參數(shù)資料
型號(hào)： CAT1023WI-28-GT2
元件分類： EEPROM
英文描述： The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
中文描述： 該CAT24FC02是一個(gè)2 KB的EEPROM的國(guó)內(nèi)256個(gè)8位每字舉辦的串行CMOS
文件頁(yè)數(shù)： 7/21頁(yè)
文件大?。?/td> 278K
代理商： CAT1023WI-28-GT2
CAT1021, CAT1022, CAT1023
2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. 3009 Rev. L
DEVICE OPERATION
Reset Controller Description
The CAT1021/22/23 precision RESET controllers
ensure correct system operation during brownout and
power up/down conditions. They are configured with
open drain RESET outputs.
During power-up, the RESET outputs remain active
until V
CC
reaches the V
TH
threshold and will continue
driving the outputs for approximately 200ms (t
PURST
)
after reaching V
TH
. After the t
PURST
timeout interval, the
device will cease to drive the reset outputs. At this
point the reset outputs will be pulled up or down by
their respective pull up/down resistors.
During power-down, the RESET outputs will be active
when V
CC
falls below V
TH
. The ˉˉˉˉˉˉ output will be
valid so long as V
CC
is >1.0V (V
RVALID
). The device is
designed to ignore the fast negative going V
CC
transient pulses (glitches).
Reset output timing is shown in Figure 1.
Manual Reset Operation
The ˉˉˉˉˉˉ pin can operate as reset output and
manual reset input. The input is edge triggered; that
is, the ˉˉˉˉˉˉ input will initiate a reset timeout after
detecting a high to low transition.
When ˉˉˉˉˉˉ I/O is driven to the active state, the 200
msec timer will begin to time the reset interval. If
external reset is shorter than 200ms, Reset outputs
will remain active at least 200ms.
The CAT1021/22/23 also have a separate manual
reset input. Driving the ˉˉˉ input low by connecting a
pushbutton (normally open) from ˉˉˉ pin to GND will
generate a reset condition. The input has an internal
pull up resistor.
Reset remains asserted while ˉˉˉ is low and for the
Reset Timeout period after ˉˉˉ input has gone high.
Glitches shorter than 100ns on ˉˉˉ input will not ge-
nerate a reset pulse. No external debouncing circuits
are required. Manual reset operation using ˉˉˉ input
is shown in Figure 2.
Hardware Data Protection
The CAT1021/22/23 supervisors have been designed
to solve many of the data corruption issues that have
long been associated with serial EEPROMs. Data
corruption occurs when incorrect data is stored in a
memory location which is assumed to hold correct data.
Whenever the device is in a Reset condition, the
embedded EEPROM is disabled for all operations,
including write operations. If the Reset output(s) are
active, in progress communications to the EEPROM
are aborted and no new communications are allowed.
In this condition an internal write cycle to the memory
can not be started, but an in progress internal non-
volatile memory write cycle can not be aborted. An
internal write cycle initiated before the Reset condition
can be successfully finished if there is enough time
(5ms) before V
CC
reaches the minimum value of 2V.
In addition, the CAT1021 includes a Write Protection
Input which when tied to V
CC
will disable any write
operations to the device.
Watchdog Timer
The Watchdog Timer provides an independent
protection for microcontrollers. During a system
failure, CAT1021/22/23 devices will provide a reset
signal after a time-out interval of 1.6 seconds for a
lack of activity. The CAT1023 is designed with the
Watchdog timer feature on the WDI pin. The CAT1021
and CAT1022 monitor the SDA line. If WDI or SDA
does not toggle within a 1.6 second interval, the reset
condition will be generated on the reset outputs. The
watchdog timer is cleared by any transition on a
monitored line.
As long as reset signal is asserted, the watchdog
timer will not count and will stay cleared.
相關(guān)PDF資料
PDF描述
CAT1023WI-28-GT3 The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
CAT1023WI-28T2 The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
CAT1023WI-28T3 The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
CAT1023WI-30-GT2 The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
CAT1023WI-30-GT3 The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CAT1023WI-28-GT3 功能描述:監(jiān)控電路 CPU w/2K RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
CAT1023WI-28T2 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer
CAT1023WI-28-T2 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer
CAT1023WI-28T3 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer
CAT1023WI-28-T3 功能描述:監(jiān)控電路 CPU w/2K RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
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