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參數(shù)資料
| 型號(hào)： | NCP803SN263T1 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 電源管理 |
| 英文描述： | Very Low Supply Current 3-Pin Microprocessor Reset Monitor |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封裝： | TO-236, SOT-23, 3 PIN |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 55K |
| 代理商： | NCP803SN263T1 |
NCP803
http://onsemi.com
4
APPLICATIONS INFORMATION
V
CC
Transient Rejection
The NCP803 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 2 shows the maximum
transient duration vs. maximum negative excursion
(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. Typically, transient
that goes 100 mV below the reset threshold and lasts 5
μ
s or
less will not cause a reset pulse. Transient immunity can be
improved by adding a capacitor in close proximity to the V
CC
pin.
Figure 2. Maximum Transient Duration vs. Overdrive
for Glitch Rejection at 25
°
C
Duration
V
TH
Overdrive
V
CC
10
250
200
40
30
M
μ
s
50
300
RESET COMPARATOR OVERDRIVE (mV)
0
60
150
100
20
50
70
80
90 100
V
TH
= 3.08 V
V
TH
= 1.6 V
V
TH
= 4.9 V
Processors With Bidirectional I/O Pins
Some
μ
P’s (such as Motorola 68HC11) have
bi-directional reset pins which interface easily with the
Open Drain RESET output of the NCP803. As shown in
Figure 3, one can connect directly to the RESET output of
the NCP803 to the RESET pin of the
μ
P. The pull-up resistor
avoids an undetermined voltage of the RESET pin.
Figure 3. Interfacing to Bidirectional Reset I/O
V
CC
V
CC
V
CC
RESET
RESET
NCP803
GND
GND
μ
P
0
0
R
pull- up
C = 100 nF
NCP803 RESET Output Allows Use With Two Power
Supplies
In numerous applications the pull-up resistor placed on
the RESET output is connected to the supply voltage
monitored by the IC. Nevertheless, a different supply
voltage can also power this output and so level-shift from
the monitored supply to reset the
μ
P. However, if the
NCP803’s supply goes below 1 V, the RESET
output ability
to sink current will decrease and the result is a high state on
the pin even though the supply’s IC is under the threshold
level. This occurs at a V
CC
level that depends on the R
pull-up
value and the voltage to which it is connected.
Figure 4. RESET Output with Two Power Supplies
V
CC
V
CC
RESET
RESET
NCP803
GND
GND
μ
P
0
0
R
pull- up
C = 100 nF
+3.3 V
+5.0 V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP803SN263T1G | 功能描述:監(jiān)控電路 2.63V 20mA 3-Pin w/uP Reset N-Channel 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 |
| NCP803SN263T1G | 制造商:ON Semiconductor 功能描述:Voltage Detector / Microprocessor Superv |
| NCP803SN293D1T1G | 功能描述:監(jiān)控電路 ANA 2.93V MCROPROC RESET 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 |
| NCP803SN293D2T1G | 功能描述:監(jiān)控電路 ANA 2.93V MCROPROC RESET 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 |
| NCP803SN293D3T1G | 功能描述:監(jiān)控電路 ANA 2.93V MCROPROC RESET 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 |
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