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參數資料
| 型號： | LM8364 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Thin Film Resistor Network; Series:VSSR; Resistance:39ohm; Resistance Tolerance:+/- 2 %; Power Rating:1.4W; Voltage Rating:50V; Temperature Coefficient:+/-100 ppm; Package/Case:24-QSOP; Network Circuit Type:Isolated |
| 中文描述： | 微功耗欠壓傳感電路 |
| 文件頁數： | 5/8頁 |
| 文件大小： | 199K |
| 代理商： | LM8364 |
Application Notes
The propagation delay time for the LM8364 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
DET
,
and the built in hysteresis, V
HYS
.
The LM8364 ultra-low current voltage detector was designed
to monitor voltages and to provide an indication when the
monitored voltage, V
IN
, dropped below a precisely trimmed
threshold voltage. This characteristic is displayed in the typi-
cal operating timing diagram below. V
IN
is the voltage that is
being monitored and a pull up resistor is connected from the
RESET output pin to V
. V
is at some value above V
and then begins to decrease. Since this is an Active Low
device the RESET output is pulled High through the pull-up
resistor and tracks V
until V
crosses the trimmed thresh-
old V
. At this point the LM8364 recognizes that V
is
now in a fault condition and the output immediately changes
to the Logic Low State. The RESET output will remain in this
low state until V
IN
increases above the threshold V
DET
+
V
HYS
. This point is also known as V
DET+
as indicated earlier.
This built-in hysteresis has been added to the design to help
prevent erratic reset operation when the input voltage
crosses the threshold.
The LM8364 has a wide variety of applications that can take
advantage of its 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 for proper operation.
20065909
FIGURE 1. Propagation Delay Timing Diagrams
20065910
FIGURE 2. Timing Waveforms
L
www.national.com
5
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| LM8364BALMF20 | 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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