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参数资料
| 型号： | TC1271TERC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封装： | SOT-143, 4 PIN |
| 文件页数： | 4/6页 |
| 文件大小： | 55K |
| 代理商： | TC1271TERC |
4
TC1270/1-1
9/15/99
4-PIN
P RESET MONITORS
TC1270
TC1271
Figure 3. Interfacing to Bidirectional Reset I/O
Processors With Bidirectional I/O Pins
Some
P's (such as Motorola 68HC11) have bi-direc-
tional reset pins. Depending on the current drive capability
of the processor pin, an indeterminate logic level may result
if there is a logic conflict. This can be avoided by adding a
4.7 k
resistor in series with the output of the TC1270/1
(Figure 3). If there are other components in the system which
require a reset signal, they should be buffered so as not to
load the reset line. If the other components are required to
follow the reset I/O of the
P, the buffer should be connected
as shown with the solid line.
RESET Signal Integrity During Power-Down
The TC1270 RESET output is valid to VCC = 1.0V.
Below this voltage the output becomes an "open circuit" and
does not sink current. This means CMOS logic inputs to the
P will be floating at an undetermined voltage. Most digital
systems are completely shutdown well above this voltage.
However, in situations where RESET must be maintained
valid to VCC = 0V, a pull-down resistor must be connected
from RESET to ground to discharge stray capacitances and
hold the output low (Figure 2). This resistor value, though not
critical, should be chosen such that it does not appreciably
load RESET under normal operation (100k
will be suitable
for most applications). Similarly, a pull-up resistor to VCC is
required for the TC1271 to ensure a valid high RESET for
VCC below 1.1V.
Figure 2. Ensuring RESET Valid to VCC = 0V
TC1270
VCC
R1
100k
RESET
GND
TC1270
VCC
RESET
GND
RESET
GND
BUFFERED RESET
TO OTHER SYSTEM
COMPONENTS
BUFFER
P
4.7k
VCC
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1271TERCTR | 功能描述:监控电路 4-Pin uP 38V Reset 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 |
| TC1272 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitors for 5V Systems |
| TC1272-10ENBTR | 功能描述:监控电路 3-Pin for 5V Systems 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 |
| TC1272-15ENBTR | 功能描述:监控电路 3-Pin for 5V Systems 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 |
| TC1272-5ENBTR | 功能描述:监控电路 3-Pin for 5V Systems 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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