IC Phoenix
 
Home ›  MM79 > MAX817LCSA+-MAX817LCUA+-MAX817LESA+-MAX818LCPA+-MAX818LCSA+-MAX818LCSA+T-MAX818MCSA+-MAX818MCUA+-MAX818MEPA+-MAX819LCSA+-MAX819MCSA+-MAX819MESA+,+5V Microprocessor Supervisory Circuits
MAX817LCSA+-MAX817LCUA+-MAX817LESA+-MAX818LCPA+-MAX818LCSA+ Fast Delivery,Good Price
Part Number:
If you need More Quantity or Better Price,Welcom Any inquiry.
We available via phone +865332716050 Email
Partno Mfg Dc Qty AvailableDescript
MAX818MCUA+ |MAX818MCUAMAXIMN/a90avai+5V Microprocessor Supervisory Circuits
MAX818MEPA+ |MAX818MEPAMAXIMN/a5avai+5V Microprocessor Supervisory Circuits
MAX819LCSA+ |MAX819LCSAMAXIMN/a15avai+5V Microprocessor Supervisory Circuits
MAX817LCSA+ |MAX817LCSAMAXIMN/a55avai+5V Microprocessor Supervisory Circuits
MAX817LCUA+ |MAX817LCUAMAXIMN/a70avai+5V Microprocessor Supervisory Circuits
MAX817LESA+N/AN/a2500avai+5V Microprocessor Supervisory Circuits
MAX818LCPA+ |MAX818LCPAMAXN/a1450avai+5V Microprocessor Supervisory Circuits
MAX818LCSA+MAXIMN/a508avai+5V Microprocessor Supervisory Circuits
MAX818LCSA+T |MAX818LCSATMAXIMN/a2500avai+5V Microprocessor Supervisory Circuits
MAX818MCSA+ |MAX818MCSAMAXIMN/a45avai+5V Microprocessor Supervisory Circuits
MAX819MCSA+ |MAX819MCSAMAXIMN/a105avai+5V Microprocessor Supervisory Circuits
MAX819MESA+ |MAX819MESAMAXIMN/a8avai+5V Microprocessor Supervisory Circuits


MAX818LCSA+T ,+5V Microprocessor Supervisory CircuitsApplicationsTOP VIEWBattery-Powered Computers and ControllersEmbedded ControllersOUT 1 8 BATTIntell ..
MAX818LCUA ,+5V Microprocessor Supervisory CircuitsGeneral Description ________
MAX818LEPA ,+5V Microprocessor Supervisory CircuitsApplications TOP VIEWBattery-Powered Computers and ControllersEmbedded Controllers OUT 1 8 BATTInte ..
MAX818LESA ,+5V Microprocessor Supervisory CircuitsApplications TOP VIEWBattery-Powered Computers and ControllersEmbedded Controllers OUT 1 8 BATTInte ..
MAX818MCSA ,+5V Microprocessor Supervisory CircuitsApplications TOP VIEWBattery-Powered Computers and ControllersEmbedded Controllers OUT 1 8 BATTInte ..
MAX818MCSA+ ,+5V Microprocessor Supervisory CircuitsApplicationsTOP VIEWBattery-Powered Computers and ControllersEmbedded ControllersOUT 1 8 BATTIntell ..
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. ..
MB81C81A-35 ,CMOS 256K-BIT HIGH-SPEED SRAMMay 1990 00 Edition1.0 FUJITSU M38 1 C8 1A-25/-35 CMOS 256K-BI T HIGH-SPEED SRAM 256K Words ..
MB81F643242C-10FN ,4 x 512K x 32 bit synchronous dynamic RAMFUJITSU SEMICONDUCTORADVANCED INFO. AE0.1EDATA SHEETMEMORYCMOS4 · 512 K · 32 BITSYNCHRONOUS DYNAMIC ..
MB81F643242C-10FN ,4 x 512K x 32 bit synchronous dynamic RAMfeatures a fully synchronous operation referenced to a positive edge clock whereby all operations a ..
MB81N643289-60FN ,8 x 256K x 32 bit double data rate FCRAMapplications where large memory density and high effective bandwidth arerequired and where a simple ..


MAX817LCSA+-MAX817LCUA+-MAX817LESA+-MAX818LCPA+-MAX818LCSA+-MAX818LCSA+T-MAX818MCSA+-MAX818MCUA+-MAX818MEPA+-MAX819LCSA+-MAX819MCSA+-MAX819MESA+
+5V Microprocessor Supervisory Circuits
General Description
The 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.
________________________Applications

Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Critical µP Monitoring
Portable Equipment
____________________________Features
Precision 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 VCC
Battery 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

WDIGND
PFOPFI
BATT
RESETVCC
OUT
MAX817
DIP/SO/μMAX

TOP VIEW
_________________Pin Configurations

19-0486; Rev 3; 12/05
PART†
MAX817_CPA

MAX817_CSA
MAX817_CUA0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE

8 Plastic DIP
8 SO
8 µMAX
______________Ordering Information_____________________Selector Guide
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.
Devices 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.
SUFFIXRESET THRESHOLD (V)
4.654.40
FEATUREMAX817
L/M

