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DS1831C/D/E

3.3V/2.5V Multisupply MicroMonitor

www.maxim-ic.com

FEATURES

摟

摟

摟

摟

摟

摟

摟

摟

摟

摟

摟

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2.5V power-on reset

3.3V (or 3V) power-on reset

Two referenced comparators with separate

outputs for monitoring additional supplies

Internal power is drawn from higher of either

the IN

2.5V

input or the IN

3.3V

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

(DS1831D)

Precision temperature-compensated voltage

reference and voltage sensor

16-pin DIP and 16-pin 150mil SO available

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

DS1831D

IN

2.5V

RST

2.5V

TOL

2.5V

TD

2.5V

PBRST

2.5V

IN1

ST

GND

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

IN

3.3V

RST

3.3V

TOL

3.3V

TD

3.3V

PBRST

3.3V

NMI1

WDS

TD

WD

PIN ASSIGNMENT

DS1831C

IN

2.5V

RST

2.5V

TOL

2.5V

TD

2.5V

PBRST

2.5V

IN1

IN2

GND

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

IN

3.3V

RST

3.3V

TOL

3.3V

TD

3.3V

PBRST

3.3V

NMI1

NMI2

MPBRST

16-Pin (300mil) DIP

&

16-Pin (150mil) SO

DS1831E

IN

2.5V

RST

2.5V

TOL

2.5V

TD

2.5V

PBRST

2.5V

IN1

IN2

GND

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

IN

3.3V

RST

3.3V

TOL

3.3V

TD

3.3V

PBRST

3.3V

NMI1

NMI2

MPBRST

16-Pin (300mil) DIP

&

16-Pin (150mil) SO

16-Pin (300mil) DIP

&

16-Pin (150mil) SO

DESCRIPTION

The DS1831C multisupply monitor and reset monitors up to four system voltages: 2.5V 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 2.5V input. One of these inputs must be

greater than 1V for device operation. Pushbutton (manual reset) functionality is provided for the 2.5V

1 of 15

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