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參數(shù)資料
| 型號： | TC1270ANLVRCTR |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Voltage Supervisor with Manual Reset Input |
| 中文描述： | 電壓監(jiān)控器，帶有手動(dòng)復(fù)位輸入 |
| 文件頁數(shù)： | 25/40頁 |
| 文件大?。?/td> | 384K |
| 代理商： | TC1270ANLVRCTR |
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2007 Microchip Technology Inc.
DS22035B-page 25
TC1270A/70AN/71A
5.6
Controllers and Processors With
Bidirectional I/O Pins
Some microcontrollers have bidirectional Reset pins.
Depending on the current drive capability of the
controller pin, an indeterminate logic level may result if
there is a logic conflict. This can be avoided by adding
a 4.7 k
Ω
resistor in series with the output of the
TC127XA (
Figure 5-7
). If there are other components
in the system that require a Reset signal, they should
be buffered so as not to load the Reset line. If the other
components are required to follow the Reset I/O of the
microcontroller, the buffer should be connected as
shown with the solid line.
FIGURE 5-7:
TC1271A Push-Pull Output to a Bidirectional
Reset I/O pin.
Interfacing the TC1270A or
5.7
Migration Paths
Figure 5-8
shows the 5-pin SOT-23 footprint of the
TC1270A, TC1270AN and TC1271A devices. Devices
that are in the 3-pin SOT-23 package could be used in
that circuit with the loss of the Manual Reset
functionality. Examples of compatible footprint devices
in the SOT-23-3 package are the MCP111, MCP112,
TC54, and TC51 devices. This allows the system to be
designed to offer a “base” functionality and a higher
end system with the “enhanced” functionality, which
includes a manual reset.
FIGURE 5-8:
Comparison.
SOT-23 5-pin to 3-pin
5.8
Reset Signal Integrity During
Power-Down
The TC1270A and TC1271A reset output is valid down
to V
DD
= 1.0V. Below this voltage the output becomes
an “open circuit” and does not sink current. This means
CMOS logic inputs to the Microcontroller will be floating
at an undetermined voltage. Most digital systems are
completely shut down well above this voltage.
However, in situations where the Reset signal must be
maintained valid to V
DD
= 0V, external circuitry is
required.
For devices where the Reset signal is active-low, a
pull-down resistor must be connected from the
TC1270A RST pin to ground to discharge stray
capacitances and hold the output low (
Figure 5-9
).
Similarly for devices where the Reset signal is
active-high, a pull-up resistor to V
DD
is required to
ensure a valid high RST signal for V
DD
below 1.0V
(
Figure 5-10
).
This resistor value, though not critical, should be
chosen such that it does not appreciably load the Reset
pin under normal operation (100 k
Ω
will be suitable for
most applications).
FIGURE 5-9:
Reset pin output state as
V
DD
approaches 0V.
Ensuring a valid active-low
FIGURE 5-10:
Reset pin output state as
V
DD
approaches 0V.
Ensuring a valid active-high
MR
V
SS
V
SS
V
DD
V
DD
RST
or
RST
Reset I/O
TC1270A/71A
V
DD
Buffered
Reset to
system
4.7 k
Ω
3
2
1
SOT-23-3
1
2
3
5
4
SOT-23-5
NC
V
DD
MR
RST
or
RST
V
SS
V
SS
V
DD
RST
or
RST
MR
V
SS
V
DD
RST
TC1270A
V
DD
R
1
100 k
Ω
MR
V
SS
V
DD
RST
TC1271A
V
DD
R
1
100 k
Ω
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| TC1270ANMBVCTTR | Voltage Supervisor with Manual Reset Input |
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| TC1270ANMCVCTTR | Voltage Supervisor with Manual Reset Input |
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| TC1270ANMVCTTR | Voltage Supervisor with Manual Reset Input |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1270ANMBVCTTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1270ANMBVRCTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1270ANMCVCTTR | 功能描述:監(jiān)控電路 Vltg Detector 4.38V Reset Threshold 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 |
| TC1270ANMCVRCTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1270ANMVCTTR | 功能描述:監(jiān)控電路 5Pin uP Reset Mon 4.38V Reset Thresh 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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