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参数资料
| 型号： | CAT1027ZI-45-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR CPU 2K EEPR 8MSOP |
| 标准包装： | 3,000 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 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： | 4.5V，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
CAT1026, CAT1027
DEVICE OPERATON
Reset Controller Description
The CAT1026 and CAT1027 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 Capability
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.
Monitoring Two Voltages
The CAT1026 and CAT1027 feature a second voltage
sensor, V SENSE , which drives the open drain V LOW output
low whenever the input voltage is below 1.25 V. The
auxiliary voltage monitor timing is shown in Figure 2.
By using an external resistor divider the sense circuitry
can be set to monitor a second supply in the system. The
circuit shown in Figure 3 provides an externally adjustable
Data Protection
The CAT1026 and CAT1027 devices 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 (5 ms) before V CC reaches the minimum value
of 2 V.
In addition, to avoid data corruption due to the loss of
power supply voltage during the memory internal write
operation, the system controller should monitor the
unregulated DC power. Using the second voltage sensor,
V SENSE , to monitor an unregulated power supply, the
CAT1026 and CAT1027 signals an impending power failure
by setting V LOW low.
Watchdog Timer
The Watchdog Timer provides an independent protection
for microcontrollers. During a system failure, the CAT1027
device will provide a reset signal after a time ? out interval of
1.6 seconds for a lack of activity. CAT1027 is designed with
the Watchdog timer feature on the WDI pin. If WDI does not
toggle within 1.6 second intervals, the reset condition will be
generated on reset output. The watchdog timer is cleared by
any transition on monitored line.
As long as reset signal is asserted, the watchdog timer will
not count and will stay cleared.
threshold voltage, V TH_ADJ to monitor the auxiliary voltage.
The low leakage current at V SENSE allows the use of large
value resistors, to reduce the system power consumption.
The V LOW output can be externally connected to the RESET
output to generate a reset condition when either of the
supplies is invalid. In other applications, V LOW signal can be
used to interrupt the system controller for an impending
power failure notification.
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| CAT1027ZI-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 |
| CAT102EUK-TE7 | 功能描述:基准电压& 基准电流 600mV w/Open Colectr RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| CAT102TBI-GTE7 | 功能描述:直流/直流开关转换器 600mV Adj RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| CAT102TDI-GT3 | 功能描述:直流/直流开关转换器 Prec,Adj Shunt Reg 600mV RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| CAT10-300J4 | 功能描述:电阻器网络与阵列 30ohm 5% Concave 4resistors RoHS:否 制造商:Vishay/Thin Film 产品类型:Networks 电路类型:Divider 电阻器数量: 电阻数值:10 kOhms 容差:0.1 % 温度系数: 管脚数量:3 工作温度范围:- 55 C to + 155 C 尺寸:1.02 mm W x 3.05 mm L x 1.4 mm H 引线间隔: 端接类型:SMD/SMT 封装:Reel |
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