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| 型号： | TC1272ATVNBTR |
| 厂商： | Microchip Technology |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC RESET MONITOR 3.08V SOT-23B |
| 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： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 3.08V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 带卷 (TR) |
TC1272A
3.0
3.1
APPLICATIONS INFORMATION
V DD Transient Rejection
Combinations above the curve are detected as a
brown-out or power-down condition. Transient immu-
nity can be improved by adding a capacitor in close
proximity to the V DD pin of the TC1272A.
The TC1272A provides accurate V DD monitoring and
reset timing during power-up, power-down and brown-
out/sag conditions. These devices also reject negative-
going transients (glitches) on the power supply line.
3.2
RESET Signal Integrity During
Power-Down
maximum negative excursion (overdrive) for glitch
rejection. Any combination of duration and overdrive
that lies under the curve will not generate a reset
signal.
The TC1272A RESET output is valid to V DD = 1.0V.
Below this voltage, the output becomes an "open cir-
cuit" and does not sink current. This means CMOS
logic inputs to the microcontroller will be floating at an
undetermined voltage. Most digital systems are com-
pletely shut down well above this voltage. However, in
400
V DD
Duration
V TH
Overdrive
situations where RESET must be maintained valid to
V DD = 0V, a pull-down resistor must be connected from
RESET to ground to discharge stray capacitances and
hold the output low (Figure 3-2). 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).
320
240
160
T A = +25°C
V DD
V DD
TC1272A
80
TC1272A /L/M/J
RESET
0
TC1272A /Z/R/S/T
1 5
100
1000
GND
R 1
100 k ?
Reset Comparator Overdrive
[V TH - V DD ] (mv)
130
120
110
100
90
80
70
60
50
40
30
TC1272A /L/M/J
TC1272A /Z/R/S/T
FIGURE 3-2: The addition of R 1 at the
RESET output of the TC1272A ensures that the
RESET output is valid to V DD = 0V.
1
10
100
1000
Reset Comparator Overdrive (mV)
[V TH - V DD ] (mv)
FIGURE 3-1:
Maximum Transient
Duration vs. Overdrive for Glitch Rejection at
+25°C.
DS21877A-page 4
? 2004 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1272AZVNBTR | 功能描述:监控电路 3-Pin Reset Monitor 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 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitors for 5V Systems |
| 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 |
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