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參數資料
| 型號： | TLC551CPE4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬波形發生器 |
| 英文描述： | PULSE; RECTANGULAR, 1.2 MHz, TIMER, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數： | 2/17頁 |
| 文件大小： | 299K |
| 代理商： | TLC551CPE4 |
TLC551, TLC551Y
LinCMOS
TIMERS
SLFS044B – FEBRUARY 1984 – REVISED SEPTEMBER 1997
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
0.1
F
0.1
F
CT
CL
RL
Output
RB
RA
GND
TRIG
THRES
RESET
DISCH
CONT
VDD
OUT
VDD
2/3 VDD
1/3 VDD
GND
tPHL
tPLH
tc(H)
tc(L)
CIRCUIT
TRIGGER AND THRESHOLD VOLTAGE WAVEFORM
TLC551
3
8
5
4
7
6
2
1
VDD
Figure 3. Astable Operation
Connecting TRIG to THRES, as shown in Figure 3, causes the timer to run as a multivibrator. The capacitor CT
charges through RA and RB to the threshold voltage level (approximately 0.67 VDD) and then discharges through RB
only to the value of the trigger voltage level (approximately 0.33 VDD). The output is high during the charging cycle
(tc(H)) and low during the discharge cycle (tc(L)). The duty cycle is controlled by the values of RA, and RB, and CT, as
shown in the equations below.
t
c(H) [
C
T
(R
A )
R
B
)In2 (In 2
+ 0.693)
t
c(L) [
C
T
R
B
In 2
Period
+ t
c(H) )
t
c(L) [
C
T
(R
A )
2R
B
)In2
Output driver duty cycle
+
t
c(L)
t
c(H) )
t
c(L)
[ 1–
R
B
R
A )
2R
B
Output waveform duty cycle
+
t
c(H)
t
c(H) )
t
c(L)
[
R
B
R
A )
2R
B
The 0.1-
F capacitor at CONT in Figure 3 decreases the period by about 10%.
The formulas shown above do not allow for any propagation delay times from TRIG and THRES to DISCH. These
delay times add directly to the period and create differences between calculated and actual values that increase with
frequency. In addition, the internal on-state resistance ron during discharge adds to RB to provide another source of
timing error in the calculation when RB is very low or ron is very high.
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