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19-0486; Rev 2; 2/00
MAX817L/M, MAX818L/M, MAX819L/M*
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x x x x x x x x x
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PART TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C PIN-PACKAGE 8 Plastic DIP 8 SO 8 MAX
_____________________________
MAX817 L/M -- -- MAX818 L/M -- -- MAX819 L/M -- --
MAX817_CPA MAX817_CSA MAX817_CUA
Ordering InforMation continued on last page. These parts offer a choice of reset threshold voltage. FroM the table below, select the suffix corresponding to the desired threshold and insert it into the blank to coMplete the part nuMber.
SUFFIX L M
RESET THRESHOLD (V) 4.65 4.40
8-DIP/SOP/ 8-DIP/SOP/ 8-DIP/SOP/ MAX MAX MAX MAX690A/ MAX692A -- MAX703/ MAX704 TOP VIEW
_______________________________
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OUT 1 VCC 2 GND 3
8
BATT RESET WDI PFO
MAX817
7 6 5
PFI 4
DIP/SO/MAX * Pin Configurations continued at end of data sheet. ________________________________________________________________ MaxiM Integrated Products 1
MAX817L/M, MAX818L/M, MAX819L/M*
ABSOLUTE MAXIMUM RATINGS
Input Voltage VCC, BATT ..........................................................-0.3V to +6.0V All Other Pins (Note 1).............................-0.3V to (VCC + 0.3V) Input Current VCC Peak ..............................................................................1A VCC Continuous .............................................................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 = +70C) Plastic DIP (derate 9.09MW/C above +70C) .............727MW SO (derate 5.88MW/C above +70C) ..........................471MW MAX (derate 4.10MW/C above +70C) .....................330MW Operating TeMperature Ranges MAX81_ _C_A ......................................................0C to +70C MAX81_ _E_A ...................................................-40C to +85C Storage TeMperature Range .............................-65C to +160C Lead TeMperature (soldering, 10sec) .............................+300C
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.
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.
ELECTRICAL CHARACTERISTICS
(VCC = +4.75V to +5.5V for MAX81_L, VCC = +4.5V to +5.5V for MAX81_M, VBATT = 2.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Operating Voltage Range, VCC, VBATT (Note 2) Supply Current (excluding IOUT) Supply Current in BatteryBackup Mode (excluding IOUT) ISUPPLY As applicable; CE IN = 0V, WDI and MR unconnected VCC = 0V MAX81_ _C MAX81_ _E TA = +25C TA = TMIN to TMAX TA = +25C BATT Standby Current (Note 3) BATT Leakage Current, Freshness Seal Enabled 5.5V > VCC > (VBATT + 0.2V) TA = TMIN to TMAX -0.10 -1.00 SYMBOL CONDITIONS MIN 0 11 11 0.05 TYP MAX 5.5 45 60 1.0 5.0 0.02 0.02 1 VCC 0.05 VCC 0.5 VCC 0.025 VCC 0.25 5 100 IOUT = 250A, VCC < (VBATT - 0.2V) VCC < VRST Power-up Power-down VBATT - VBATT 0.1 0.02 20 -20 40 10 A A UNITS V A
VCC = 0V, VOUT = 0V IOUT = 5MA
A
VOUT Output IOUT = 50MA VCC to OUT On-Resistance BATT to OUT On-Resistance VOUT in Battery-Backup Mode Battery Switch Threshold (VCC - VBATT) Battery Switchover Hysteresis
V
V MV MV
2
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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 = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL MAX81_L MAX81_M CONDITIONS MIN 4.50 4.25 140 VCC > VRST(MAX), ISOURCE = 800A VCC < VRST(MIN), ISINK = 3.2MA RESET Output Voltage VOL MAX81_ _C, VCC = 1V, VCC falling, VBATT = 0V, ISINK = 50A MAX81_ _E, VCC = 1.2V, VCC falling, VBATT = 0V, ISINK = 100A VCC to RESET Delay Watchdog TiMeout Period WDI Pulse Width WDI Input Threshold (Note 4) WDI Input Current (Note 5) tWD tWDI VIL VIH VIL = 0.4V, VIH = 0.8VCC VCC = 5V WDI = VCC, tiMe average WDI = GND, tiMe average VPFT IPFI VOL VOH VPFI < 1.20V, ISINK = 3.2MA, VCC > 4.50V VPFI > 1.30V, ISOURCE = 40A, VCC > 4.5V V P FO = 0V VIL VIH 1 100 120 45 63 85 0.8 2.0 VCC - 1.5 250 500 -20 1.20 -25 FroM VRST, VCC falling at 10V/Ms 1.00 50 0.8 3.5 120 -15 1.25 4 0.01 25 0.4 1.30 160 100 1.60 2.25 VCC - 1.5 0.4 0.3 0.3 s sec ns V A V TYP 4.65 4.40 25 tRP VOH 200 280 MAX 4.75 4.50 UNITS RESET AND WATCHDOG TIMER Reset Threshold Reset Threshold Hysteresis Reset TiMeout Period VRST V MV Ms
