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| 型号： | TC1271TERCTR |
| 厂商： | Microchip Technology |
| 文件页数： | 6/14页 |
| 文件大小： | 0K |
| 描述： | IC RESET MONITOR 3.08V SOT143-4 |
| 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： | 推挽式，图腾柱 |
| 复位： | 高有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 3.08V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-253-4，TO-253AA |
| 供应商设备封装： | SOT-143 |
| 包装： | 带卷 (TR) |
TC1270/TC1271
4.0
4.1
APPLICATIONS INFORMATION
V CC Transient Rejection
be connected from RESET to ground to discharge stray
capacitances and hold the output low ( Figure 4-2 ). This
resistor value, though not critical, should be chosen
such that it does not appreciably load RESET under
The TC1270/TC1271 provides accurate V CC
monitoring and Reset timing during power-up,
power-down, and brownout/sag conditions, and rejects
negative-going transients (glitches) on the power
supply line. Figure 4-3 shows the maximum transient
duration vs. maximum negative excursion (overdrive)
for glitch rejection. 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. Transient
immunity can be improved by adding a capacitor in
close proximity to the V CC pin of the TC1270/TC1271.
normal operation (100 k Ω will be suitable for most
applications). Similarly, a pull-up resistor to V CC is
required for the TC1271 to ensure a valid high RESET
for V CC below 1.1V.
V CC
V CC
TC1270
RESET
V CC
R1
V TH
Overdrive
GND
100k
Duration
FIGURE 4-2:
V CC = 0V.
Ensuring RESET Valid to
400
T A = +25°C
4.3
Processors With Bidirectional
I/O Pins
320
240
160
Some microprocessors (such as Motorola’s 68HC11)
have bidirectional Reset pins. Depending on the
current drive capability of the processor pin, an indeter-
minate logic level may result if there is a logic conflict.
This can be avoided by adding a 4.7 k Ω resistor in
series with the output of the TC1270/TC1271
80
0
TC127LMJ
TC127xR/S/T
tem which require a Reset signal, they should be buff-
ered so as not to load the Reset line. If the other
components are required to follow the Reset I/O of the
microprocessor, the buffer should be connected as
1
10
100
1000
shown with the solid line.
RESET COMPARATOR OVERDRIVE,
V TH - V CC (mV)
Buffered RESET
FIGURE 4-1:
Maximum Transient
Buffer
To Other System
Components
Duration vs. Overdrive for Glitch Rejection at
+25°C.
V CC
V CC
V CC
4.2
Reset Signal Integrity During
Power-Down
TC1270
RESET
4.7k
μ P
RESET
The TC1270 RESET output is valid to V CC = 1.0V.
Below this voltage the output becomes an “open circuit”
and does not sink current. This means CMOS logic
inputs to the microprocessor will be floating at an
undetermined voltage. Most digital systems are
completely shut down well above this voltage.
However, in situations where RESET must be
maintained valid to V CC = 0V, a pull-down resistor must
DS21381D-page 6
GND
FIGURE 4-3:
Reset I/O.
GND
Interfacing to Bidirectional
? 2007 Microchip Technology Inc.
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| 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 |
| TC1272A | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitor |
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