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參數(shù)資料
| 型號： | TL7702 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Supply voltage Supervisor |
| 中文描述： | 電源電壓監(jiān)控 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大小： | 340K |
| 代理商： | TL7702 |
Circuit
Description
4
Literature Number: SLVAE04
An additional comparator compares the voltage at the capacitor with the reference voltage and forces the
outputs into the active state as long as the voltage at the capacitor is lower than the reference voltage.
Figure 4 shows the timing of the various signals. In this example the SENSE input is connected to the
supply voltage V
as in typical applications of this device. The minimum supply voltage for which the
function of this device is guaranteed is 3.6 V. After power-on the outputs are undefined until the minimum
supply voltage V
is reached. For the TL77xxA the minimum supply voltage is V
= 3.0 V (typical 2.5 V),
for the TL77xxB is V
= 1.0 V. Also, when using the TL77xxB it has to be noted, that with such low supply
voltages the function of the reset input of the following circuit may not be guaranteed.
Beyond the voltage V
the capacitor C
is first kept discharged, and the outputs stay in the active
state(RESET = High, RESET = Low). When the input voltage becomes higher than the threshold voltage
V
, the thyristor is turned off and the capacitor is charged. After a delay, t
, the voltage at the capacitor
passes the trigger level of the output comparator and the outputs become inactive. The circuit to be
initialized is now set to a defined state and starts the correct operation.
Note: SENSE Input connected to V
cc
Figure 4. Timing diagram
The thyristor is triggered again during voltage drops below the threshold voltage V
. and the reset
sequence starts again. Also now the outputs stays in the active state for the time t
after the return of the
supply voltage to its required value. A hysteresis V
h
at the input comparator prevents oscillation of the input
circuit when the input voltage rises or falls slowly.
The time t
- and also the capacitor C
- are determined by the requirements of the following circuitry. In
TTL or CMOS logic circuits, theoretically a reset time of 20 to 50ns is sufficient. For proper operation,
microcomputers require a reset signal which lasts for several machine cycles and is thus of the order of 10
to 200
μ
s, according to the type of microcomputer in use. In a practical application, the delay time will be
determined by characteristics of the power supply. Care has to be taken, that during and shortly after
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TL7702-705-733B | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SUPPLY-VOLTAGE SUPERVISORS |
| TL7702A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Supply voltage Supervisor |
| TL7702A_03 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SUPPLY-VOLTAGE SUPERVISORS |
| TL7702A_10 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SUPPLY-VOLTAGE SUPERVISORS |
| TL7702ACD | 功能描述:監(jiān)控電路 2.53V Monitor 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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