X4285 XICOR [Xicor Inc.], X4285 Datasheet

X4285

Manufacturer Part Number

X4285

Description

CPU Supervisor with 128K EEPROM

Manufacturer

XICOR [Xicor Inc.]

Datasheets

1.X4285.pdf (22 pages)

2.X4285.pdf (22 pages)

Current page: 1 of 22
Download datasheet (404Kb)

Preliminary Information

128K

FEATURES

• Selectable watchdog timer

• Low V

• Low power CMOS

• 128Kbits of EEPROM

• Built-in inadvertent write protection

• 400kHz 2-wire interface

• 2.7V to 5.5V power supply operation

• Available packages

BLOCK DIAGRAM

REV 1.17 11/27/00

—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

—Protect 0, 1/4, 1/2, all or 64, 128, 256 or 512

—8-lead SOIC

—8-lead TSSOP

SDA

SCL

special programming sequence

bytes of EEPROM array with programmable

Block Lock

detection and reset assertion

™

protection

reset threshold voltage using

Reset logic

Command

Decode &

Control

Data

Logic

Threshold

Watchdog Transition

CPU Supervisor with 128K EEPROM

= 1V

Detector

TRIP

EEPROM Array

X4283/85

Protect Logic

www.xicor.com

Status

DESCRIPTION

The X4283/85 combines four popular functions,

Power-on Reset Control, Watchdog Timer, Supply Volt-

age 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 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

trip point. RESET/RESET is asserted until V

to proper operating level and stabilizes. Four industry

Power on and

Timer Reset

Low Voltage

Generation

Watchdog

Timebase

Reset &

Reset

Characteristics subject to change without notice.

falls below the set minimum V

detection circuitry protects the

16K x 8 Bit

RESET (X4283)

RESET (X4285)

returns

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