MAX808LESA+ ,8-Pin µP Supervisory Circuits with ±1.5% Reset AccuracyApplications♦ Power Switching:250mA in V ModeCCComputers20mA in Battery-Backup ModeControllers♦ Max ..
MAX808MCSA ,Supervisory circuit with +-1.5% reset accuracy. Reset threshold(typ) 4.425V. CMOS RAM write protection..ELECTRICAL CHARACTERISTICS(V = 4.6V to 5.5V for the MAX80_L, V = 4.5V to 5.5V for the MAX80_N, V = ..
MAX808MCSA ,Supervisory circuit with +-1.5% reset accuracy. Reset threshold(typ) 4.425V. CMOS RAM write protection..features include a watch-' RESET Output (MAX808)dog for the MAX801 and CMOS RAM write protectionRES ..
MAX808MCSA ,Supervisory circuit with +-1.5% reset accuracy. Reset threshold(typ) 4.425V. CMOS RAM write protection..features include a watch-' RESET Output (MAX808)dog for the MAX801 and CMOS RAM write protectionRES ..
MAX808MEPA ,Supervisory circuit with +-1.5% reset accuracy. Reset threshold(typ) 4.425V. CMOS RAM write protection..General Description ________
MAX808NCSA ,Supervisory circuit with +-1.5% reset accuracy. Reset threshold(typ) 4.575V. CMOS RAM write protection..Applications' Power Switching:250mA in V ModeCCComputers20mA in Battery-Backup ModeControllers' Max ..
MB71A38-25 , PROGRAMMABLE SCHOTTKY 16384-BIT READ ONLY MEMORY
MB8117800A-60 ,2 M X 8 BIT FAST PAGE MODE DYNAMIC RAMapplications where very low power dissipation and high bandwidth are basic requirements of the desi ..
MB81464- ,MOS 262144 Bit DRAMfeatures page mode which allows high speed
random access of up to 256 bits within the same tow.
..
MAX808LCSA+-MAX808LESA+-MAX808NCSA+
8-Pin µP Supervisory Circuits with ±1.5% Reset Accuracy
_______________General DescriptionThe MAX801/MAX808 microprocessor (µP) supervisory
circuits monitor and control the activities of +5V µPs by
providing backup-battery switchover, low-line indica-
tion, and µP reset. Additional features include a watch-
dog for the MAX801 and CMOS RAM write protection
for the MAX808.
The MAX801/MAX808 offer a choice of reset-threshold
voltage (denoted by suffix letter): 4.675V (L), 4.575V
(N), and 4.425V (M). These devices are available in
8-pin DIP and SO packages.
________________________ApplicationsComputers
Controllers
Intelligent Instruments
Critical µP Power Monitoring
Portable/Battery-Powered Equipment
Embedded Systems
____________________________FeaturesPrecision Voltage Monitoring, ±1.5% Reset
Accuracy200ms Power-OK/Reset Time DelayRESET Output (MAX808)
RESET and RESET Outputs (MAX801)Watchdog Timer (MAX801)On-Board Gating of Chip-Enable Signals (MAX808):
Memory Write-Cycle Completion
3ns CE Gate Propagation Delay1µA Standby CurrentPower Switching:
250mA in VCCMode
20mA in Battery-Backup ModeMaxCap™/SuperCap™CompatibleRESET Guaranteed Valid to VCC= 1VLow-Line Threshold 52mV Above Reset
Threshold
MAX801L/M/N, MAX808L/M/N
8-Pin µP Supervisory Circuits
with ±1.5% Reset Accuracy0.1μF0.1μF
0.1μF
POWER
POWER FOR
CMOS RAM
NMIBATT
VCCOUT
+5V
GND
RESET
FROM I/O SYSTEM OR
ADDRESS DECODER
TO CMOS RAM
CE IN
CE OUT
LOWLINE
RESET
MAX808
µP SYSTEM
__________Typical Operating Circuit19-1086; Rev 1; 11/05
PART*
MAX801_CPAMAX801_CSA
MAX801_EPA-40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP RANGEPIN-PACKAGE8 Plastic DIP
8 SO
8 Plastic DIP
______________Ordering InformationMaxCap is a trademark of The Carborundum Corp.
SuperCap is a trademark of Baknor Industries.
Pin Configurations appear at end of data sheet.MAX801_ESA
MAX801_MJA
MAX808_CPA0°C to +70°C
-55°C to +125°C
-40°C to +85°C8 SO
8 CERDIP**
8 Plastic DIP
MAX808_CSA0°C to +70°C8 SO
MAX808_EPA
MAX808_ESA
MAX808_MJA-55°C to +125°C
-40°C to +85°C
-40°C to +85°C8 Plastic DIP
8 SO
8 CERDIP**
*These parts offer a choice of reset threshold voltage. From the
table below, select the suffix corresponding to the desired thresh-
old and insert it into the blank to complete the part number.
