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參數(shù)資料
| 型號： | LM8365BCLMF30/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | SOT23-5 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 645K |
| 代理商： | LM8365BCLMF30/NOPB |
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
DET+ is equal to the sum of the detector threshold, VDET,
and the built in hysteresis, V
HYS.tD1 is the propagation time
from
High-to-Low
and
t
D2
is
the
propagation
from
Low-to-High.
The LM8365 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. 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 VDET+ (VDET +VHYS) the
capacitor connected to the C
D pin starts to charge up to VIN
through an internal pull-up resistor R
D. Once the capacitor
has charged up past the internal Delay Pin Threshold, which
is typically 0.675 V
IN, 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
LM8365
www.national.com
6
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