2000 © IMP, Inc.

408-432-9100/www.impweb.com

1

IMP1

233M

Key Features

Applications

N Set-top boxes

N Cellular phones

N PDAs

N Energy management systems

N Embedded control systems

N Printers

N Single board computers

N Improved Dallas DS1233M replacement

— 60% lower maximum supply current

N Low Supply Current

— 20µA maximum (5.5V)

— 15µA maximum (3.6V)

N Automatically restarts a microprocessor after

power failure

in-tolerance condition

N Active LOW power-up reset, 5kΩ internal pull-up

N Precision temperature-compensated voltage

reference and comparator

N Eliminates external components

N Pin function compatible with the Motorola

MC33064, MC34064, MC33164 and MC34164

N Motorola 68xxx and HC16 compatible

N Compact surface mount SO-8 package

N Operating temperature –40°C to +85°C

Block Diagram

–

+

1233M_01.eps

RESET

GND

5.0k

9

Supply

Tolerance

Bias

IMP1233M

Delay

350ms Typical

Reference

Lo

eset

– A

ain Output

– 350ms R

iod

The IMP1233M supply voltage monitor is an improved, low-power

replacement for the Dallas Semiconductor DS1233M. Maximum supply

current over temperature is a low 20

µA, representing 60 percent lower

power as compared to the DS1233M.

The IMP1233M issues an active LOW reset signal whenever the moni-

tored supply is out-of-tolerance. A precision reference and comparator

5- and 10-percent for a 5V power supply. The tolerance is 15-percent for

the 3.3V, IMP1233M. When an out-of-tolerance condition is detected, an

internal power-fail signal is generated which forces an active LOW reset

remains active for 350ms to allow the power supply and system micro-

processor to stabilize.

The IMP1233M is designed with a open-drain output stage and operates

over the extended industrial temperature range. Devices are available in

the compact surface mount SO-8 package.

Other low power products in this family include the IMP1810/11/12/15/

16/17 and IMP1233D.

Typical Application

IMP1233M

Microprocessor

RESET

RESET

1233M_02.eps

VCC

GND

t

r

a

P

e

g

a

t

l

o

V

T

E

S

E

R

)

V

(

e

m

i

T

T

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R

)

s

m

(

t

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p

t

u

O

e

g

a

t

S

T

E

S

E

R

y

t

i

r

a

l

o

P

0

1

8

1

P

M

I0

2

1

.

4

,

0

7

3

.

4

,

0

2

6

.

40

5

1ll

u

P

-

h

s

u

PW

O

L

1

1

8

1

P

M

I0

3

1

.

4

,

0

5

3

.

4

,

0

2

6

.

40

5

1n

i

a

r

D

-

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OW

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2

1

8

1

P

M

I0

3

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4

,

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5

3

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4

,

0

2

6

.

40

5

1ll

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h

s

u

PH

G

I

H

5

1

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5

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2

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8

8

.

2

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6

0

.

30

5

1ll

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-

h

s

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PW

O

L

6

1

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1

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I0

5

5

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2

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0

8

8

.

2

,

0

6

0

.

30

5

1n

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7

1

8

1

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5

5

.

2

,

0

8

8

.

2

,

0

6

0

.

30

5

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u

P

-

h

s

u

PH

G

I

H

D

3

3

2

1

P

M

I5

2

1

.

4

,

5

7

3

.

4

,

5

2

6

.

40

5

3n

i

a

r

D

-

n

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p

OW

O

L

M

3

3

2

1

P

M

I0

2

7

.

2

,

5

7

3

.

4

,

5

2

6

.

40

5

3n

i

a

r

D

-

n

e

p

OW

O

L

Family Selection Guide