Datasheet > X4285

X4285

更新时间： 2024-01-06 15:25:48

品牌	Logo	应用领域
英特矽尔 - INTERSIL		监控可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数	文件大小	规格书
22页	344K
描述
CPU Supervisor with 128K EEPROM

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数据手册

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X4285 数据手册

X4283, X4285

128K, 16K x 8 Bit

Data Sheet

May 23, 2006

FN8121.1

DESCRIPTION

CPU Supervisor with 128K EEPROM

The X4283, X4285 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.

FEATURES

• Selectable watchdog timer

• Low V detection and reset assertion

—Four standard reset threshold voltages

—Adjust low V reset threshold voltage using

special programming sequence

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.

—Reset signal valid to V = 1V

• Low power CMOS

—<20µA max standby current, watchdog on

—<1µA standby current, watchdog OFF

—3mA active current

• 128Kbits of EEPROM

—64 byte page write mode

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.

—Self-timed write cycle

—5ms write cycle time (typical)

• Built-in inadvertent write protection

—Power-up/power-down protection circuitry

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

bytes of EEPROM array with programmable

The device’s low V

detection circuitry protects the

user’s system from low voltage conditions, resetting

the system when V falls below the set minimum V

™

Block Lock protection

• 400kHz 2-wire interface

• 2.7V to 5.5V power supply operation

• Available packages

—8 Ld SOIC

—8 Ld TSSOP

trip point. RESET/RESET is asserted until V returns

to proper operating level and stabilizes. Four industry

standard Vtrip thresholds are available, however, Inter-

sil’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.

• Pb-free plus anneal available (RoHS compliant)

BLOCK DIAGRAM

Watchdog Transition

Detector

Watchdog

Timer Reset

Protect Logic

RESET (X4283)

RESET (X4285)

Data

SDA

Status

EEPROM Array

Command

Reset &

Watchdog

Timebase

SCL

Decode &

Control

Logic

V_CCThreshold

Reset logic

Power-on and

Low Voltage

V_CC

Reset

Kb=Kilobyte

Generation

V_TRIP

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

1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

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

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与X4285相关器件

型号	品牌	获取价格	描述	数据表
X4285AL	XICOR	获取价格	CPU Supervisor with 128K EEPROM
X4285AM	XICOR	获取价格	CPU Supervisor with 128K EEPROM
X4285AN	XICOR	获取价格	CPU Supervisor with 128K EEPROM
X4285AP	XICOR	获取价格	CPU Supervisor with 128K EEPROM
X4285F	XICOR	获取价格	CPU Supervisor with 128K EEPROM
X4285G	XICOR	获取价格	CPU Supervisor with 128K EEPROM
X4285I	XICOR	获取价格	CPU Supervisor with 128K EEPROM
X4285S8	XICOR	获取价格	CPU Supervisor with 128K EEPROM
X4285S8	INTERSIL	获取价格	CPU Supervisor with 128K EEPROM
X4285S8-2.7	XICOR	获取价格	CPU Supervisor with 128K EEPROM

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