**Contact factory for availability and processing to MIL-STD-883.
Devices in PDIP, SO and µMAX 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.
RESET THRESHOLD (V)4.604.6754.50
MINMAXSUFFIXTYP
MAX801L/M/N, MAX808L/M/N
8-Pin µP Supervisory Circuits
with ±1.5% Reset Accuracy
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= 4.6V to 5.5V for the MAX80_L, VCC= 4.5V to 5.5V for the MAX80_N, VCC= 4.35V to 5.5V for the MAX80_M; VBATT= 2.8V;= TMINto TMAX. Typical values are at VCC= 5V and TA= +25°C, unless otherwise noted.)
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.
Input Voltage (with respect to GND)
VCC.......................................................................-0.3V to +6V
VBATT....................................................................-0.3V to +6V
All Other Pins........................................-0.3V to (VOUT+ 0.3V)
Input Current
VCCPeak..........................................................................1.0A
VCCContinuous............................................................500mA
IBATTPeak.....................................................................250mA
IBATTContinuous............................................................50mA
GND................................................................................50mA
All Other Inputs...............................................................50mA
Output Current
OUT Peak..........................................................................1.0A
OUT Continuous............................................................500mA
All Other Outputs............................................................50mA
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
MAX801_C_A/MAX808_C_A...............................0°C to +70°C
MAX801_E_A/MAX808_E_A............................-40°C to +85°C
MAX801_MJA/MAX808_MJA.........................-55°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX808
MAX801
VCC= 0V,
VBATT= 2.8V
CONDITIONS90
Supply Current in Normal
Operating Mode
(excludes IOUT)1100X5.5Operating Voltage Range
VCC, BATT (Note 1)
0.41µA
Supply Current in Battery-
Backup Mode (excludes
IOUT) (Note 2)
UNITSMINTYPMAXSYMBOLPARAMETERIOUT= 25mAVCC- 0.02
IOUT= 250mA, MAX80_C/E
IOUT= 250mA, MAX80_MVCC- 0.45
VCC= 4.5VVCC- 0.38VCC- 0.25
VCC= 3V, VBATT= 2.8V, IOUT= 100mA
VCC- 0.25VCC- 0.12
VOUTin Normal Operating
Mode
VCC= 3V, IOUT= 100mA
VCCto OUT
On-Resistance
VBATT= 2.8V, IOUT= 10mAVBATT- 0.25 VBATT- 0.12
VBATT= 4.5V, IOUT= 20mAVBATT- 0.16
VBATT= 2.0V, IOUT= 5mA
VCC= 0VV
VBATT- 0.20 VBATT- 0.08
VOUTin Battery-Backup
Mode
VBATT= 2.8V, IOUT= 10mA1225
VBATT= 4.5V, IOUT= 20mA8
VBATT= 2.0V, IOUT= 5mA
VCC= 0VΩ40
BATT to OUT
On-Resistance= +25°C= TMIN
to TMAX
MAX80_C/E
MAX80_M= +25°C= TMINto TMAX
VBATT+ 0.2VVCC
-1.01.0µABATT Standby Current
(Note 3)
Power-up
Power-downVBATT= 2.8VVBATT+ 0.05
VBATTVBattery-Switchover
ThresholdmVBattery-Switchover
Hysteresis
MAX80_C/EVCC= 4.5V,
IOUT= 250mAMAX80_M
MAX801L/M/N, MAX808L/M/N
8-Pin µP Supervisory Circuits
with ±1.5% Reset Accuracy
ELECTRICAL CHARACTERISTICS (continued)(VCC= 4.6V to 5.5V for the MAX80_L, VCC= 4.5V to 5.5V for the MAX80_N, VCC= 4.35V to 5.5V for the MAX80_M; VBATT= 2.8V; = TMINto TMAX. Typical values are at VCC= 5V and TA= +25°C, unless otherwise noted.)
