CA555 데이터 시트보기 (PDF) - Intersil
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CA555 Datasheet PDF : 6 Pages
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CA555, CA555C, LM555C
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.
3V SWITCH S1 “OPEN”
INPUT
VOLTAGE (TERMINAL 2)
0SWITCH S1 “CLOSED”
3.3V
CAPACITOR
VOLTAGE (TERMINALS 6, 7)
0
tD
5V
OUTPUT
VOLTAGE
(TERMINAL 3)
0
FIGURE 2. TYPICAL WAVEFORMS FOR RESET TIMER
100
TA = 25oC
V+ = 5V
10
1
R1 = 1kΩ
10kΩ
100kΩ
0.1
1MΩ
10MΩ
0.01
0.001
10-5
10-4
10-3
10-2
10-1
1
10
TIME DELAY(s)
FIGURE 3. TIME DELAY vs RESISTANCE AND CAPACITANCE
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.
R1
4
7
8
EO
R2
CA555
3
6
5
1
2
RELAY
COIL
V+
5V
CT
0.01µF
FIGURE 4. REPEAT CYCLE TIMER (ASTABLE OPERATION)
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:
-t-1----t-+-1----t--2- = -R-R---1--1---+-+---2--R--R---2-2--
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.
4
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