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Circuit Description

This applet demonstrates the static two-input and three-input NOR gates in CMOS technology. Click the input switches or type the ('a','b') and ('c','d','e') bindkeys to control the gates.

The three-input NOR3 gate uses three p-channel transistors in series between VCC and gate-output, and the complementary circuit of a parallel-connection of three n-channel transistors between GND and gate-output.

  NOR3

  A  B  C  |  Y
-----------+----
  0  0  0  |  1
  0  0  1  |  0
  0  1  0  |  0
  0  1  1  |  0
  1  0  0  |  0
  1  0  1  |  0
  1  1  0  |  0
  1  1  1  |  0