DS1831/A/B
Multisupply Micromonitor
www.maxim-ic.com
FEATURES
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5V power-on reset
3.3V power-on reset
Two referenced comparators with separate
outputs for monitoring additional supplies
Internal power is drawn from higher of either
the IN5V input or the IN3.3V input
Excellent for systems designed to operate
with multiple power supplies
Asserts resets during power transients
Pushbutton reset input for system override
Maintains reset for user configurable times
of 10ms, 100ms, or 1s
Watchdog timer for software monitoring
(DS1831A)
Precision temperature-compensated voltage
reference and voltage sensor
16 pin DIP and 16 pin 150mil SO available
Operating Temperature of -40°C to +85°C
PIN ASSIGNMENT
DS1831
IN5V
1
16
IN3.3V
RST5V
2
15
RST3.3V
TOL5V
3
14
TOL3.3V
TD5V
4
13
TD3.3V
PBRST5V
5
12
PBRST3.3V
IN1
6
11
NMI1
IN2
7
10
NMI2
GND
8
9
MPBRST
16-Pin (300mil) DIP
&
16-Pin (150mil) SO
DS1831B
DS1831A
IN5V
1
16
IN3.3V
RST3.3V
RST5V
2
15
RST3.3V
14
TOL3.3V
TOL5V
3
14
TOL3.3V
4
13
TD3.3V
TD5V
4
13
TD3.3V
PBRST5V
5
12
PBRST3.3V
PBRST5V
5
12
PBST
IN1
6
11
NMI1
IN1
6
11
NMI1
ST
7
10
WDS
IN2
7
10
NMI2
GND
8
9
TDWD
GND
8
9
IN5V
1
16
IN3.3V
RST5V
2
15
TOL5V
3
TD5V
MPBRST
16-Pin (300mil) DIP
&
16-Pin (150mil) SO
16-Pin (300mil) DIP
&
16-Pin (150mil) SO
DESCRIPTION
The DS1831 multisupply monitor and reset monitors up to four system voltages: 5V supply, 3.3V (or 3V)
supply, and two additional user configurable voltage monitors. DS1831 power for internal operation
comes from the higher voltage level of the 3.3V input or the 5V input. One of these inputs must be greater
than 1V for device operation. Pushbutton (manual reset) functionality is provided for the 5V reset, the
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