X40010/X40011/X40014/X40015 – Preliminary

Characteristics subject to change without notice.

2 of 25

REV 1.3.4 7/12/02

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threshold for either voltage monitor to be repro-

grammed to meet special needs or to fine-tune the

threshold for applications requiring higher precision.

The Watchdog Timer provides an independent protec-

tion mechanism for microcontrollers. When the micro-

controller fails to restart a timer within a selectable time

out interval, the device activates the WDO signal. The

user selects the interval from three preset values. Once

selected, the interval does not change, even after

cycling the power.

The device features a 2-wire interface and software

Dual Voltage Monitors

PIN CONFIGURATION

Device

Expected System Voltages

Vtrip1(V)

Vtrip2(V)

POR (system)

X40010/11

-A

-B

-C

5V; 3V or 3.3V

5V; 3V

3V; 3.3V; 1.8V

2.0–4.75*

4.55–4.65*

4.35–4.45*

2.85–2.95*

1.70–4.75

2.85–2.95

2.55–2.65

1.65–1.75

RESET = X40010

RESET = X40011

X40014/15

-A

-B

-C

3V; 3.3V; 1.5V

3V; 1.5V

3V or 3.3V; 1.1 or 1.2V

2.0–4.75*

2.85–2.95*

2.55–2.65*

2.85–2.95*

0.90–3.50*

1.25–1.35*

1.25–1.35*

0.95–1.05*

RESET = X40014

RESET = X40015

PIN DESCRIPTION

Pin

Name

Function

SOIC TSSOP

1

3

2

4

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

(X40014/15).

3

5

RESET/

RESET

RESET Output. (X40011/15) This is an active LOW, open drain output which goes active when-

thereafter.

RESET Output. (X40010/14) This is an active HIGH CMOS output which goes active whenever

after.

46

Ground

SDA

3

2

4

1

6

7

5

8

RESET/RESET

V2MON

3

2

4

1

6

7

5

8

SCL

WDO

V2FAIL

RESET/RESET

SCL

SDA

V2FAIL

V2MON

WDO

X40010/14, X40011/15

X40010/14, X40011/15

8-Pin SOIC

8-Pin TSSOP