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参数资料
| 型号： | TC1273 |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | 3-Pin Reset Monitors for 5V Systems |
| 中文描述： | 3引脚复位监控器的5V系统 |
| 文件页数： | 6/12页 |
| 文件大小： | 221K |
| 代理商： | TC1273 |
TC1272/TC1273/TC1274
DS21382B-page 6
2003 Microchip Technology Inc.
4.2
V
CC
Transient Rejection
The TC1272/TC1273/TC1274 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 4-5 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 brownout or power-down condition.
Transient immunity can be improved by adding a
capacitor in close proximity to the V
CC
pin of the
TC1272/TC1273/TC1274.
4.3
RESET Signal Integrity During
Power-Down
The TC1272 RESET output is valid to V
CC
= 1.2V.
Below this voltage the output becomes an "open
circuit" and does not sink current. This means CMOS
logic inputs to the
μ
P will be floating at an undeter-
mined voltage. Most digital systems are completely
shut down well above this voltage. However, in situa-
tions where RESET must be maintained valid to
V
CC
= 0V, a pull-down resistor must be connected from
RESET to ground to discharge stray capacitances and
hold the output low (Figure 4-6). This resistor value,
though not critical, should be chosen such that it does
not appreciably load RESET under normal operation
(100 k
will be suitable for most applications). Simi-
larly, a pull-up resistor to V
CC
is required for the
TC1274 to ensure a valid high RESET for V
CC
below
1.8V.
FIGURE 4-5:
Duration vs. Overdrive For Glitch Rejection At
+25°C.
Maximum Transient
FIGURE 4-6:
V
cc
= 0V.
Ensuring Reset Valid To
RESET COMPARATOR OVERDRIVE,
[V
CCTP
-V
CC
] (mV)
500
300
200
400
100
0
1
10
100
1000
M
T
A
= +25°C
V
TH
Duration
Overdrive
V
CC
TC1272/3/4
TC1272
V
CC
V
CC
R
1
100 k
RESET
GND
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| TC1274 | 3-Pin Reset Monitors for 5V Systems |
| TC1272 | 3-Pin Reset Monitors for 5V Systems |
| TC1277-15ENB | 3-Pin Reset Monitors for 3.3V Systems |
| TC1275-10ENB | 3-Pin Reset Monitors for 3.3V Systems |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1273-10ENBTR | 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 |
| TC1273-15ENBTR | 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 |
| TC1273-5ENBTR | 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 |
| TC1274 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitors for 5V Systems |
| TC1274-10ENBTR | 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 |
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