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| 型号： | MCP1318MT-46LE/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 33/52页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR 4.6V OD/PP SOT23-5 |
| 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，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.6V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
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MCP131X/2X
4.3
Negative Going V DD Transients
4.4
Manual Reset Input
The minimum pulse width (time) required to cause a
Reset may be an important criteria in the
implementation of a Power-on Reset (POR) circuit.
This time is referred to as transient duration. The
MCP131X/2X devices are designed to reject a level of
negative-going transients (glitches) on the power
supply line.
Transient duration is the amount of time needed for
these supervisory devices to respond to a drop in V DD .
The transient duration time (t TRAN ) is dependant on the
magnitude of V TRIP – V DD (overdrive). Any combination
of duration and overdrive that lies under the
duration/overdrive curve will not generate a Reset
signal. Generally speaking, the transient duration time
decreases with and increases in the V TRIP – V DD
voltage. Combinations of duration and overdrive that lie
above the duration/overdrive curve are detected as a
brown-out or power-down condition.
Reset comparator overdrive, for which the
MCP131X/2X will not generate a Reset pulse. It shows
The Manual Reset input pin (MR) allows the Reset pins
(RST/RST) to be manually forced to their active states.
The MR pin has circuitry to filter noise pulses that may
be present on the pin. Figure 4-17 shows a block
diagram for using the MCP131X/2X with a push-button
switch. To minimize the required external components,
the MR input has an internal pull-up resistor.
A mechanical push button or active logic signal can
drive the MR input.
Once MR has been low for a time, t MRD (the Manual
Reset delay time), the Reset output pins are forced
active. The Reset output pins will remain in their active
states for the Reset delay timer time out period (t R ST ).
switch input and the Reset pins output.
+5V
V DD
that the farther below the trip point the transient pulse
MR
WDI
I/O
goes, the duration of the pulse required to cause a
Reset gets shorter. Figure 4-16 shows the transient
response characteristics for the MCP131X/2X.
Transient immunity can be improved by adding a
bypass capacitor (typically 0.1 μF) as close as possible
to the V DD pin of the MCP131X/2X device.
MCP13XX
RST
V SS
PIC ? MCU
MCLR
FIGURE 4-17:
Push Button Reset and
5V
V TRIP(MIN) - V DD
(Overdrive)
V TRIP(MAX)
V TRIP(MIN)
Watchdog Timer.
t MR
t TRANS
(Duration)
MR
t MRD
V IH
0V
Time (μs)
V IL
t RST
FIGURE 4-16: Example of Typical
Transient Duration Waveform.
RST
RST
The MR input typically ignores input pulses
of 100 ns.
FIGURE 4-18:
MR Input – Push Button.
4.4.1
NOISE FILTER
The noise filter filters out noise spikes (glitches) on the
Manual Reset pin (MR). Noise spikes less than 100 ns
(typical) are filtered.
? 2005-2012 Microchip Technology Inc.
DS21985C-page 33
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| MCP1318T | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor |
| MCP1318T-29HE/OT | 功能描述:监控电路 ACTIVE LOW/HIGH P-P WDI 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 |
| MCP1318T-29LE/CH | 功能描述:监控电路 WDI Active Lo P-P Active HI P-P 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 |
| MCP1318T-29LE/OT | 功能描述:监控电路 Active low P-P 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 |
| MCP1318T-46LE/OT | 功能描述:监控电路 Active low P-P 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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