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060303

FEATURES

§ 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

§ 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

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

DS1831/A/B

Multisupply Micromonitor

www.maxim-ic.com

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

NMI1

NMI2

MPBRST

IN1

IN2

GND

DS1831

16-Pin (300mil) DIP

&

16-Pin (150mil) SO

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

NMI1

WDS

IN1

ST

GND

DS1831A

16-Pin (300mil) DIP

&

16-Pin (150mil) SO

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

PBST

NMI1

NMI2

MPBRST

IN1

IN2

GND

DS1831B

16-Pin (300mil) DIP

&

16-Pin (150mil) SO