INPUT/OUTPUT PORTS

VCC

VCC

10kΩ 100kΩ

OUT

P

IB

CPU "1" OUT

Figure 5-13 Drive circuit for NPN transistor by level shifter

VCC

CPU "0" OUT

OUT

IB

Figure 5-14 PNP transistor direct connection drive circuit

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Image 216
Sonic Alert msm83c154s, msm80154s, msm85c154hvs user manual 209, CPU 0 OUT