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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX802L Datasheet

Microprocessor Supervisory Circuits

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MAX802L pdf
MAX690A/MAX692A/
MAX802L/MAX802M/
MAX805L
Microprocessor Supervisory Circuits
General Description
The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L
reduce the complexity and number of components
required for power-supply monitoring and battery-
control functions in microprocessor (μP) systems. They
significantly improve system reliability and accuracy
compared to separate ICs or discrete components.
These parts provide four functions:
1) A reset output during power-up, power-down, and
brownout conditions.
2) Battery-backup switching for CMOS RAM, CMOS μP,
or other low-power logic.
3) A reset pulse if the optional watchdog timer has not
been toggled within 1.6s.
4) A 1.25V threshold detector for power-fail warning or
low-battery detection, or to monitor a power supply
other than +5V.
The parts differ in their reset-voltage threshold levels and
reset outputs. The MAX690A/MAX802L/MAX805L generate
a reset pulse when the supply voltage drops below 4.65V,
and the MAX692A/MAX802M generate a reset below 4.40V.
The MAX802L/MAX802M guarantee power-fail accuracies
to ±2%. The MAX805L is the same as the MAX690A except
that RESET is provided instead of RESET.
All parts are available in 8-pin DIP and SO packages.
The MAX690A/MAX802L are pin compatible with the
MAX690 and MAX694. The MAX692A/MAX802M are pin
compatible with the MAX692.
Applications
Battery-Powered Computers and Controllers
● Intelligent Instruments
Critical μP Power Monitoring
Typical Operating Circuit
UNREGULATED
DC
0.1µF
R1
R2 3.6V
LITHIUM
BATTERY
REGULATED +5V
VCC RESET
PFI
MAX690A PFO
MAX802L WDI
VBATT
VOUT
GND
VCC
RESET µP
NMI
I/O LINE GND
BUS
VCC
CMOS
RAM
GND
Features
Precision Supply Voltage Monitor:
4.65V for MAX690A/MAX802L/MAX805L
4.40V for MAX692A/MAX802M
Reset Time Delay: 200ms
Watchdog Timer: 1.6s Timeout
Battery-Backup Power Switching
200μA Quiescent Supply Current
50nA Quiescent Supply Current in Battery-
Backup Mode
Voltage Monitor for Power-Fail or Low-Battery
Warning
Power-Fail Accuracy Guaranteed to ±2%
(MAX802L/M)
Guaranteed RESET Assertion to VCC = 1V
8-Pin SO and DIP Packages
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX690ACPA
0°C to +70°C
8 Plastic DIP
MAX690ACSA
0°C to +70°C
8 SO
MAX690AC/D
0°C to +70°C
Dice*
MAX690AEPA
-40°C to +85°C
8 Plastic DIP
MAX690AESA
-40°C to +85°C
8 SO
MAX690AMJA
-55°C to +125°C 8 CERDIP**
Ordering Information continued at end of data sheet.
*Dice are specified at TA = +25°C
**Contact factory for availability and processing to MIL STD-
883. Devices in PDIP and SO packages are available in both
leaded and lead(Pb)-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.
Pin Configurations
TOP VIEW
VOUT 1
VCC 2
GND 3
PFI 4
MAX690A
MAX692A
MAX802L
MAX802M
MAX805L
DIP/SO
( ) ARE FOR MAX805L ONLY.
8 VBATT
7 RESET (RESET)
6 WDI
5 PFO
19-4333; Rev 5; 4/15


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX802L Datasheet

Microprocessor Supervisory Circuits

No Preview Available !

MAX802L pdf
MAX690A/MAX692A/
MAX802L/MAX802M/
MAX805L
Microprocessor Supervisory Circuits
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
VCC...................................................................-0.3V to +6.0V
VBATT................................................................-0.3V to +6.0V
All Other Inputs (Note 1)........................... -0.3V to (VCC + 0.3V)
Input Current
VCC...............................................................................200mA
VBATT..............................................................................50mA
GND................................................................................20mA
Output Current
VOUT.............................. Short-Circuit Protected for up to 10s
All Other Outputs.............................................................20mA
Rate of Rise, VCC, VBATT...............................................100V/μs
Continuous Power Dissipation
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:
MAX69_AC_ _, MAX80_ _ C_ _.........................0°C to +70°C
MAX69_AE_ _, MAX80_ _ E_ _ .................... -40°C to +85°C
MAX69_AMJA, MAX805LMJA...................... -55°C to +125°C
Storage Temperature Range............................. -65°C to +160°C
Lead Temperature (soldering, 10s)................................. +300°C
Note 1: The input voltage limits on PFI and WDI may be exceeded 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 MAX690A/MAX802L/MAX805L, VCC = 4.5V to 5.5V for MAX692A/MAX802M, VBATT = 2.8V, TA = TMIN to
TMAX, unless otherwise noted.)
PARAMETER
Operating Voltage Range,
VCC, VBATT (Note 2)
Supply Current (Excluding IOUT)
ISUPPLY in Battery-Backup
Mode (Excluding IOUT)
VBATT Standby Current
(Note 3)
SYMBOL
ISUPPLY
CONDITIONS
MAX69_AC, MAX802_C
MAX805LC
MAX69_AE/M, MAX80_ _E
MAX69_AC, MAX802_C
MAX69_AE/M, MAX802_E, MAX805LE/M
VCC = 0V,
VBATT = 2.8V
5.5V > VCC >
VBATT +0.2V
TA = +25°C
TA = TMIN to TMAX
TA = +25°C
TA = TMIN to TMAX
VOUT Output
IOUT = 5mA
IOUT = 50mA
VOUT in Battery-Backup Mode
Battery Switch Threshold, VCC
to VBATT
Battery Switchover Hysteresis
Reset Threshold
Reset Threshold Hysteresis
Reset Pulse Width
IOUT = 250μA, VCC < VBATT - 0.2V
VCC < VRT
Power-up
Power-down
MAX690A, MAX802L, MAX805L
MAX692A, MAX802M
VRT MAX802L, TA = +25°C, VCC falling
MAX802M, TA = +25°C, VCC falling
tRS
MIN TYP
1.0
1.1
1.2
200
200
0.05
-0.1
-1.0
VCC
- 0.05
VCC
- 0. 5
VBATT
- 0.1
4.50
4.25
4.55
4.30
140
VCC
- 0.025
VCC
- 0. 25
VBATT
- 0.02
20
-20
40
4.65
4.40
40
200
MAX
5.5
5.5
5.5
350
500
1.0
5.0
0.02
0.02
4.75
4.50
4.70
4.45
280
UNITS
V
µA
µA
µA
V
V
mV
mV
V
mV
ms
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX802L
Description Microprocessor Supervisory Circuits
Maker Maxim Integrated Products
Total Page 13 Pages
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