2

FN8251.0

July 29, 2005

BLOCK DIAGRAM

*Voltage monitor requires Vcc to operate. Others are independent of Vcc.

PIN CONFIGURATION

V3FAIL

V2FAIL

WDO

MR

LOWLINE

RESET

RESET

X40430/34

X40431/35

V3 Monitor

Logic

V2 Monitor

Logic

Fault Detection

Register

Status

Register

EEPROM

Array

Data

Register

Command

Decode Test

& Control

Logic

Power-on,

Manual Reset

Low Voltage

Reset

Generation

Logic

V3MON

V2MON

SDA

WP

SCL

(V1MON)

+

-

+

-

Watchdog

and

Reset Logic

+

-

*X40430, X40431=

V2MON*

V2MON

Device

Expected System

Voltages

Vtrip1(V)

Vtrip2(V)

Vtrip3(V)

POR

(system)

X40430, X40431

-A

-B

-C

5V; 3V or 3.3V; 1.8V

5V; 3V; 1.8V

3.3V; 2.5V; 1.8V

2.0–4.75*

4.55–4.65*

4.35–4.45*

2.95–3.05*

1.70–4.75

2.85–2.95

2.55–2.65

2.15–2.25

1.70–4.75

1.65–1.75

1.65–1.75

1.65–1.75

RESET = X40430

RESET = X40431

X40434, X40435

-A

-B

-C

5V; 3.3V; 1.5V

5V; 3V or 3.3V; 1.5V

5V; 3 or 3.3V; 1.2V

2.0–4.75*

4.55–4.65*

4.55–4.65*

4.55–4.65*

0.90–3.50*

1.25–1.35*

1.25–1.35*

0.95–1.05*

1.70–4.75

3.05–3.15

2.85–2.95

2.85–2.95

RESET = X40434

RESET = X40435

V3MON

SDA

SCL

3

2

4

1

12

13

11

14

LOWLINE

NC

RESET

7

6

5

8

9

10

V2MON

MR

WP

3

2

4

1

12

13

11

14

7

6

5

8

9

10

V3FAIL

WDO

V2FAIL

V3MON

SDA

SCL

WP

V3FAIL

WDO

LOWLINE

NC

RESET

V2MON

MR

V2FAIL

X40430, X40434

X40431, X40435

14-Pin SOIC, TSSOP

14-Pin SOIC, TSSOP

PIN DESCRIPTION

Pin

Name

Function

1V2FAIL

2V2MON

This input can monitor an unregulated power supply with an external resistor divider or can monitor a

4NC

No connect.

X40430, X40431, X40434, X40435