MAX1232EPA Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1232EPA Datasheet PDF : 8 Pages
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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.
Applications
●● Computers
●● Controllers
●● Intelligent Instruments
●● Critical μP Power Monitoring
Typical Operating Circuit
VCC
5%/10%
TOLERANCE
TOL
SELECT
RST
RESET
GENERATOR
REF
RST
PB RST DEBOUNCE
MAX1232
TD WATCHDOG
TIMEBASE
SELECT
WATCHDOG
ST
TIMER
GND
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
TEMP RANGE
PIN-PACKAGE
MAX1232C/D
0°C to +70°C
Dice*
MAX1232CPA
0°C to +70°C
8 PDIP
MAX1232CSA
0°C to +70°C
8 SO
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.
Pin Configurations
TOP VIEW
PB RST 1
TD 2
TOL 3
GND 4
MAX1232
8 VCC
7 ST
6 RST
5 RST
DIP/SO
N.C. 1
PB RST 2
N.C. 3
TD 4
N.C. 5
TOL 6
N.C. 7
GND 8
MAX1232
16 N.C.
15 VCC
14 N.C.
13 ST
12 N.C.
11 RST
10 N.C.
9 RST
WIDE SO
19-3899; Rev 2; 9/14
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