Active-Low Reset✔
Backup-Battery Switchover✔
MAX818
L/M

MAX819
L/M

Power-Fail Comparator✔—
Watchdog Input✔✔
Battery Freshness Seal✔✔
Manual Reset Input——
Chip-Enable Gating—✔
Pin-Package8-DIP/SO/
µMAX
8-DIP/SO/
µMAX
8-DIP/SO/
µMAX
Low-Power, Pin-
Compatible Upgrades for:
MAX690A/
MAX692A—MAX703/
MAX704
Typical Operating Circuit appears at end of data sheet.

Pin Configurations continued at end of data sheet.*P
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
As applicable; CEIN = 0V,
WDI and MRunconnected
VCC< VRST
IOUT= 50mA
IOUT= 5mA
VCC= 0V, VOUT= 0V
IOUT= 250µA, VCC< (VBATT- 0.2V)
CONDITIONS
40Battery Switchover Hysteresis-20
Battery Switch Threshold
(VCC- VBATT)VBATT -VBATT -
0.10.02VOUTin Battery-Backup Mode1160ISUPPLYSupply Current (excluding IOUT)114505.5Operating Voltage Range, VCC,
VBATT(Note 2)100BATT to OUT On-Resistance510VCCto OUT On-ResistanceVCC- VCC-
VOUTOutput
VCC- VCC-
0.050.0255.01BATT Leakage Current,
Freshness Seal Enabled
UNITSMINTYPMAXSYMBOLPARAMETER

VCC= 0VSupply Current in Battery-
Backup Mode (excluding IOUT)
MAX81_ _C
MAX81_ _E= +25°C= TMINto
TMAX
Power-up
Power-down= +25°C= TMINto
TMAX
5.5V > VCC> (VBATT+ 0.2V)BATT Standby Current (Note 3)
-0.100.02-1.000.02
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

VPFO= 0V
VPFI> 1.30V, ISOURCE= 40µA, VCC> 4.5V
MAX81_M
VPFI< 1.20V, ISINK= 3.2mA, VCC> 4.50V
MAX81_L
WDI = GND, time average
From VRST, VCCfalling at 10V/ms
WDI = VCC, time average
VCC= 5V
MAX81_ _C, VCC= 1V, VCCfalling,
VBATT= 0V, ISINK= 50µA
VCC> VRST(MAX), ISOURCE= 800µA
VCC< VRST(MIN), ISINK= 3.2mA
VIL= 0.4V, VIH= 0.8VCC
CONDITIONS
250500PFOShort-Circuit Current
VCC- 1.5VOHPFOOutput VoltageV0.4VOL-250.0125IPFIPFI Input Current4PFI Input Hysteresis1.201.251.30VPFTPFI Input Threshold-20-15WDI Input Current (Note 5)1201603.5VIHWDI Input Threshold (Note 4)0.8VIL50tWDIWDI Pulse Width4.254.404.50VRSTReset Threshold4.504.654.75
sec1.001.602.25tWDWatchdog Timeout Period100VCCto RESETDelay
0.325Reset Threshold Hysteresis140200280tRPReset Timeout Period
VCC- 1.5VOH
VOL
UNITSMINTYPMAXSYMBOLPARAMETER

MAX81_ _E, VCC= 1.2V, VCCfalling,
VBATT= 0V, ISINK= 100µA
RESETOutput Voltage
0.8V2.0
VILMRInput Threshold1MRPulse Width
VIH100MRPulse that Would Not Cause
a Reset120MRto Reset Delay456385MRPull-Up Resistance
RESET AND WATCHDOG TIMER
POWER-FAIL COMPARATOR (MAX817/MAX819 only)
MANUAL RESET INPUT (MAX819 only)
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.)
Power-down
VCC= 5V
IOUT= -1µA, VCC= 0V, VBATT= 2.8V
IOUT= -100µA, VCC= 0V
Enable mode
Disable mode
CONDITIONS
15RESETto CEOUT Delay
3.5VILCEOUT Input ThresholdV0.8VIH2.7VOHCEOUT OutputVCC- 1V40150CEIN to CEOUT Resistance
(Note 6)±0.005±1CEINLeakage Current
UNITSMINTYPMAXSYMBOLPARAMETER
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.
Disable mode, CEOUT = 0VmA0.10.752.0CEOUT Short-Circuit Current
(Reset Active)
50Ωsource impedance driver, CLOAD= 50pFns38CEIN to CEOUT Propagation
Delay (Note 7)
CHIP-ENABLE GATING (MAX818 only)
MAX817L/M, MAX818L/M, MAX819L/M
+5V Microprocessor Supervisory Circuits

