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參數(shù)資料
| 型號(hào)： | TLC555QDRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬波形發(fā)生器 |
| 英文描述： | PULSE; RECTANGULAR, 1.2 MHz, TIMER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁(yè)數(shù)： | 2/14頁(yè) |
| 文件大?。?/td> | 209K |
| 代理商： | TLC555QDRQ1 |
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t
c(H) +
C
T
(R
A )
R
B
) In
3 –exp
–t
PLH
C
T
(R
B )
ron)
) tPHL
t
c(L) +
C
T
(R
B )
ron) In
3 –exp
–t
PHL
C
T
(R
A )
R
B
)
) tPLH
can be substituted with good results. Duty cycles less than 50%
t
c(H)
t
c(H) )
t
c(L) require that
t
c(H)
t
c(L) < 1 and
LinCMOS TIMER
SLFS078 – OCTOBER 2006
APPLICATION INFORMATION (continued)
The following equations provide better agreement with measured values.
These equations and those given previously are similar in that a time constant is multiplied by the logarithm of a
number or function. The limit values of the logarithmic terms must be between In 2 at low frequencies and In 3
at extremely high frequencies. For a duty cycle close to 50%, an appropriate constant for the logarithmic terms
possibly RA ≤ ron. These conditions can be difficult to obtain.
In monostable applications, the trip point on TRIG can be set by a voltage applied to CONT. An input voltage
between 10% and 80% of the supply voltage from a resistor divider with at least 500-
A bias provides good
results.
10
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