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| 型号： | TC1270ARBVCTTR |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | Voltage Supervisor with Manual Reset Input |
| 中文描述： | 电压监控器，带有手动复位输入 |
| 文件页数： | 17/40页 |
| 文件大小： | 384K |
| 代理商： | TC1270ARBVCTTR |
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2007 Microchip Technology Inc.
DS22035B-page 17
TC1270A/70AN/71A
4.0
DEVICE OPERATION
4.1
General Description
For many of today’s microcontroller applications, care
must be taken to prevent low-power conditions that can
cause many different system problems. The most
common causes are brown-out conditions, where the
system supply drops below the operating level
momentarily. The second most common cause is when
a slowly decaying power supply causes the microcon-
troller to begin executing instructions without sufficient
voltage to sustain volatile memory (RAM), thus
producing indeterminate results.
The TC127XA family (TC1270A, TC1270AN, and
TC1271A) are cost-effective voltage supervisor
devices designed to keep a microcontroller in Reset
until the system voltage has reached and stabilized at
the proper level for reliable system operation. These
devices also operate as protection from brown-out
conditions when the system supply voltage drops
below a safe operating level.
A Manual Reset input (MR pin) is provided. This allows
a push button switch to be directly connected to the
TC127XA device, and is suitable for use as a push
button Reset. This allows the system to easily be reset
from the external control of the push button switch. No
external components are required.
The Reset pin (RST or RST) will be forced active, if any
of the following occur:
During device power up
V
DD
goes below the device threshold voltage
The Manual Reset input (MR) goes low
Figure 4-1
shows a high level block diagram of the
devices. The device can be described with three
functional blocks. These are:
Voltage Detect circuit
Manual Reset with Glitch Filter circuit
Reset Generator circuit
The Reset Generator circuit controls the reset delay
time of the reset output signal.
There are three Reset Delay time options. Depending
on the option, the reset signal (RST/RST pin) will be
held active for a minimum of 1.09 ms, 17.5 ms, or
140 ms.
The TC1271A has an active-high RST output while the
TC1270A and TC1270AN have an active-low RST
output.
The TC1270A and TC1271A have a push-pull output
driver, while the TC1270AN has an open-drain output.
Figure 4-2
shows a typical circuit for a push-pull device
and
Figure 4-3
shows a typical circuit for an open-drain
device.
FIGURE 4-1:
Diagram.
TC127XA High Level Block
FIGURE 4-2:
Application Circuit.
Typical Push-Pull
FIGURE 4-3:
Application Circuit.
Typical Open-Drain
The TC1270A and TC1271A devices are available in a
4-Pin SOT-143 package to maintain footprint compati-
bility with the TC1270, TC1271, TCM811, and TCM812
devices, and the SOT-23-5 package. The TC1270AN is
only available in the SOT-23-5 package.
Low supply current makes these devices suitable for
battery powered applications.
Device specific block diagrams are shown in
Figure 4-4
through
Figure 4-6
.
V
DD
MR
RST
or
RST
Voltage
Detector
Circuit
Reset
Generator
Circuit
Manual Reset
with Glitch
Filter Circuit
VRST
MRRST
Push
Button
MR
V
SS
V
SS
V
DD
V
DD
Reset Input
TC1270A/1A
V
DD
0.1 μF
RST
or
RST
Push
Button
MR
V
SS
V
SS
V
DD
V
DD
RST
Reset Input
TC1270AN
V
DD
0.1 μF
相关PDF资料 |
PDF描述 |
|---|---|
| TC1270ARBVRCTR | Voltage Supervisor with Manual Reset Input |
| TC1270ARCVCTTR | Voltage Supervisor with Manual Reset Input |
| TC1270ARCVRCTR | Voltage Supervisor with Manual Reset Input |
| TC1270ARVCTTR | Voltage Supervisor with Manual Reset Input |
| TC1270ARVRCTR | Voltage Supervisor with Manual Reset Input |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1270ARBVRCTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1270ARCVCTTR | 功能描述:监控电路 Vltg Detector 2.63V Reset Threshold 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 |
| TC1270ARCVRCTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1270ARVCTTR | 功能描述:监控电路 5Pin uP Reset Mon 2.63V 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 |
| TC1270ARVRCTR | 功能描述:监控电路 4Pin uP Reset Mon 2.63V 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 |
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