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參數(shù)資料
| 型號： | V62/04634-01 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封裝： | SO-14 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 433K |
| 代理商： | V62/04634-01 |
and triggers on the next negative-going zero crossing when
the arming threshold is has been exceeded.
MODE 3, PIN 5 GROUNDED
With pin 5 grounded, the input arming threshold is set to 0V,
±25mV maximum. Positive-going zero crossings arm the
chip, and the next negative-going zero crossing triggers it.
This is the very basic form of zero-crossing detection.
ONE SHOT TIMING
The one shot timing is set by a resistor and capacitor con-
nected to pin 14. The recommended maximum resistor value
is 150kohms. The capacitor value can be changed as needed,
as long as the capacitor type does not present any signfigant
leakage that would adversely affect the RC time constant.
The output pulse width is:
pulse width = 0.673 x R x C
(1)
For a given One Shot pulse width, the recommended maxi-
mum input signal frequency is:
Fin(max) = 1/(1.346 x R x C)
(2)
In the application example shown in figure 1 (R=150kohms,
C=0.001F) the recommended maximum input frequency will
typically be 5kHz. Operating with input frequencies above the
recommended Fin (max) value may result in unreliable per-
formance of the One Shot circuitry. For those applications
where the One Shot circuit is not required, device pin 14 can
be tied directly to Ground.
LOGIC INPUTS
In some systems it is necessary to externally generate pulses,
such as during stall conditions when the variable reluctance
sensor has no output. External pulse inputs at pin 9 are gated
through to pin 10 when Input Select (pin 11) is pulled high.
Pin 12 is a direct output for the one shot and is unaffected by
the status of pin 11.
Input/output pins 9, 11, 10, and 12 are all CMOS logic com-
patible. In addition, pins 9, 11, and 12 are TTL compatible.
Pin 10 is not guaranteed to drive a TTL load.
Pins 1, 4, 6 and 13 have no internal connections and can be
grounded.
www.national.com
10
200905 Version 2 Revision 1
Print Date/Time: 2010/07/23 13:58:32
LM1815EP
Enhanced
Plastic
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