MC3021 is an IC that outputs a high if and only if the first two inputs are the same. As of alpha 3: any two inputs are accepted. If three are given, the last (input 3) is ignored. If only one is given, IC retains state.

Equivalent Perlstone script: AB^!r

Truth Table

A B Output
0 0 1
1 0 0
0 1 0
1 1 1

Sign Lines

  1. XNOR
  2. [MC3021]
  3. Blank
  4. Blank

IC Pins


  • The XNOR Operand


  • Outputs high if all or no inputs are high


Node Description Default Role Allows creation of the Xnor Gate (MC3021) IC. user