X4643 XICOR [Xicor Inc.], X4643 Datasheet

X4643

Manufacturer Part Number

X4643

Description

CPU Supervisor with 64K EEPROM

Manufacturer

XICOR [Xicor Inc.]

Datasheets

1.X4643.pdf (22 pages)

2.X4643.pdf (22 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

BOSTOCK HK LIMITED

Part Number:

X4643

Manufacturer:

XILINX

Company:

Meier Automation Equipment Co., Limited

Part Number:

X4643

Manufacturer:

XICOR

Quantity:

20 000

Current page: 1 of 22
Download datasheet (401Kb)

Preliminary Information

64K

FEATURES

• Selectable watchdog timer

• Low V

• Low power CMOS

• 64Kbits of EEPROM

• Built-in inadvertent write protection

• 400kHz 2-wire interface

• 2.7V to 5.5V power supply operation

• Available packages

BLOCK DIAGRAM

REV 1.26 4/30/02

—Four 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

—64-byte page write mode

—Self-timed write cycle

—5ms write cycle time (typical)

—Power-up/power-down protection circuitry

—8-lead SOIC

—8-lead TSSOP

SDA

SCL

special programming sequence

detection and reset assertion

reset threshold voltage using

Reset Logic

Command

Decode &

Control

Data

Logic

Threshold

Watchdog Transition

CPU Supervisor with 64K EEPROM

= 1V

Detector

TRIP

EEPROM Array

Protect Logic

www.xicor.com

X4643/5

Status

DESCRIPTION

The X4643/5 combines four popular functions, Power-on

Reset Control, Watchdog Timer, Supply Voltage

Supervision, and Serial EEPROM Memory in one

package. This combination lowers system cost,

reduces board space requirements, and increases reli-

ability.

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 protection

mechanism for microcontrollers. When the microcon-

troller fails to restart a timer within a selectable time out

interval, the device activates the 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. Four industry

Power on and

Timer Reset

Low Voltage

Watchdog

Generation

Watchdog

Timebase

Reset &

Reset

Characteristics subject to change without notice.

falls below the set minimum V

detection circuitry protects the

RESET (X4643/5)

RESET (X4645)

8K x 8 Bit

returns to

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