MAX817L/M, MAX818L/M, MAX819L/M*
POWER-FAIL COMPARATOR (MAX817/MAX819 only) PFI Input Threshold PFI Input Hysteresis PFI Input Current PFO Output Voltage PFO Short-Circuit Current MANUAL RESET INPUT (MAX819 only) MR Input Threshold MR Pulse Width MR Pulse that Would Not Cause a Reset MR to Reset Delay MR Pull-Up Resistance V s ns ns k V MV nA V A
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3
MAX817L/M, MAX818L/M, MAX819L/M*
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 = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER CE IN Leakage Current CE IN to CE OUT Resistance (Note 6) CE OUT Short-Circuit Current (Reset Active) CE IN to CE OUT Propagation Delay (Note 7) CE OUT Output CE OUT Input Threshold RESET to CE OUT Delay Note 2: Note 3: Note 4: Note 5: VOH VIH VIL SYMBOL Disable Mode Enable Mode Disable Mode, CE OUT = 0V 50 source iMpedance driver, CLOAD = 50pF IOUT = -100A, VCC = 0V IOUT = -1A, VCC = 0V, VBATT = 2.8V VCC = 5V Power-down VCC - 1V 2.7 0.8 3.5 15 0.1 CONDITIONS MIN TYP 0.005 40 0.75 3 MAX 1 150 2.0 8 UNITS A MA ns V V s CHIP-ENABLE GATING (MAX818 only)
Either VCC or VBATT can go to 0V if the other is greater than 2.0V. "-" = battery-charging current, "+" = battery-discharging current. WDI is internally serviced within the watchdog tiMeout period if WDI is left unconnected. 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 10A and a MaxiMuM output capacitance of 200pF. The output device Must also be able to source and sink at least 200A when active. Note 6: The chip-enable resistance is tested with VCC = +4.75V for the MAX818L and VCC = +4.5V for the MAX818M. V C E IN = V C E OUT = VCC/2. Note 7: The chip-enable propagation delay is Measured froM the 50% point at CE IN to the 50% point at CE OUT.
4
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MAX817L/M, MAX818L/M, MAX819L/M*
______________________________________________________________________
(VCC = +5V, VBATT = 3.0V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE (NO LOAD)
MAX817/18/19-01
BATTERY SUPPLY CURRENT (BACKUP MODE) vs. TEMPERATURE
CE IN TO CE OUT ON-RESISTANCE () 140 120 100 80 60 40 20 0 VBATT = 2.8V VBATT = 2.0V VCC = 0V VBATT = 5.0V
MAX817/18/19-02
CE IN TO CE OUT ON-RESISTANCE vs. TEMPERATURE
90 80 70 60 50 40 30 20 10 0 -40 -20 0 20 40 60 80 100 VCE IN = 3V VCE IN = 2V
MAX817/18/19-03
16
160 BATTERY SUPPLY CURRENT (nA)
100 VCE IN = 4V
SUPPLY CURRENT (A)
14
12
10
8 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
TEMPERATURE (C)
BATT TO OUT ON-RESISTANCE vs. TEMPERATURE
MAX817/18/19-04
VCC TO OUT ON-RESISTANCE vs. TEMPERATURE
MAX817/18/19-05
RESET TIMEOUT PERIOD vs. TEMPERATURE
MAX817/18/19-06
300 BATT TO OUT ON-RESISTANCE () 250 200 150 100 50 0 -40
VCC = 0V
7 VCC TO OUT ON-RESISTANCE ()
220 RESET TIMEOUT PERIOD (Ms)
VBATT = 2.0V
6
210
VBATT = 2.8V VBATT = 5.0V
5
200
4
190
3 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) TEMPERATURE (C)
180 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
VCC TO RESET PROPAGATION DELAY vs. TEMPERATURE
MAX817/18/19-07
WATCHDOG TIMEOUT PERIOD vs. TEMPERATURE
WATCHDOG TIMEOUT PERIOD (sec)
MAX817/18/19-08
BATTERY FRESHNESS SEAL LEAKAGE CURRENT vs. TEMPERATURE
MAX817/18/19-09
VCC TO RESET PROPAGATION DELAY (Ms)
500 VCC FALLING AT: 0.25V/Ms 400
1.70
20
LEAKAGE CURRENT (nA)
1.65
15
300 1V/Ms 200 10V/Ms 100
1.60
10
1.55
5
0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
1.50 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
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5
MAX817L/M, MAX818L/M, MAX819L/M*
_________________________________________________________________
(VCC = +5V, VBATT = 3.0V, TA = +25C, unless otherwise noted.)
