MC1455 ON Semiconductor, MC1455 Datasheet - Page 8

• Manufacturer Part Number: MC1455
• Description: Timing Circuit
• Manufacturer: ON Semiconductor

Pulse Width Modulation
monostable mode of operation, the charge time of the
capacitor can be varied by changing the control voltage at
Pin 5. In this manner, the output pulse width can be
modulated by applying a modulating signal that controls the
threshold voltage.
*NCV prefix is for automotive and other applications requiring site and control changes.
DEVICE ORDERING INFORMATION
MC1455P1
MC1455D
MC1455BD
MC1455BP1
NCV1455BDR2*
If the timer is triggered with a continuous pulse train in the
Output
Clock
Input
9.1 k
1.0 mF
Device
6
7
Figure 24. Pulse Width Modulator
R
2
L
MC1455
8
3
2
+V
CC
1
(5.0 V to 15 V)
4
4
MC1455
1
5
3
0.01 mF
Load
8
0.001 mF
27 k
5.0 mF
Operating Temperature Range
7
6
5
MC1455, MC1455B, NCV1455B
T
T
T
A
9.1 k
T
T
A
A
A
A
= −40 C to +125 C
= −40 C to +85 C
= −40 C to +85 C
6
7
2
Modulation
Input
= 0 C to +70 C
= 0 C to +70 C
Figure 26. Sequential Timer
R
A
http://onsemi.com
8
MC1455
C
1
8
4
Test Sequences
sequential timing. An example is shown in Figure 26 where
the sequence is started by triggering the first timer which
runs for 10 ms. The output then switches low momentarily
and starts the second timer which runs for 50 ms and so forth.
5
3
Several timers can be connected to drive each other for
Load
0.01 mF
Figure 25. Pulse Width Modulation Waveforms
0.001 mF
27 k
5.0 mF
(R
18.2 k
A
= 10 kW, C = 0.02 mF, V
6
7
2
Plastic Dip
Plastic Dip
Package
SO−8
SO−8
SO−8
8
MC1455
t = 0.5 ms/cm
1
4
CC
= 15 V)
5
3
V
CC
2500/Tape & Rail
Load
0.01 mF
50 Units/Rail
98 Units/Rail
50 Units/Rail
98 Units/Rail
(5.0 V to 15 V)
Shipping