MAX1232
Microprocessor Monitor
General Description
The MAX1232 microprocessor (μP) supervisory circuit
provides μP housekeeping and power-supply supervision
functions while consuming only 1/10th the power of the
DS1232. The MAX1232 enhances circuit reliability in μP
systems by monitoring the power supply, monitoring the
software execution, and providing a debounced manual
reset input. The MAX1232 is a plug-in upgrade of the
Dallas DS1232.
A reset pulse of at least 250ms duration is supplied on
power-up, power-down, and low-voltage brownout con-
ditions (5% or 10% supply tolerances can be selected
digitally). Also featured is a debounced manual reset
input that forces the reset outputs to their active states
for a minimum of 250ms. A digitally programmable watch-
dog timer monitors software execution and can be pro-
grammed for timeout settings of 150ms, 600ms, or 1.2s.
The MAX1232 requires no external components.
Features
● Consumes 1/10th the Power of the DS1232
● Precision Voltage Monitor—Adjustable +4.5V or
+4.75V
● Power-OK/Reset Pulse Width—250ms Min
● No External Components
● Adjustable Watchdog Timer—150ms, 600ms, or 1.2s
● Debounced Manual Reset Input for External Override
● Available in 8-Pin PDIP/SO and 16-Pin Wide SO
Packages
Ordering Information
PART
MAX1232C/D
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
Dice*
8 PDIP
8 SO
Applications
●
●
●
●
Computers
Controllers
Intelligent Instruments
Critical μP Power Monitoring
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
Note:
Devices in PDIP and SO packages are available in both
leaded(Pb) and lead(Pb)-free packaging. Specify lead(Pb)-free by
adding the “+” symbol at the end of the part number when order-
ing. Lead-free not available for CERDIP package.
Typical Operating Circuit
V
CC
TOL
RST
5%/10%
TOLERANCE
SELECT
REF
RST
PB RST
DEBOUNCE
RESET
GENERATOR
Pin Configurations
TOP VIEW
PB RST
TD
TOL
1
2
3
8
V
CC
ST
RST
RST
MAX1232
7
6
5
GND 4
DIP/SO
N.C. 1
PB RST 2
N.C. 3
16 N.C.
15 V
CC
14 N.C.
MAX1232
TD
WATCHDOG
TIMEBASE
SELECT
GND
WATCHDOG
TIMER
ST
TD 4
N.C. 5
TOL 6
N.C. 7
GND 8
MAX1232
13 ST
12 N.C.
11 RST
10 N.C.
9
RST
WIDE SO
19-3899; Rev 2; 9/14
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
