X4045 INTERSIL [Intersil Corporation], X4045 Datasheet

X4045

Manufacturer Part Number

X4045

Description

CPU Supervisor with 4kbit EEPROM

Manufacturer

INTERSIL [Intersil Corporation]

Datasheets

1.X4043S8IZT2.pdf (24 pages)

2.X4045.pdf (24 pages)

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Download datasheet (374Kb)

CPU Supervisor with 4kbit EEPROM

FEATURES

• Selectable watchdog timer

• Low V

• Low power CMOS

• 4kbits of EEPROM

• Built-in inadvertent write protection

• 400kHz 2-wire interface

• 2.7V to 5.5V power supply operation

• Available packages

• Pb-free plus anneal available (RoHS compliant)

BLOCK DIAGRAM

—Five standard reset threshold voltages

—Adjust low V

—Reset signal valid to V

—<20µA max standby current, watchdog on

—<1µA standby current, watchdog OFF

—3mA active current

—16-byte page write mode

—Self-timed write cycle

—5ms write cycle time (typical)

—Power-up/power-down protection circuitry

—Protect 0, 1/4, 1/2, all or 16, 32, 64 or 128 bytes

—8 Ld SOIC

—8 Ld MSOP

—8 Ld PDIP

special programming sequence

of EEPROM array with Block Lock

SDA

SCL

detection and reset assertion

reset threshold voltage using

Reset logic

Command

Decode &

Control

Threshold

Logic

Data

Watchdog Transition

= 1V

Data Sheet

Detector

™

TRIP

protection

EEPROM Array

Protect Logic

1-888-INTERSIL or 1-888-468-3774

Status

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

DESCRIPTION

The X4043/45 combines four popular functions,

Power-on Reset Control, Watchdog Timer, Supply

Voltage Supervision, and Block Lock Protect Serial

EEPROM Memory in one package. This combination

lowers system cost, reduces board space require-

ments, and increases reliability.

Applying power to the device activates the power-on

reset circuit which holds RESET/RESET active for a

period of time. This allows the power supply and oscilla-

tor to stabilize before the processor can execute code.

The Watchdog Timer provides an independent protec-

tion mechanism for microcontrollers. When the micro-

controller fails to restart a timer within a selectable

time

RESET/RESET signal. The user selects the interval

from three preset values. Once selected, the interval

does not change, even after cycling the power.

The device’s low V

user’s system from low voltage conditions, resetting the

system when V

point. RESET/RESET is asserted until V

proper operating level and stabilizes. Five industry stan-

dard V

unique circuits allow the threshold to be reprogrammed

to meet custom requirements or to fine-tune the thresh-

old for applications requiring higher precision.

Power-on and

Timer Reset

Low Voltage

Generation

Watchdog

Timebase

Reset &

March 16, 2006

TRIP

out

Reset

All other trademarks mentioned are the property of their respective owners.

Intersil (and design) is a registered trademark of Intersil Americas Inc.

thresholds are available, however, Intersil’s

interval,

falls below the minimum V

detection circuitry protects the

the

X4043, X4045

device

4k, 512 x 8 Bit

RESET (X4043)

RESET (X4045)

activates

FN8118.2

returns to

the

trip

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