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| 型号： | MCP121T-270E/TT |
| 厂商： | Microchip Technology |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR 2.63V LOW SOT-23B |
| 标准包装： | 1 |
| 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 80 ms |
| 电压 - 阀值： | 2.63V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 标准包装 |
| 产品目录页面： | 661 (CN2011-ZH PDF) |
| 其它名称： | MCP121T-270E/TTDKR |
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MCP102/103/121/131
4.2
Negative Going V DD Transients
4.3
Reset Power-up Timer (t RPU )
The minimum pulse width (time) required to cause a
reset may be an important criteria in the implementa-
tion of a Power-on Reset (POR) circuit. This time is
referred to as transient duration, defined as the amount
of time needed for these supervisory devices to
respond to a drop in V DD . The transient duration time is
dependant on the magnitude of V TRIP – V DD . Generally
speaking, the transient duration decreases with
increases in V TRIP – V DD .
comparator overdrive, for which the
MCP102/103/121/131 will not generate a reset pulse. It
shows that the farther below the trip point the transient
pulse goes, the duration of the pulse required to cause
a reset gets shorter. Figure 2-32 shows the transient
response characteristics for the MCP102/103/121/131.
the system is powering down, the device has a low
current. This current is dependent on the device V DD
and trip point. When the device V DD rises through the
voltage trip point (V TRIP ), an internal timer starts. This
timer consumes additional current until the RST pin is
driven (or released) high. This time is known as the
Reset Power-up Time (t RPU ). Figure 4-4 shows when
t RPU is active (device consuming additional current).
V DD
V TRIP
A 0.1 μF bypass capacitor, mounted as close as
possible to the V DD pin, provides additional transient
immunity (refer to Figure 4-1).
RST
t RPU
5V
V TRIP(MIN) - V DD
V TRIP(MAX)
V TRIP(MIN)
Reset
Power-up
Reset Power-up
Timer
t TRANS
0V
Time (μs)
FIGURE 4-3: Example of Typical
Transient Duration Waveform.
Timer Inactive
See Figures 2-1,
Inactive
See Figures 2-1,
See Figures 2-4,
FIGURE 4-4:
Waveform.
Reset Power-up Timer
4.3.1
EFFECT OF TEMPERATURE ON
RESET POWER-UP TIMER (T RPU )
The Reset Power-up timer time-out period (t RPU )
determines how long the device remains in the reset
condition. This is affected by both V DD and temperature.
Typical responses for different V DD values and
temperatures are shown in Figures 2-26, 2-27 and 2-28.
? 2005 Microchip Technology Inc.
DS21906B-page 13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP121T-270I/LB | 功能描述:监控电路 Open Drain Low 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 |
| MCP121T-270I/TO | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Micropower Voltage Supervisors |
| MCP121T-270I/TT | 功能描述:监控电路 Open Drain Low 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 |
| MCP121T-300E/LB | 功能描述:监控电路 Open Drain Low 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 |
| MCP121T-300E/LBG | 功能描述:监控电路 Open Drain Low Lead Free Package 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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