CA0555 datasheet(4/6 Pages) HARRIS | Timers for Timing Delays and Oscillator Application in Commercial, Industrial and Military Equipment

4 page

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.

CA555

680

RESET

4.7K

680

10K

0.01

µF

RELAY

COIL

1N4001

V+

START

NOTE: All resistance values are in ohms.

FIGURE 1. RESET TIMER (MONOSTABLE OPERATION)

3.3V

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

0.1

0.01

0.001

TA = 25

R1 = 1kΩ

10k

Ω

100

V+ = 5V

100k

Ω

10M

Ω

10-2

10-3

10-4

10-5

FIGURE 3. TIME DELAY vs RESISTANCE AND CAPACITANCE

CA555

0.01

µF

RELAY

COIL

V+

FIGURE 4. REPEAT CYCLE TIMER (ASTABLE OPERATION)

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CA555, CA555C, LM555, LM555C, NE555

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