參數(shù)資料
型號(hào): TLC555Q
廠商: Texas Instruments, Inc.
英文描述: Socket Adapter for CY23FP12
中文描述: LinCMOS⑩定時(shí)器
文件頁數(shù): 9/13頁
文件大?。?/td> 190K
代理商: TLC555Q
www.ti.com
APPLICATION INFORMATION
0.1
μ
F
0.1
μ
F
C
T
C
L
R
L
Output
R
B
R
A
GND
TRIG
THRES
RESET
DISCH
CONT
V
DD
OUT
V
DD
2/3 V
DD
1/3 V
DD
GND
t
PHL
t
PLH
t
c(H)
t
c(L)
CIRCUIT
TRIGGER AND THRESHOLD VOLTAGE WAVEFORM
TLC555
6
1
3
8
5
4
7
2
tc(H)
tc(L)
Period
CT(RA
CTRBIn 2
tc(H)
RB) In 2 (In 2
0.693)
tc(L)
CT(RA
tc(L)
tc(H)
2RB) In 2
Output driver duty cycle
tc(L)
tc(H)
1 –
RB
RA
2RB
Output waveform duty cycle
tc(H)
tc(L)
RB
RA
2RB
TLC555-Q1
LinCMOS TIMER
SLFS078–OCTOBER 2006
Figure 3. Astable Operation
Connecting TRIG to THRES, as shown in
Figure 3
, causes the timer to run as a multivibrator. The capacitor C
T
charges through R
A
and R
B
to the threshold voltage level (approximately 0.67 V
DD
) and then discharges through
R
only to the value of the trigger voltage level (approximately 0.33 V
). The output is high during the charging
cycle (t
c(H)
) and low during the discharge cycle (t
c(L)
). The duty cycle is controlled by the values of R
A
, R
B
, and C
T
as shown in the following equations.
The 0.1-
μ
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 the TRIG and THRES inputs 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 (r
on
) during discharge adds to R
B
to provide another source of timing error in the calculation when R
B
is very low or r
on
is very high.
9
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