMPERATURE (°C)
RESET THRESHOLD (V)
160010100100010,000
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVEMAX817/18/19-11
RESET COMPARATOR OVERDRIVE, VTH-VCC (mV)
MAXIMUM TRANSIENT DURATION (
MAX817/MAX819 PFI TO PFO PROPAGATION
DELAY vs. TEMPERATURE
MAX817/18/19-15
TEMPERATURE (°C)
PROPAGATION DELAY (
____________________________Typical Operating Characteristics (continued)
(VCC= +5V, VBATT= 3.0V, TA= +25°C, unless otherwise noted.)
MAX817L/M, MAX818L/M, MAX819L/M*
+5V Microprocessor Supervisory Circuits
______________________________________________________________Pin Description
MAX817L/M, MAX818L/M, MAX819L/M*
+5V Microprocessor Supervisory CircuitsFigure 1. Functional Diagram
