(PDF) MAX819L Datasheet PDF | Maxim





MAX819L Datasheet PDF

Part Number MAX819L
Description +5V Microprocessor Supervisory Circuits
Manufacture Maxim
Total Page 16 Pages
PDF Download Download MAX819L Datasheet PDF

Features: Datasheet pdf 19-0494; Rev 1; 3/96 +5V Microprocessor Supervisory Circuits _______________Ge neral Description The MAX817/MAX818/MAX 819 microprocessor (µP) supervisory ci rcuits simplify power-supply monitoring , battery control, and chip-enable gati ng in µP systems by reducing the numbe r of components required. These devices are designed for use in +5V-powered sy stems. Low supply current (11µA typica l) and small package size make these de vices ideal for portable applications. The MAX817/MAX818/MAX819 are specifical ly designed to ignore fast transients o n VCC. Other supervisory functions incl ude active-low reset, backupbattery swi tchover, watchdog input, battery freshn ess seal, and chip-enable gating. The S elector Guide below lists the specific functions available from each device. T hese devices offer two pretrimmed reset threshold voltages for ±5% or ±10% p ower supplies: 4.65V for the L versions and 4.40V for the M versions. The MAX8 17/ MAX818/MAX819 are available in space-saving µMAX packages, as we.

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MAX819L datasheet
19-0494; Rev 1; 3/96
+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 Guide below
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.
_____________________Selector Guide
FEATURE
MAX817 MAX818 MAX819
L/M L/M L/M
Active-Low Reset
Backup-Battery Switchover
Power-Fail Comparator
Watchdog Input
Battery Freshness Seal
Manual Reset Input
——
Chip-Enable Gating
Pin-Package
8-DIP/SO/ 8-DIP/SO/ 8-DIP/SO/
µMAX µMAX µMAX
Low-Power, Pin-
MAX690A/
Compatible Upgrades for: MAX692A
MAX703/
MAX704
________________________Applications
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Critical µP Monitoring
Portable Equipment
____________________________Features
o Precision Supply-Voltage Monitor:
4.65V (MAX81_L)
4.40V (MAX81_M)
o 11µA Quiescent Supply Current
o 200ms Reset Time Delay
o Watchdog Timer with 1.6sec Timeout
(MAX817/MAX818)
o Battery-Backup Power Switching; Battery Voltage
Can Exceed VCC
o Battery Freshness Seal
o On-Board, 3ns Gating of Chip-Enable Signals
(MAX818)
o Uncommitted Voltage Monitor for Power-Fail or
Low-Battery Warning (MAX817/MAX819)
o Manual Reset Input (MAX819)
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX817_CPA
0°C to +70°C
8 Plastic DIP
MAX817_CSA
0°C to +70°C
8 SO
MAX817_CUA
0°C to +70°C
8 µMAX
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
_________________Pin Configurations
TOP VIEW
OUT 1
VCC 2
GND 3
PFI 4
MAX817
8 BATT
7 RESET
6 WDI
5 PFO
Typical Operating Circuit appears at end of data sheet.
*Patents Pending
DIP/SO/µMAX
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

MAX819L datasheet
+5V Microprocessor Supervisory Circuits
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 = +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
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 = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Operating Voltage Range, VCC,
VBATT (Note 2)
Supply Current (excluding IOUT)
ISUPPLY
As applicable; CE IN = 0V,
WDI and MR unconnected
Supply Current in Battery-
Backup Mode (excluding IOUT)
VCC = 0V
BATT Standby Current (Note 3)
5.5V > VCC > (VBATT + 0.2V)
MAX81_ _C
MAX81_ _E
TA = +25°C
TA = TMIN to
TMAX
TA = +25°C
TA = TMIN to
TMAX
0
-0.10
-1.00
11
11
0.05
5.5
45
60
1.0
5.0
0.02
0.02
V
µA
µA
µA
BATT Leakage Current,
Freshness Seal Enabled
VCC = 0V, VOUT = 0V
1 µA
VOUT Output
VCC to OUT On-Resistance
BATT to OUT On-Resistance
VOUT in Battery-Backup Mode
IOUT = 5mA
IOUT = 50mA
IOUT = 250µA, VCC < (VBATT - 0.2V)
VCC - VCC -
0.05 0.025
VCC - VCC -
0.5 0.25
5
100
VBATT - VBATT -
0.1 0.02
10
V
V
Battery Switch Threshold
(VCC - VBATT)
Battery Switchover Hysteresis
VCC < VRST
Power-up
Power-down
20
-20
40
mV
mV
2 _______________________________________________________________________________________




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