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NE555 Datasheet(PDF) 11 Page - Texas Instruments

Part No. NE555
Description  xx555 Precision Timers
Download  36 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

NE555 Datasheet(HTML) 11 Page - Texas Instruments

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background image
L
B
H
A
B
t
R
Low-to-high ratio
t
R
R
=
=
+
H
B
H
L
A
B
t
R
Output waveform duty cycle
1
t
t
R
2R
=
= -
+
+
L
B
H
L
A
B
t
R
Output driver duty cycle
t
t
R
2R
=
=
+
+
(
)
A
B
1.44
frequency
R
2R
C
»
+
(
)
H
L
A
B
period
t
t
0.693 R
2R
C
=
+
=
+
( )
L
B
t
0.693 R
C
=
(
)
H
A
B
t
0.693 R
R
C
=
+
GND
OUT
VCC
CONT
RESET
DISCH
THRES
TRIG
C
RB
RA
Output
RL
0.01
µF
VCC
(5 V to 15 V)
(see Note A)
NOTE A: Decoupling CONT voltage to ground with a capacitor can
improve operation. This should be evaluated for individual
applications.
Open
5
8
4
7
6
2
3
1
Pin numbers shown are for the D, JG, P, PS, and PW packages.
Time − 0.5 ms/div
t
H
Capacitor Voltage
Output Voltage
tL
RA = 5 kW
RL = 1 kW
RB = 3 kW
See Figure 12
C = 0.15
µF
NA555, NE555, SA555, SE555
www.ti.com
SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014
Feature Description (continued)
8.3.2 A-stable Operation
As shown in Figure 12, adding a second resistor, RB, to the circuit of Figure 9 and connecting the trigger input to
the threshold input causes the timer to self-trigger and run as a multi-vibrator. The capacitor C charges through
RA and RB and then discharges through RB only. Therefore, the duty cycle is controlled by the values of RA and
RB.
This astable connection results in capacitor C charging and discharging between the threshold-voltage level (
0.67 × VCC) and the trigger-voltage level (≈ 0.33 × VCC). As in the mono-stable circuit, charge and discharge
times (and, therefore, the frequency and duty cycle) are independent of the supply voltage.
Figure 12. Circuit for Astable Operation
Figure 13. Typical Astable Waveforms
Figure 12 shows typical waveforms generated during astable operation. The output high-level duration tH and
low-level duration tL can be calculated as follows:
(1)
(2)
Other useful relationships are shown below:
(3)
(4)
(5)
(6)
(7)
Copyright © 1973–2014, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Links: NA555 NE555 SA555 SE555


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