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参数资料
| 型号： | CAT1022WI-30-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR CPU 2K EEPR 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： | 低有效 |
| 复位超时： | 最小为 130 ms |
| 电压 - 阀值： | 3V |
| 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) |
CAT1021, CAT1022, CAT1023
DEVICE OPERATON
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 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.
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 transient pulses
(glitches).
Reset output timing is shown in Figure 1.
Manual Reset Operation
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.
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.
The CAT1021/22/23 also have a separate manual reset
input. Driving the MR input low by connecting a pushbutton
(normally open) from MR pin to GND will generate a reset
condition. The input has an internal pull up resistor.
Reset remains asserted while MR is low and for the Reset
Timeout period after MR input has gone high.
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 nonvolatile 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.
Glitches shorter than 100 ns on MR input will not generate
a reset pulse. No external debouncing circuits are required.
Manual reset operation using MR input is shown in Figure 2.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT1022WI-30T2 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer |
| CAT1022WI-30-T2 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer |
| CAT1022WI-30T3 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer |
| CAT1022WI-30-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 |
| CAT1022WI-30TE13 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer |
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