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參數(shù)資料
| 型號(hào)： | TS3809CXBRF |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封裝： | ROHS COMPLIANT, SOT-23, 3 PIN |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 254K |
| 代理商： | TS3809CXBRF |
TS3809/3810 Series
Microprocessor Reset Circuit
4/7
Version: C07
Application Information
Negative-Going VCC transients in addition to issuing a reset to the P during power-up, power-down, and brownout
conditions, the TS3809/3810 are relatively immune to short-duration negative-going Vcc transients (glitches).
The TS3809/3810 do not generate a reset pulse. The graph was generated using a negative going pulse applied to
Vcc, starting 0.5V above the actual reset threshold and ending below it by the magnitude indicated (reset comparator
overdrive). The graph indicates the maximum pulse width a negative going Vcc transient can have without causing a
reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum
allowable pulse width decreases. Typically, a Vcc transient that goes 100mV below the reset threshold and lasts
20S or less will not cause a reset pulse. A 0.1F bypass capacitor mounted as close as possible to the Vcc pin
provides additional transient immunity.
Function Description
A microprocessor’s (P’s) reset input starts the P In a know state. The TS3809/3810 assert reset to prevent code-
execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the Vcc
supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after Vcc has risen above
the reset threshold. The TS3809/3810 have a push-pull output stage.
Ensuring a Valid Reset Output Down to Vcc=0
RESET is guaranteed to be a logic low for VCC > 1.0V. Once VCC exceeds the reset threshold, an internal timer
keeps RESET low for the reset timeout period; after this interval, RESET goes high. If a brownout condition occurs
(VCC dips below the reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal
timer resets to zero, and RESET goes low. The internal timer starts after VCC returns above the reset threshold, and
RESET remains low for the reset timeout period. When Vcc falls below 1V, the TS3809/3810 reset output no longer
sinks current - it becomes an open circuit. Therefore, high impedance CMOS logic input connected to reset can drift
to undetermined voltages. This present no problem in most applications since most P and other circuitry is
inoperative with Vcc below 1V.However, in applications where reset must be valid down to 0V, adding a pull down
resistor to reset causes and stray leakage currents to flow to ground, holding reset low (Figure 2.) R1’s value is not
critical; 100K is large enough not to load reset and small enough to pull RESET to ground. For the TS3809/3810 if
reset is required to remain valid for Vcc<1V.
Benefits of Highly Accurate Reset Threshold
Most P supervisor ICs has reset threshold voltages between 5% and 10% below the value of nominal supply
voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10%
below nominal. When using ICs rated at only the nominal supply ±5%, this leaves a zone of uncertainty where the
supply is between 5% and 10% low, and where the reset many or may not be asserted
Timming Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS3809CXC | 功能描述:監(jiān)控電路 uP Supervisory,Act Low RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)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 |
| TS3809CXD | 功能描述:監(jiān)控電路 uP Supervisory,Act Low RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)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 |
| TS3809CXE | 功能描述:監(jiān)控電路 uP Supervisory,Act Low RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)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 |
| TS3809CXF | 功能描述:監(jiān)控電路 uP Supervisory,Act Low RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)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 |
| TS3809CXG | 功能描述:監(jiān)控電路 uP Supervisory,Act Low RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)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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