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参数资料
| 型号： | TLC556MFK |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | DUAL LinCMOSE TIMERS |
| 中文描述： | 双LinCMOSE定时器 |
| 文件页数： | 10/18页 |
| 文件大小： | 261K |
| 代理商： | TLC556MFK |
TLC556, TLC556Y
DUAL LinCMOS
TIMERS
SLFS047B – FEBRUARY 1984 – REVISED SEPTEMBER 1997
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
0.1
μ
F
0.1
μ
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
tH
tL
CIRCUIT
TRIGGER AND THRESHOLD VOLTAGE WAVEFORM
TLC556
Figure 3. Astable Operation
Connecting the trigger input to the threshold input, 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
B
only to the value of the trigger voltage level (approximately 0.33 V
DD
).
The output is high during the charging cycle (t
H
) and low during the discharge cycle (t
L
). The duty cycle is
controlled by the values of R
A
, and R
B
, and C
T
, as shown in the equations below.
tH
tL
Period
tH
tL
tH
RA
CT(RA
CTRBIn 2
RB) In 2
(In 2
0.693)
tL
CT(RA
2RB) In 2
Output driver duty cycle
tL
1
RB
2RB
Output waveform duty cycle
tH
tH
tL
RB
RA
2RB
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 from the trigger and threshold inputs to the
discharge output. These delay times add directly to the period and create differences between calculated and
actual values that increase with frequency. In addition, the discharge output resistance r
on
adds to R
B
to provide
another source of error in the calculation when R
B
is very low or r
on
is very high.
The equations below provide better agreement with measured values.
tH
CT(RA
RB) In
3
exp
tPLH
CT(RB
ron)
tPHL
tL
CT(RB
ron) In
3
exp
tPHL
CT(RA
RB)
tPLH
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TLC556MFKB | 制造商:Texas Instruments 功能描述:Standard Timer Dual 20-Pin LCCC Tube |
| TLC556MJ | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:LOW POWER DUAL TIMER 制造商:Texas Instruments 功能描述:Standard Timer Dual 14-Pin CDIP Tube |
| TLC556MJB | 制造商:Texas Instruments 功能描述: |
| TLC556MN | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL LinCMOSE TIMERS |
| TLC556Y | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL LinCMOSE TIMERS |
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