MAX802L Maxim Integrated Products, MAX802L Datasheet
MAX802L
Manufacturer Part Number
MAX802L
Description
Microprocessor Supervisory Circuits
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX802L.pdf
(12 pages)
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19-4333; Rev 3; 9/93
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 signifi-
cantly 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
2) Battery-backup switching for CMOS RAM, CMOS
3) A reset pulse if the optional watchdog timer has not
4) A 1.25V threshold detector for power-fail warning or
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 guaran-
tee 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.
__________________General Description
Call toll free 1-800-998-8800 for free samples or literature.
__________Typical Operating Circuit
_______________________Applications
UNREGULATED DC REGULATED +5V
brownout conditions.
µP, or other low-power logic.
been toggled within 1.6sec.
low-battery detection, or to monitor a power supply
other than +5V.
R
R
1
2
Battery-Powered Computers and Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
BATTERY
LITHIUM
O.1 F
3.6V
MAX690A
MAX802L
________________________________________________________________ Maxim Integrated Products
PFI
V
V
BATT
CC
GND
RESET
V
PFO
WDI
OUT
Microprocessor Supervisory Circuits
V
V
RESET
NMI
I/O LINE GND
CC
CC
CMOS
RAM
P
GND
Ordering Information continued on last page.
* Dice are specified at T
**Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations
______________Ordering Information
MAX690ACPA
MAX690ACSA
MAX690AC/D
MAX690AEPA
MAX690AESA
MAX690AMJA
___________________________Features
TOP VIEW
Precision Supply-Voltage Monitor:
4.65V for MAX690A/MAX802L/MAX805L
4.40V for MAX692A/MAX802M
Reset Time Delay – 200ms
Watchdog Timer – 1.6sec 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
8-Pin SO and DIP Packages
( ) ARE FOR MAX805L ONLY.
PART
V
GND
V
OUT
PFI
CC
RESET
1
2
3
4
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP. RANGE
A
0°C to +70°C
0°C to +70°C
0°C to +70°C
= +25°C
MAX802M
MAX690A
MAX692A
MAX802L
MAX805L
DIP/SO
Assertion to V
8
7
6
5
V
RESET (RESET)
WDI
PFO
CC
BATT
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 CERDIP**
Dice*
PIN-PACKAGE
= 1V
1
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