User's Manual
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Clock Radio
Sonic Alert msm80c154s
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INPUT/OUTPUT PORTS
209
V
CC
10k
Ω
I
B
V
CC
P
100k
Ω
OUT
CPU "1" OUT
Figure 5-13 Drive circuit for NPN transistor by level shifter
I
B
V
CC
OUT
CPU "0" OUT
Figure 5-14 PNP transistor direct connection drive circuit
1
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