SUPPLY 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)
VCC = 0V
VBATT = 5.0V
VBATT = 2.8V
VBATT = 2.0V
CE IN TO CE OUT ON-RESISTANCE
vs. TEMPERATURE
MAX817/18/19-03
TEMPERATURE (°C)
CE IN TO CE OUT ON-RESISTANCE (
VCE IN = 4V
VCE IN = 3V
VCE IN = 2V
BATT TO OUT ON-RESISTANCE
vs. TEMPERATURE
MAX817/18/19-04
TEMPERATURE (°C)
BATT TO OUT ON-RESISTANCE (
VBATT = 2.0V
VBATT = 2.8V
VBATT = 5.0V
VCC = 0V
VCC TO RESET PROPAGATION DELAY
vs. TEMPERATURE
MAX817/18/19-07
TEMPERATURE (°C)
TO RESET PROPAGATION DELAY (ms)
VCC FALLING AT:0.25V/ms
1V/ms
10V/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 VOLTAGE

MAX817/18/19-12
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)
tPD-
tPD+10060
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)
MAX81_L
MAX81_M
110100100010,000
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE

MAX817/18/19-11
RESET COMPARATOR OVERDRIVE, VTH-VCC (mV)
MAXIMUM TRANSIENT DURATION (
800RESET OCCURS
ABOVE CURVE
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

Ground. 0V reference for all signals.33
Input Supply Voltage, +5V input.22
Supply Output for CMOS RAM. When VCCrises above the reset threshold
or above VBATT, OUT is connected to VCCthrough an internal P-channel
MOSFET switch. When VCCfalls below VBATT, BATT connects to OUT.1
GND3
VCC2
OUT1
Power-Fail Comparator Output. When PFI is less than VPFTor when VCCis
below VBATT, PFOgoes low; otherwise PFOremains high. PFOis also used to
enable the battery freshness seal (see Battery Freshness Seal and Power-Fail
Comparatorsections).5
Chip-Enable Input. The input to the chip-enable gating circuit. Connect to
ground if unused.4—
Power-Fail Comparator Input. When VPFIis below VPFTor when VCCis below
VBATT, PFOgoes low; otherwise, PFOremains high (see Power-Fail Comparator
section). Connect to ground if unused.4
PFO5IN—
PFI4
Backup-Battery Input. When VCCfalls below VBATT, OUT switches from VCCto
BATT. When VCCrises above VBATT, OUT reconnects to VCC.88
Active-Low Reset Output. Pulses low for 200ms when triggered and remains
low whenever VCCis below the reset threshold or when MRis a logic low. It
remains low for 200ms after VCCrises above the reset threshold, the watchdog
triggers a reset, or MRgoes low to high.7
BATT8
RESET7
Manual Reset Input. A logic low on MRasserts reset. Reset remains asserted
for as long as MRis held low and for 200ms after MRreturns high. The active-
low input has an internal 63kΩpull-up resistor. It can be driven from a TTL- or
CMOS-logic line or shorted to ground with a switch. Leave open, or connect to
VCCif unused.—
Watchdog Input. If WDI remains either high or low for longer than the watch-
dog timeout period, the internal watchdog timer runs out and a reset is trig-
gered. If WDI is left unconnected or is connected to a high-impedance
three-state buffer, the watchdog feature is disabled. The internal watchdog
timer clears whenever reset is asserted, WDI is three-stated, or WDI sees a ris-
ing or falling edge. The WDI input is designed to be driven by a three-stated-
output device with a maximum high-impedance leakage current of 10µA and a
maximum output capacitance of 200pF. The output device must also be capa-
ble of sinking and sourcing 200µA when active.6
Chip-Enable Output. CEOUT goes low only if CEIN is low while reset is not
asserted. If CEIN is low when reset is asserted, CEOUT will remain low for
15µs or until CEIN goes high, whichever occurs first. CEOUT is pulled up to
OUT in battery-backup mode. CEOUT is also used to enable the battery
freshness seal (see Battery Freshness Seal section).—6
WDI—OUT—
FUNCTIONNAME
MAX817MAX818MAX819
PIN
MAX817L/M, MAX818L/M, MAX819L/M
+5V Microprocessor Supervisory Circuits

MAX817
MAX818
MAX819
VCC
BATT
WDI
PFI
CE IN
1.25V
CE OUT
GND
OUT
RESET
THIS PIN
FOR MAX819
ONLY.
THIS SECTION
FOR MAX817/
MAX818 ONLY.
THIS SECTION
FOR MAX817/
MAX819 ONLY.
THIS SECTION
FOR MAX818
ONLY.
PFO
CHIP-ENABLE
OUTPUT
CONTROL
1.25V
RESET
GENERATOR
BATTERY
FRESHNESS
SEAL CIRCUITRY
BATTERY SWITCHOVER
CIRCUITRY
WATCHDOG
TIMER
Figure 1. Functional Diagram
ic,good price


TEL:86-533-2716050      FAX:86-533-2716790
   

©2020 IC PHOENIX CO.,LIMITED