MAX690A/MAX692A/
MAX802L/MAX802M/
MAX805L
Microprocessor Supervisory Circuits
General Description
Features
● Precision Supply Voltage Monitor:
4.65V for MAX690A/MAX802L/MAX805L
4.40V for MAX692A/MAX802M
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.
● Reset Time Delay: 200ms
● Watchdog Timer: 1.6s Timeout
● Battery-Backup Power Switching
● 200μA Quiescent Supply Current
These parts provide four functions:
1) A reset output during power-up, power-down, and
brownout conditions.
● 50nA Quiescent Supply Current in Battery-
Backup Mode
2) Battery-backup switching for CMOS RAM, CMOS μP,
or other low-power logic.
● Voltage Monitor for Power-Fail or Low-Battery
Warning
3) A reset pulse if the optional watchdog timer has not
been toggled within 1.6s.
● Power-Fail Accuracy Guaranteed to ±2%
(MAX802L/M)
4) A 1.25V threshold detector for power-fail warning or
low-battery detection, or to monitor a power supply
other than +5V.
● Guaranteed RESET Assertion to V
● 8-Pin SO and DIP Packages
= 1V
CC
Ordering Information
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.
PART
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX690ACPA
MAX690ACSA
MAX690AC/D
MAX690AEPA
MAX690AESA
MAX690AMJA
0°C to +70°C
0°C to +70°C
Dice*
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 Plastic DIP
8 SO
8 CERDIP**
Ordering Information continued at end of data sheet.
*Dice are specified at T = +25°C
A
**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.
Applications
● Battery-Powered Computers and Controllers
● Intelligent Instruments
● Critical μP Power Monitoring
Typical Operating Circuit
Pin Configurations
UNREGULATED
DC
REGULATED +5V
V
CC
TOP VIEW
0.1µF
V
CC
RESET
RESET
NMI
R
1
µP
V
OUT
1
2
3
4
8
7
6
5
VBATT
MAX690A
MAX692A
MAX802L
MAX802M
MAX805L
PFO
WDI
MAX690A
MAX802L
PFI
V
V
CC
RESET (RESET)
WDI
I/O LINE
GND
GND
PFI
R
2
BATT
V
3.6V
LITHIUM
OUT
BUS
GND
PFO
BATTERY
V
CC
CMOS
RAM
DIP/SO
GND
( ) ARE FOR MAX805L ONLY.
19-4333; Rev 5; 4/15