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051100

FEATURES

2.5V power-on reset

3.3 (or 3V) power-on reset

2 referenced comparators with separate

outputs for monitoring additional supplies

Internal power is drawn from higher of either

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 10 ms, 100 ms, or 1 sec

Watchdog timer for software monitoring

(DS1831D)

Precision temperature-compensated voltage

reference and voltage sensor

16 pin DIP & 16 pin 150 mil SOIC available

Operating Temperature of -40°C to +85°C

PIN ASSIGNMENT

DESCRIPTION

The DS1831C Multi-Supply Monitor & Reset monitors up to 4 system voltages: 2.5 volt supply, 3.3 (or

3) volt supply, and 2 additional user configurable voltage monitors. DS1831 power for internal operation

comes from the higher voltage level of the 3.3 volt input or the 2.5 volt input. One of these inputs must

be greater than 1 volt for device operation. Pushbutton (manual reset) functionality is provided for the

2.5 volt reset, the 3.3 volt reset or for all reset outputs by the master pushbutton. The DS1831D replaces

one reference comparator and the master pushbutton with watchdog and the DS1831E replaces the

3.3-volt PBRST with a last reset status output.

TOL and TD inputs allow user configuration of the DS1831 for multiple applications. The TOL inputs

configure the tolerance for the specified output and the TD inputs configure the reset time delays.

DS1831C/D/E

3.3V/2.5V Multi-Supply MicroMonitor

www.dalsemi.com

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

NMI1

NMI2

MPBRST

IN1

IN2

GND

DS1831C

16-Pin (300 mil) DIP

&

16-Pin (150 mil) SOIC

6

7

8

11

10

9

NMI1

WDS

IN1

ST

GND

DS1831D

4

5

6

13

12

11

PBST

NMI1

IN1

DS1831E