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参数资料
| 型号： | TC1274-10ENBTR |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封装： | SOT-23B, 3 PIN |
| 文件页数： | 4/6页 |
| 文件大小： | 60K |
| 代理商： | TC1274-10ENBTR |
4
TC1272/3/4-1
9/9/99
3-PIN MONITORS FOR 5V SYSTEMS
TC1273
TC1274
TC1272
Figure 6. Ensuring RESET Valid to VCC = 0V
TC1272
VCC
R1
100k
RESET
GND
Figure 5. Maximum Transient Duration vs.
Overdrive for Glitch Rejection at 25
°C
RESET COMPARATOR OVERDRIVE,
[V
CCTP - VCC](mV)
500
300
200
400
100
0
1
10
100
1000
MAXIMUM
TRANSIENT
DURATION
(
sec)
TA = +25°C
VTH
Duration
Overdrive
VCC
TC1272/3/4
t
F
t
RPD2
V
CC
V
CCTP
(MAX)
V
OH
RESET
V
CCTP
V
CCTP
(MIN)
RESET SLEWS WITH V
CC
Figure 4. Timing Diagram: Power Down (TC1274)
VCC Transient Rejection
The TC1272/3/4 provides accurate VCC 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 5 shows the
maximum transient duration vs. maximum negative excur-
sion (overdrive) for glitch rejection. Any combination of
duration and overdrive which lies under the curve will not
generate a reset signal. Combinations above the curve are
detected as a brownout or power-down. Transient immunity
can be improved by adding a capacitor in close proximity to
the VCC pin of the TC1272/3/4.
RESET Signal Integrity During Power-Down
The TC1272 RESET output is valid to VCC = 1.2V.
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 6). 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
TC1274 to ensure a valid high RESET for VCC below 1.8V.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1274-15ENBTR | 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 |
| TC1274-5ENBTR | 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 |
| TC1275 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitors for 3.3V Systems |
| TC1275_07 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitors for 3.3V Systems |
| TC1275-10ENB | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitors for 3.3V Systems |
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