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CA0555CE Datasheet(PDF) 4 Page - Harris Corporation

Part # CA0555CE
Description  Timers for Timing Delays and Oscillator Application in Commercial, Industrial and Military Equipment
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Manufacturer  HARRIS [Harris Corporation]
Direct Link  http://www.harris.com
Logo HARRIS - Harris Corporation

CA0555CE Datasheet(HTML) 4 Page - Harris Corporation

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8-6
Since the charge rate and threshold level of the comparator
are both directly proportional to V+, the timing interval is rel-
atively independent of supply voltage variations. Typically,
the timing varies only 0.05% for a 1V change in V+.
Applying a negative pulse simultaneously to the reset termi-
nal (4) and the trigger terminal (2) during the timing cycle
discharges CT and causes the timing cycle to restart.
Momentarily closing only the reset switch during the timing
interval discharges CT, but the timing cycle does not restart.
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.
1
CA555
EO
8
5
2
6
7
3
4
680
RESET
R1
CT
4.7K
680
10K
0.01
µF
RELAY
COIL
1N4001
V+
5V
S1
START
NOTE: All resistance values are in ohms.
FIGURE 1. RESET TIMER (MONOSTABLE OPERATION)
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, LM555, LM555C, NE555


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