VCCrising
and falling
VCCrising
VCCfalling at 1mV/µs
ISINK= 50µA,
VBATT= 0V,
VCCfalling
VCCfalling at 1mV/µs
MAX80_M
VCCfalling
MAX80_L
MAX80_N
CONDITIONSRESETOutput Voltage0.3
VRSTReset Threshold140200280tRPRESETActive Timeout
Period17tLLVCCto LOWLINEDelay17tRDVCCto RESETDelay
VLLLOWLINEThreshold,
VCCRising13Reset-Threshold Hysteresis305270VLRLOWLINEto RESET
Threshold Voltage
UNITSMINTYPMAXSYMBOLPARAMETER
MAX80_L
MAX80_N4.5004.5754.650
MAX80_M
ISOURCE= 0.1mAVCC- 1.5VCC- 0.1
ISINK= 3.2mA
ISOURCE= 5mA, VCC= 4.25V
0.4VVCC- 1.5
RESET Output Voltage
(MAX801)
Output sink current
Output source current, VCC= 4.25V
ISINK= 3.2mA, VCC= 4.25V
ISOURCE= 5mA, VCC= 4.25V
0.4VVCC- 1.5LOWLINEOutput VoltagemA15ISCRESET Output Short-
Circuit Current (MAX801)
Output sink current, VCC= 4.25V
Output source currentmA20ISCLOWLINEOutput
Short-Circuit Current
VCC= 1.0V, MAX80_C
VCC= 1.2V, MAX80_E/M
ISINK= 3.2mA, VCC= 4.25V
Output sink current, VCC= 4.25V
Output source currentmA1.6ISCRESETOutput
Short-Circuit Current
1.121.62.24sec
0.75 x VCC
tWDWatchdog Timeout Period
VIHV
RESET deasserted, WDI = 0V
VIL
WDI Threshold Voltage
(Note 4)RESET deasserted, WDI = VCC1650WDI Input Current
VIL= 0.8V, VIH= 0.75V x VCC100nsMinimum Watchdog Input
Pulse Width
RESET AND LOW-LINE
WATCHDOG TIMER (MAX801)
VCC SUPPLY CURRENT vs. TEMPERATURE
(NORMAL OPERATING MODE)
MAX801/808-01
TEMPERATURE (°C)
SUPPLY CURRENT (105-3545125585
MAX808
MAX801
BATTERY SUPPLY CURRENT vs.
TEMPERATURE (BATTERY-BACKUP MODE)
MAX801/808-02
TEMPERATURE (°C)
BATTERY SUPPLY CURRENT (100-4040120080
MAX808
CHIP-ENABLE PROPAGATION DELAY
vs. TEMPERATURE
MAX801/808-03
TEMPERATURE (°C)
PROPAGATION DELAY (ns)100-4040120080
MAX801L/M/N, MAX808L/M/N
8-Pin µP Supervisory Circuits
with ±1.5% Reset Accuracy
Note 1:Either VCCor VBATTcan go to 0V if the other is greater than 2V.
Note 2:The supply current drawn by the MAX80_ from the battery (excluding IOUT) typically goes to 15µA when (VBATT- 0.1V) <
VCC< VBATT. In most applications, this is a brief period as VCCfalls through this region (see Typical Operating
Characteristics).
Note 3:“+” = battery-discharging current, “-” = battery-charging current.
Note 4:WDI is internally connected to a voltage divider between VCCand GND. If unconnected, WDI is typically driven to 1.8V,
disabling the watchdog function.
Note 5:The chip-enable resistance is tested with VCEIN= VCC / 2 and ICEIN= 1mA.
Note 6:The chip-enable propagation delay is measured from the 50% point at CEIN to the 50% point at CEOUT.
Note 7:If CEIN goes high, CEOUT goes high immediately and stays high until reset is deasserted and CEIN is low.
ELECTRICAL CHARACTERISTICS (continued)(VCC= 4.6V to 5.5V for the MAX80_L, VCC= 4.5V to 5.5V for the MAX80_N, VCC= 4.35V to 5.5V for the MAX80_M; VBATT= 2.8V; = TMINto TMAX. Typical values are at VCC= 5V and TA= +25°C, unless otherwise noted.)
CONDITIONSEnabled mode, VCC= VRST(max)Ω75150CEIN to CEOUT
Resistance (Note 5)
UNITSMINTYPMAXSYMBOLPARAMETERVCC= 4.25V, CEOUT = 0VmA15CEOUT Short-Circuit
Current (RESETActive)
VCC= 5V, CLOAD= 50pF,
50Ωsource-impedance driverns38CEIN to CEOUT
Propagation Delay (Note 6)
VCC= 4.25V, IOUT= 2mAV3.5CEOUT Output Voltage
High (RESETActive)
VCCfalling, CEIN = 0Vµs18RESETto CEOUT Delay
(Note 7)
VCC = 4.25V±0.00002±1µACEIN Leakage Current
VCC= 0V, IOUT= 10µAVBATT- 0.1VBATT
CHIP-ENABLE GATING (MAX808)CHIP-ENABLE GATING (MAX808)
__________________________________________Typical Operating Characteristics(VCC= 5V, VBATT= 2.8V, no load, TA= +25°C, unless otherwise noted.)
