TTL-series 74182 CLA generator circuit

Description

This applet shows the internal structure of the 74182 4-bit Carry-Lookahead Generator.

Click the input switches or type the following bindkeys: 'c' for CN/ (active-low carry in), and '1'..'4' for 'X0'..'X3', and '5'..'8' for 'Y0'..'Y3'.

The output signals are calculated in two-level logic as:

  X = X3 + X2 + X1 + X0
  Y = Y3 (X3 + Y2) (X3 + X2 + Y1) (X3 + X2 + X1 + