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參數(shù)資料
| 型號： | TC1277-10ENBTR |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封裝： | PLASTIC, SOT-23, 3 PIN |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 503K |
| 代理商： | TC1277-10ENBTR |
2007 Microchip Technology Inc.
DS21383C-page 5
TC1275/TC1276/TC1277
3.2
VCC Transient Rejection
The TC1275/TC1276/TC1277 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 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 VCC pin of the TC1275/TC1276/
TC1277.
3.3
RESET Signal Integrity During
Power-Down
The TC1275 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
μP 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
VCC = 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 VCC is required for the
TC1277 to ensure a valid high RESET for VCC below
1.8V.
FIGURE 3-5:
Maximum Transient
Duration Vs. Overdrive For Glitch Rejection At
+25°C.
FIGURE 3-6:
ENSURING RESET VALID
TO VCC = 0V.
RESET COMPARATOR OVERDRIVE,
[V
CCTP - VCC] (mV)
500
300
200
400
100
0
1
10
100
1000
MAXIMUM
TRANSIENT
DURATION
(
μ
sec)
TA
°C
VTH
Duration
Overdrive
VCC
TC1275/6/7
TC1275
VCC
R1
100k
RESET
GND
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| TC1277-15ENB | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:3-Pin Reset Monitors for 3.3V Systems |
| TC1277-20ENBTR | 功能描述:監(jiān)控電路 3-Pin for 3.3V Syst RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TC1277-5ENB | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:3-Pin Reset Monitors for 3.3V Systems |
| TC1277-5ENBTR | 功能描述:監(jiān)控電路 3-Pin for 3.3V Syst RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TC1277-XENB | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:3-Pin Reset Monitors for 3.3V Systems |
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