MAX801L/M/N, MAX808L/M/N
8-Pin µP Supervisory Circuits
with ±1.5% Reset Accuracy50Ω DRIVER50100
MAX808
CHIP-ENABLE PROPAGATION DELAY
vs. CE OUT LOAD CAPACITANCEMAX801/808-04
CLOAD (pF)
PROPAGATION DELAY (ns)
RESET THRESHOLD
vs. TEMPERATURE
MAX801/808-07
TEMPERATURE (°C)
RESET THRESHOLD (V)100-4040120080
MAX80_L
MAX80_N
MAX80_M
BATT to OUT ON-RESISTANCE
vs. TEMPERATURE
MAX801/808-05
TEMPERATURE (°C)
BATT
TO V
OUT
ON-RESISTANCE (100-4040120080
VBATT = 2.0V
VBATT = 2.8V
VBATT = 4.5V
VCC = 0V
IOUT = 10mA
VCC to OUT ON-RESISTANCE
vs. TEMPERATURE
MAX801/808-06
TEMPERATURE (°C)
CC
TO V
OUT
ON-RESISTANCE (100-4040120080
IOUT = 250mA
RESET TIMEOUT PERIOD
vs. TEMPERATURE (VCC RISING)
MAX801/808-08
TEMPERATURE (°C)
RESET TIMEOUT PERIOD (ms)100-4040120080
LOWLINE to RESET THRESHOLD
vs. TEMPERATURE (VCC FALLING)
MAX801/808-09
TEMPERATURE (°C)
LOWLINE TO RESET THRESHOLD (mV)100-4040120080
____________________________Typical Operating Characteristics (continued)(VCC= 5V, VBATT= 2.8V, no load, TA= +25°C, unless otherwise noted.)
4.40
LOWLINE THRESHOLD
vs. TEMPERATURE (VCC RISING)
MAX801/808-10
TEMPERATURE (°C)
LOWLINE THRESHOLD (V)100-4040120080
MAX80_L
MAX80_N
MAX80_M
LOWLINE COMPARATOR PROPAGATION
DELAY vs. TEMPERATURE (VCC FALLING)
MAX801/808-11
TEMPERATURE (°C)
PROPAGATION DELAY (100-4040120080
VCC FALLING AT 1mV/µs
RESET COMPARATOR PROPAGATION
DELAY vs. TEMPERATURE (VCC FALLING)
MAX801/808-12
TEMPERATURE (°C)
PROPAGATION DELAY (100-4040120080
VCC FALLING AT 1mV/µs
MAX801L/M/N, MAX808L/M/N
8-Pin µP Supervisory Circuits
with ±1.5% Reset AccuracyBATTERY CURRENT
vs. INPUT SUPPLY VOLTAGE
MAX801/808-13
VCC (V)
BATTERY CURRENT (
VCC to OUT VOLTAGE vs.
OUTPUT CURRENT
MAX801/808-15
IOUT (mA)
TO V
OUT
VOLTAGE (mV)
SLOPE = 1.0Ω
BATT to OUT VOLTAGE vs.
OUTPUT CURRENT
MAX801/808-14
IOUT (mA)
BATT
TO V
OUT
VOLTAGE (mV)
VCC = 0V
SLOPE = 12Ω
MAXIMUM TRANSIENT DURATION vs.
RESET THRESHOLD OVERDRIVE
MAX801/808-16
RESET THRESHOLD OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (
RESET OCCURS
____________________________Typical Operating Characteristics (continued)(VCC= 5V, VBATT= 2.8V, no load, TA= +25°C, unless otherwise noted.)
______________________________________________________________Pin DescriptionRESET
LOWLINE
VCC
Active-Low Reset Output. RESETis triggered and stays low when VCCis below the reset
threshold (or during a watchdog timeout for the MAX801). It remains low 200ms after
VCCrises above the reset threshold (or 200ms after the watchdog timeout occurs).
RESEThas a strong pull-down but a relatively weak pull-up, and can be wire-OR con-
nected to logic gates. Valid for VCC≥1V. RESETswings between VCCand GND.3
NAMELow-Line Comparator Output. This CMOS-logic output goes low when VCCfalls to 52mV
above the reset threshold. Use LOWLINEto generate an NMI, initiating an orderly shut-
down routine when VCCis falling. LOWLINEswings between VCCand GND.2
Input Supply Voltage, nominally +5V. Bypass with a 0.1µF capacitor to GND.11
MAX801MAX808FUNCTIONPINGNDGround44
