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| 型号： | TC1277-5ENB |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | 3-Pin Reset Monitors for 3.3V Systems |
| 中文描述： | 3引脚复位监控器为3.3V系统 |
| 文件页数： | 5/12页 |
| 文件大小： | 456K |
| 代理商： | TC1277-5ENB |
2007 Microchip Technology Inc.
DS21383C-page 5
TC1275/TC1276/TC1277
3.2
V
CC
Transient Rejection
The TC1275/TC1276/TC1277 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 3-5
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. Transient
immunity can be improved by adding a capacitor in
close proximity to the V
CC
pin of the TC1275/TC1276/
TC1277.
3.3
RESET Signal Integrity During
Power-Down
The TC1275 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 3-6
). This resistor value,
though not critical, should be chosen such that it does
not appreciably load RESET under normal operation
(100 k
Ω
will be suitable for most applications). Simi-
larly, a pull-up resistor to V
CC
is required for the
TC1277 to ensure a valid high RESET for V
CC
below
1.8V.
FIGURE 3-5:
Duration Vs. Overdrive For Glitch Rejection At
+25°C.
Maximum Transient
FIGURE 3-6:
TO V
CC
= 0V.
ENSURING RESET VALID
RESET COMPARATOR OVERDRIVE,
[
V
CCTP
- V
CC
]
(mV)
500
300
200
400
100
0
1
10
100
1000
μ
s
T
A
°
C
V
TH
Duration
Overdrive
V
CC
TC1275/6/7
TC1275
V
CC
V
CC
R1
100k
RESET
GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1277-5ENBTR | 功能描述:监控电路 3-Pin for 3.3V Syst 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 |
| TC1277-XENB | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitors for 3.3V Systems |
| TC1278 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitors for 5V Systems |
| TC1278_07 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitors for 5V Systems |
| TC1278-10ENB | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Reset Monitors for 5V Systems |
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