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CA555 Datasheet(PDF) 4 Page - Harris Corporation

Part No. CA555
Description  Timers for Timing Delays and Oscillator Applications in Commercial, Industrial and Military Equipment
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Maker  HARRIS [Harris Corporation]
Homepage  http://www.harris.com
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CA555 Datasheet(HTML) 4 Page - Harris Corporation

   
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4
Figure 2 shows the typical waveforms generated during this
mode of operation, and Figure 3 gives the family of time
delay curves with variations in R1 and CT.
Repeat Cycle Timer (Astable Operation)
Figure 4 shows the CA555 connected as a repeat cycle
timer. In this mode of operation, the total period is a function
of both R1 and R2.
T = 0.693 (R1 + 2R2) CT = t1 + t2
where t1 = 0.693 (R1 + R2) CT
and t2 = 0.693 (R2) CT
the duty cycle is:
Typical waveforms generated during this mode of operation
are shown in Figure 5. Figure 6 gives the family of curves of
free running frequency with variations in the value of
(R1 +2R2) and CT.
tD
3V
3.3V
5V
0
0
0
SWITCH S1 “OPEN”
SWITCH S1 “CLOSED”
INPUT
VOLTAGE (TERMINAL 2)
CAPACITOR
VOLTAGE (TERMINALS 6, 7)
OUTPUT
VOLTAGE
(TERMINAL 3)
FIGURE 2. TYPICAL WAVEFORMS FOR RESET TIMER
TIME DELAY(s)
10
1
10-1
0.1
0.01
0.001
TA = 25
oC
R1 = 1kΩ
10k
1
10
100
V+ = 5V
100k
1M
10M
10-2
10-3
10-4
10-5
FIGURE 3. TIME DELAY vs RESISTANCE AND CAPACITANCE
1
CA555
EO
8
5
2
6
7
3
4
R1
CT
0.01
µF
RELAY
COIL
R2
V+
5V
FIGURE 4. REPEAT CYCLE TIMER (ASTABLE OPERATION)
t
1
t
1
t
2
+
----------------
=
R
1
R
2
+
R
1
2R
2
+
------------------------
CA555, CA555C, LM555C


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