X5043 XICOR [Xicor Inc.], X5043 Datasheet

X5043

Manufacturer Part Number

X5043

Description

CPU Supervisor with 4K SPI EEPROM

Manufacturer

XICOR [Xicor Inc.]

Datasheets

1.X5043.pdf (20 pages)

2.X5043.pdf (20 pages)

3.X5043.pdf (20 pages)

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Download datasheet (106Kb)

FEATURES

• Selectable time out watchdog timer

• Low V

• Long battery life with low power consumption

• 2.7V to 5.5V and 4.5V to 5.5V power supply

• 4Kbits of EEPROM–1M write cycle endurance

• Save critical data with Block Lock

• Built-in inadvertent write protection

• 3.3MHz clock rate

• Minimize programming time

• SPI modes (0,0 & 1,1)

• Available packages

BLOCK DIAGRAM

REV 1.1.2 5/29/01

—Five standard reset threshold voltages

—Re-program low V

—Reset signal valid to V

—<50µA max standby current, watchdog on

—<10µA max standby current, watchdog off

—<2mA max active current during read

versions

—Protect 1/4, 1/2, all or none of EEPROM array

—Write enable latch

—Write protect pin

—16-byte page write mode

—Self-timed write cycle

—5ms write cycle time (typical)

—8-lead MSOP, 8-lead SOIC, 8-pin PDIP

—14-lead TSSOP

CS/WDI

using special programming sequence.

SCK

detection and reset assertion

Reset Logic

Command

Decode &

Control

Logic

Threshold

Data

reset threshold voltage

CPU Supervisor with 4K SPI EEPROM

= 1V

Watchdog Transition

™

memory

Detector

TRIP

X5043/X5045

www.xicor.com

Protect Logic

1Kbits

2Kbits

Status

DESCRIPTION

These devices combine 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 requirements, 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 oscil-

lator to stabilize before the processor executes 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. Five industry

standard V

Xicor’s unique circuits allow the threshold to be repro-

grammed to meet custom requirements or to ﬁne-tune

the threshold for applications requiring higher precision.

Power on and

Low Voltage

Timer Reset

Generation

Watchdog

Timebase

TRIP

Reset &

Reset

thresholds are available, however,

Characteristics subject to change without notice.

detection circuitry protects the

falls below the minimum V

512 x 8 Bit

RESET/RESET

X5043 = RESET

X5045 = RESET

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