RESET THRESHOLD vs. TEMPERATURE
MAX817/18/19-10
MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE
MAX817/18/19-11
BATTERY SUPPLY CURRENT vs. SUPPLY VOLTAGE
7 6 5 4 3 2 1 0
MAX817/18/19-12
4.7 MAX81_L 4.6
1600 MAXIMUM TRANSIENT DURATION (s) 1400 1200 1000 800 600 400 200 0 RESET OCCURS ABOVE CURVE
8 BATTERY SUPPLY CURRENT (A)
RESET THRESHOLD (V)
4.5
4.4
MAX81_M
4.3 -40
-20
0
20
40
60
80
1
10
100
1000
10,000
0
1
2
3 VCC (V)
4
5
6
TEMPERATURE (C)
RESET COMPARATOR OVERDRIVE, VTH-VCC (MV)
CE IN TO CE OUT PROPAGATION DELAY vs. TEMPERATURE
CE IN TO CE OUT PROPAGATION DELAY (ns)
MAX817/18/19-13
MAX817/MAX819 PFI THRESHOLD vs. TEMPERATURE
MAX817/18/19-14
MAX817/MAX819 PFI TO PFO PROPAGATION DELAY vs. TEMPERATURE
MAX817/18/19-15
7 6 5 4 3 tPD+ 2 1 0 -40 -20 0 20 40 60 80 tPD-
1.254 1.252 1.250 1.248 1.246 1.244 1.242 1.240
33
PROPAGATION DELAY (s)
32
THRESHOLD (V)
31
30
29
28 -40 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) TEMPERATURE (C)
100
TEMPERATURE (C)
6
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MAX817L/M, MAX818L/M, MAX819L/M*
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MAX817 1 2 3 4
MAX818 1 2 3 --
MAX819 1 2 3 4 OUT VCC GND PFI PFO PFO
--
4
--
CE IN
5
--
5
PFO
PFO
PFO
PFO
CE -- 5 -- CE OUT CE CE CE CE CE CE
6
6
--
WDI
--
--
6
MR
MR
MR MR
7
7
7
RESET MR
MR
8
8
8
BATT
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7
MAX817L/M, MAX818L/M, MAX819L/M*
BATT
BATTERY SWITCHOVER CIRCUITRY
OUT
VCC
MAX817 MAX818 MAX819
RESET GENERATOR
RESET
1.25V THIS PIN FOR MAX819 ONLY.
MR WATCHDOG TIMER BATTERY FRESHNESS SEAL CIRCUITRY
WDI THIS SECTION FOR MAX817/ MAX818 ONLY.
THIS SECTION PFI FOR MAX817/ MAX819 ONLY.
PFO
1.25V
CHIP-ENABLE OUTPUT CONTROL
THIS SECTION FOR MAX818 ONLY. CE IN CE OUT
GND
8
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MAX817L/M, MAX818L/M, MAX819L/M*
___________________________________
MR MR MR MR
RESET
MR RESET RESET MR
MR MR
RESET RESET RESET RESET PFO RESET
PFO
CE
MR MR
VBATT VRST VCC VOUT VRESET VPFO* VCE OUT** VBATT CE OUT FOLLOWS CE IN *MAX817/MAX819 ONLY. ** MAX818 ONLY. CE OUT (MAX818) (EXTERNALLY HELD AT 0V) PFO (MAX817/MAX819) (EXTERNALLY HELD AT 0V) VBATT tRP PFO FOLLOWS PFI RESET TO CE OUT DELAY** VRST VBATT VCC tRP CE OUT STATE LATCHED AT 1/2 tRP AND 3/4 tRP, FRESHNESS SEAL ENABLED PFO STATE LATCHED AT 1/2 tRP AND 3/4 tRP, FRESHNESS SEAL ENABLED VRST VRST
RESET
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9
MAX817L/M, MAX818L/M, MAX819L/M*
MR MR
VCC tRP RESET tWD

WDI
MAX817 MAX818
RESET GENERATOR
BATTERY SWITCHOVER CIRCUITRY
BATTERY FRESHNESS SEAL CIRCUITRY OUT
CHIP-ENABLE OUTPUT CONTROL P CE IN
CE OUT N
CE
CE
CE
CE CE
VRST VRST VRST VRST VCC
CE
VCE OUT
VBATT tRP
VBATT tRP
CE
VRESET VCE IN
15s
CE CE CE
10
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MAX817L/M, MAX818L/M, MAX819L/M*
PFO CE CE CE CE CE CE CE CE PFO PFO MR PFO PFO
PFO MR PFO MR CE CE PFO CE PFO MR MR MR
PFO
MR
+5V VCC BATT
VIN
+5V REGULATOR
POWER-FAIL-WARNING TRIP VOLTAGE R1 + R2 VWARN = 1.25 R2
(
)
MAX818
VCC
CE IN 50 50 GND
CE OUT
R1 PFI 50pF CL* R2
MAX817 MAX819
RESET
RESET
PFO
NMI
P
1.25V * CL INCLUDES LOAD CAPACITANCE, STRAY CAPACITANCE, AND SCOPE-PROBE CAPACITANCE.
