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TLC556IDRG4 Datasheet(PDF) 10 Page - Texas Instruments

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Part No. TLC556IDRG4
Description  DUAL LinCMOSE TIMERS
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TLC556IDRG4 Datasheet(HTML) 10 Page - Texas Instruments

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TLC556, TLC556Y
DUAL LinCMOS
™ TIMERS
SLFS047B – FEBRUARY 1984 – REVISED SEPTEMBER 1997
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
0.1
µF
0.1
µF
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 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 (tH) and low during the discharge cycle (tL). The duty cycle is
controlled by the values of RA, and RB, and CT, as shown in the equations below.
tH [ CT (RA ) RB) In 2 (In 2 + 0.693)
tL [ CT RB In 2
Period
+ t
H ) tL [ CT (RA ) 2RB)In 2
Output driver duty cycle
+
tL
tH ) tL
[ 1 *
RB
R
A )
2RB
Output waveform duty cycle
+
tH
tH ) tL
[
RB
R
A )
2RB
The 0.1-
µF 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 ron adds to RB to provide
another source of error in the calculation when RB is very low or ron is very high.
The equations below provide better agreement with measured values.
tH + CT (RA ) RB)In
3
* exp
* t
PLH
CT (RB ) ron)
) t
PHL
tL + CT (RB ) ron)In
3
* exp
* t
PHL
CT (RA ) RB)
) t
PLH


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