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| 型号： | TC1271ALCVCTTR |
| 厂商： | Microchip Technology |
| 文件页数： | 23/48页 |
| 文件大小： | 0K |
| 描述： | IC RESET MONITOR 4.63V SOT23A-5 |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 高有效 |
| 复位超时： | 最小为 17.5 ms |
| 电压 - 阀值： | 4.63V |
| 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： | 标准包装 |
| 产品目录页面： | 662 (CN2011-ZH PDF) |
| 其它名称： | TC1271ALCVCTDKR |
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TC1270A/70AN/71A
4.3
Negative-Going V DD Transients
4.4
Manual Reset with Glitch Filter
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
TC127XA 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 dependent 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 an increase in the V TRIP – V DD voltage.
Reset comparator overdrive. It shows that the farther
below the trip point the transient pulse goes, the shorter
the duration of the pulse required to cause a Reset
gets. So, any combination of duration and overdrive
that lays under the curve will not generate a Reset
signal. Combinations above the curve are detected as
a brown-out or power-down.
Circuit
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 4-10 shows a block
diagram for using the TC127XA 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 MD (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 RST ).
switch input and the Reset pins output.
+5V
V DD
MR
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 TC127XA device.
TC127XA
RST
V SS
PIC ? MCU
MCLR
5V
V TRIP(MIN) - V DD
V TRIP(MAX)
V TRIP(MIN)
FIGURE 4-10:
Push Button Reset.
(Overdrive)
t TRAN (Duration)
t MR
0V
Time (μs)
MR
t MD
V IH
Area above curve will
generate a Reset signal
Area below curve will
not generate a Reset signal
RST
RST
V IL
t RST
The MR input typically ignores input pulses
of 100 ns.
Transient Overdrive Voltage (mV)
FIGURE 4-11:
MR Input – Push Button.
FIGURE 4-9: Example of Typical
Transient Duration Waveform.
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.
? 2007-2011 Microchip Technology Inc.
DS22035D-page 23
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1271ALCVRCTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1271ALVCTTR | 功能描述:监控电路 5Pin uP Reset Mon 4.63V Reset Thresh 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 |
| TC1271ALVRCTR | 功能描述:监控电路 4Pin uP Reset Mon 4.63V Reset Thresh 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 |
| TC1271AMBVCTTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1271AMBVRCTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
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