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11
MAX817L/M, MAX818L/M, MAX819L/M*

___________________
SIGNAL VCC VOUT
STATUS Disconnected froM VOUT. Connected to VBATT through an internal 80 PMOS switch. Connected to VOUT. Current drawn froM the battery is less than 1A, as long as VCC < VBATT - 0.2V. Logic low Watchdog tiMer is disabled. Logic high. The open-circuit voltage is equal to VOUT. High iMpedance
MAX817 MAX818 MAX819 D3 BATT VCC
VBATT V R ESET VWDI V C E OUT V C E IN
SW1
SW2
D1
D2
SW3
SW4
SUBSTRATE
OUT V1 ADDITIONAL SUPPLY RESET VOLTAGE R1 + R2 V2 (RESET) = 1.25 R2
V2
VCC
(
)
CONDITION VCC > Reset Threshold
SW1/SW2 Open Open Closed
SW3/SW4 Closed Closed Open
R1 PFI R2
MAX819
RESET MR PFO P RESET
VCC < Reset Threshold and VCC > VBATT VCC < Reset Threshold and VCC < VBATT
RESET THRESHOLD = 4.65V IN MAX81_L RESET THRESHOLD = 4.4V IN MAX81_M
PFO
MR
12
______________________________________________________________________________________
MAX817L/M, MAX818L/M, MAX819L/M*
PFO
+5V
VIN R1 PFI R2
VCC
MAX817 MAX819
R3 C1* PFO GND
+5V VCC OUT MAX817 MAX818 MAX819 RESET TO STATIC RAM
+5V
TO P
*OPTIONAL
BATT
TO P
PFO 0V 0V VL VTRIP VIN VH
100k
0.1F GND
R2 VTRIP = 1.25V R1 + R2
(
)
1.25 R2
VH = 1.25V
( R1 + R2 || R3 )
R2 || R3
VL - 1.25 5 - 1.25 = + R1 R3
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13
MAX817L/M, MAX818L/M, MAX819L/M*
+5V R1 PFI VCC
PFO
MAX817 MAX819
PFO
R2
GND V+5V
PFO
PFO 0V
VTRIP
0V
V-
RESET RESET
5 - 1.25 1.25 - VTRIP = R1 R2 NOTE: VTRIP IS NEGATIVE
RESET RESET
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
VCC
VCC
MAX817 MAX818 MAX819
RESET
4.7k RESET
GND
GND

14
______________________________________________________________________________________
MAX817L/M, MAX818L/M, MAX819L/M*
START
SET WDI LOW SUBROUTINE OR PROGRAM LOOP, SET WDI HIGH
RETURN
END
___________________________
TOP VIEW
_______________________
+5V 0.1F CMOS RAM VCC BATT 0.1F
REALTIME CLOCK
OUT 1 VCC 2 GND 3
8
BATT RESET WDI CE OUT
MAX818
7 6 5
OUT CE IN 4 0.1F A0-A15 RESET P WDI** I/O ADDRESS DECODE OUT 1 VCC 2 GND 3 PFI 4 8 BATT RESET MR PFO
MAX817 MAX818 MAX819
RESET
DIP/SO/MAX
CE IN* CE OUT* GND
MAX819
7 6 5
*CE IN AND CE OUT APPLY TO MAX818 ONLY. **WDI APPLIES TO MAX817/MAX818 ONLY.
DIP/SO/MAX
______________________________________________________________________________________
15
MAX817L/M, MAX818L/M, MAX819L/M*
___________________________
PART MAX817_EPA MAX817_ESA MAX818_CPA MAX818_CSA MAX818_CUA MAX818_EPA MAX818_ESA MAX819_CPA MAX819_CSA MAX819_CUA MAX819_EPA MAX819_ESA TEMP. RANGE -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 MAX 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 MAX 8 Plastic DIP 8 SO
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TRANSISTOR COUNT: 719
These parts offer a choice of reset threshold voltage. FroM the table below, select the suffix corresponding to the desired threshold and insert it into the blank to coMplete the part nuMber.
SUFFIX L M
RESET THRESHOLD (V) 4.65 4.40
________________________________________________________________________
8LUMAXD.EPS
16 __________________MaxiM Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 2000 MaxiM Integrated Products is a registered tradeMark of MaxiM Integrated Products.

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