- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358839 > LM322N (NATIONAL SEMICONDUCTOR CORP) Precision Timers PDF資料下載
參數(shù)資料
| 型號(hào)： | LM322N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬波形發(fā)生器 |
| 英文描述： | Precision Timers |
| 中文描述： | RECTANGULAR, TIMER, PDIP14 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-14 |
| 文件頁(yè)數(shù)： | 12/14頁(yè) |
| 文件大?。?/td> | 281K |
| 代理商： | LM322N |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)當(dāng)前第12頁(yè)第13頁(yè)第14頁(yè)
Application Hints
(Continued)
Triggering with Negative Edge
Although the LM122 is triggered by a positive going trigger
signal, a differentiator tied to a normally ‘‘high’’ trigger will
result in negative edge triggering. In Figure 19, R1 serves
the dual purpose of holding the trigger pin normally high and
differentiating the input trigger pulse coupled through C1.
The timing diagram included with Figure 21 shows that trig-
gering actually occurs a short time after the negative going
trigger, while positive going triggers have no effect. The de-
lay time between a negative trigger signal and actual starts
of timing is approximately (0.5 to 1.5) (R1
#
C1) depending
on the trigger amplitude, or about 2.5 to 7.5
m
s with the
values shown. This time will have to be increased for C
t
larger than 0.01
m
F because C
t
is charged to V
REF
whenev-
er the trigger pin is kept high and must reset itself during the
short time that the trigger pin voltage is low. A conservative
value for C1 is:
C1
t
C
t
10
Chain of Timers
The LM122 can be connected as a chain of timers quite
easily with no interface required. InFigure 20A and20B, two
TL/H/7768–30
FIGURE 19. Timer Triggered by Negative
Edge of Input Pulse
possible connections are shown. In both cases, the output
of the timer is low during the timing period so that the posi-
tive going signal at the end of the timing period can trigger
the next timer. There is no limitation on the timing period of
one timer with respect to any other timer before or after it,
because the trigger input to any timer can be high or low
when that timer ends its timing period.
TL/H/7768–31
(a)
TL/H/7768–32
TL/H/7768–33
(b)
FIGURE 20. Chain of Timers
12
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM122H-MIL | Analog Timer Circuit |
| LM322 | Precision Timers |
| LM323A | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| LM323H | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| LM323KSTEEL | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM322N/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Timer Circuit |
| LM323 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Three-terminal 3 A adjustable voltage regulators |
| LM323/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Voltage Regulators |
| LM323_02 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.0 A Positive Voltage Regulators |
| LM323_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Three-terminal 3 A adjustable voltage regulators |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。