MC1455DR2G ON Semiconductor, MC1455DR2G Datasheet - Page 6

• Manufacturer Part Number: MC1455DR2G
• Description: IC OSC MONO TIMING 8-SOIC
• Manufacturer: ON Semiconductor
• Type: 555 Type, Timer/Oscillator (Single)r

Specifications of MC1455DR2G

• Current - Supply: 10mA
• Mounting Type: Surface Mount
• Voltage - Supply: 4.5 V ~ 16 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Count: -
• Frequency: -
• Lead Free Status / Rohs Status: Compliant
• Other names: MC1455DR2G; MC1455DR2GOSTR

Astable Mode
retrigger itself and cause the capacitor voltage to oscillate
between 1/3 V
R
ratio of these resistors the duty cycle can be varied. The
charge and discharge times are independent of the supply
voltage.
The charge time (output high) is given by:
The discharge time (output low) is given by:
Thus the total period is given by:
and may be easily found as shown in Figure 19.
The duty cycle is given by:
The frequency of oscillation is then:
B
In the astable mode the timer is connected so that it will
The external capacitor changes to 2/3 V
and discharges to 1/3 V
R
R
(R
L
L
A
Figure 15. Monostable Waveforms
= 10 kW, C = 0.01 mF, R
Trigger
Figure 17. Astable Circuit
Output
CC
3
2
T + t 1 ) t 2 + 0.695 (R A ) 2R B ) C
+V
t 1 + 0.695 (R A ) R B ) C
t 2 + 0.695 (R B ) C
and 2/3 V
Reset
CC
t = 50 ms/cm
(5.0 V to 15 V)
4
MC1455
1
CC
CC
L
= 1.0 kW, V
. See Figure 17.
through R
V
8
DC +
CC
f +
Voltage
Control
5
CC
7 Discharge
6 Threshold
1
1
+
R A ) 2R B
= 15 V)
CC
B
. By varying the
(R A ) 2R B )C
through R
R B
1.44
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A
R
R
B
A
C
and
6
To obtain the maximum duty cycle R
possible; but it must also be large enough to limit the
discharge current (Pin 7 current) within the maximum rating
of the discharge transistor (200 mA).
0.001
The minimum value of R
0.01
0.001
100
1.0
0.1
0.01
10
100
1.0
0.1
10
10 ms
0.1
(R
A
= 5.1 kW, C = 0.01 mF, R
100 ms 1.0 ms
(R
A
Figure 18. Astable Waveforms
Figure 19. Free Running Frequency
R A w
+ 2 R
1.0
Figure 16. Time Delay
B
f, FREE RUNNING FREQUENCY (Hz)
)
V CC (Vdc)
I7 (A)
10
t
d
, TIME DELAY (s)
10 ms
t = 20 ms/cm
A
L
is given by:
= 1.0 kW; R
w
100
100 ms
V CC (Vdc)
A
0.2
B
1.0 k
must be as small as
= 3.9 kW, V
1.0
10 k
CC
10
= 15 V)
100
100