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參數資料
| 型號： | LM8365BALMFX22 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Micropower Undervoltage Sensing Circuits with Programmable Output Delay |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | SOT23-5 |
| 文件頁數： | 6/9頁 |
| 文件大小： | 264K |
| 代理商： | LM8365BALMFX22 |
Application Notes
The propagation delay time for the LM8365 is measured
using a 470k
pull-up resistor connected to from the RESET
output pin to 5V in addition to a 10pF capacitive load con-
nected from the same pin to GND.
Figure 1
shows the timing
diagram for the measurement for the propagation delay.
V
is equal to the sum of the detector threshold, V
,
and the built in hysteresis, V
HYS
. t
D1
is the propagation time
from
High-to-Low
and
t
D2
Low-to-High.
is
the
propagation
from
The LM8365 ultra-low current voltage detector was designed
to monitor voltages and to provide an indication when the
monitored voltage, V
, dropped below a precisely trimmed
threshold voltage. The voltage detector of the LM8365 drives
a time delay generator that may be programmed for fixed
lengths of time depending on the application needs. This
characteristic is displayed in the typical operating timing
diagram in
Figure 2
. V
IN
is the voltage that is being moni-
tored and as it decreases passed the precisely trimmed
threshold V
DET
the Active Low RESET output drops to a
Logic Low state and the C
D
pin drops to 0V. During this state
the external capacitor connected to the C
D
pin is immedi-
ately discharged by an internal N-Channel MOSFET. When
V
IN
increases above the threshold V
DET+
(V
DET
+ V
HYS
) the
capacitor connected to the C
D
pin starts to charge up to V
IN
through an internal pull-up resistor R
. Once the capacitor
has charged up past the internal Delay Pin Threshold, which
is typically 0.675 V
, the RESET output will revert back to
it’s original state. The LM8365 has built-in hysteresis to help
prevent erratic reset operation when the input voltage
crosses the threshold.
The LM8365 has a wide variety of applications that can take
advantage of it’s precision and low current consumption to
monitor Input voltages even though it was designed as a
reset controller in portable microprocessor based systems. It
is a very cost effective and space saving device that will
protect your more expensive investments of microproces-
sors and other devices that need a guaranteed supply volt-
age and time delay for proper operation.
20066016
FIGURE 1. Propagation Delay Timing Diagrams
L
www.national.com
6
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM8365BALMFX22/NOPB | 制造商:Texas Instruments 功能描述:Processor Supervisor 2.2V 1V to 6V 5-Pin SOT-23 T/R |
| LM8365BALMFX27 | 功能描述:監控電路 RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| LM8365BALMFX27/NOPB | 功能描述:監控電路 RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| LM8365BALMFX45 | 功能描述:監控電路 RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| LM8365BALMFX45/NOPB | 功能描述:監控電路 RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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