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| 型号： | CAT1025WI-42-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISR CPU 2K EEPROM 8SOIC |
| 标准包装： | 3,000 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 130 ms |
| 电压 - 阀值： | 4.25V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
CAT1024, CAT1025
DEVICE OPERATION
Reset Controller Description
The CAT1024/25 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 200 ms (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.
ˉˉˉˉˉˉ
During power-down, the RESET outputs will be active
when V CC falls below V TH . The RESET output will be
valid so long as V CC is >1.0 V (V RVALID ). The device is
designed to ignore the fast negative going V CC transi-
ent pulses (glitches).
Reset output timing is shown in Figure 1.
Manual Reset Operation
ˉˉˉˉˉˉ
ˉˉˉˉˉˉ
The RESET pin can operate as reset output and
manual reset input. The input is edge triggered; that
is, the RESET input will initiate a reset timeout after
detecting a high to low transition.
ˉˉˉˉˉˉ
When RESET I/O is driven to the active state, the
200 ms timer will begin to time the reset interval. If
external reset is shorter than 200 ms, Reset outputs
will remain active at least 200 ms.
MR
The CAT1024/25 also have a separate manual reset
input. Driving the ˉˉˉ input low by connecting a
MR
pushbutton (normally open) from ˉˉˉ pin to GND will
generate a reset condition. The input has an internal
pull up resistor.
MR
MR
MR
MR
Reset remains asserted while ˉˉˉ is low and for the
Reset Timeout period after ˉˉˉ input has gone high.
Glitches shorter than 100 ns 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 CAT1024/25 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
(5 ms) before V CC reaches the minimum value of 2 V.
In addition, the CAT1025 includes a Write Protection
Input which when tied to V CC will disable any write
operations to the device.
? 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
7
Doc. No. MD-3008 Rev. R
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| CAT1025WI-42-T3 | 功能描述:监控电路 CPU w/2K RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| CAT1025WI45 | 功能描述:监控电路 CPU w/2K RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| CAT1025WI-45-G | 功能描述:监控电路 CPU w/2K RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| CAT1025WI-45-GT3 | 功能描述:监控电路 CPU w/2K RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| CAT1025WI-45-T3 | 功能描述:监控电路 CPU w/2K RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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