Chapter 16
Appendix
Cautions for Circuit Setup XVI - 3
■ Unused Pin (Only for Input)
Insert some 10 kΩ resistor to unused pins (only for input) to pull up or down.
If the input is unstable, Pch transistor and Nch transistor of input inverter are on, and through current goes to the
input circuit. That increases current consumption and causes power supply noise.
Figure:16.1.2 Unused Pins (Only for Input)
Figure:16.1.3 Input Inverter Organization and Characteristics
some10 kΩ
Input
Input pin
Input
Input pin
some 10 kΩ
Input
Pch
Input pin
Nch
5
0 Input Voltage
(V
DD
=5 V)
Current
Through Current
Input Inverter Characteristics
Input Inverter Organization
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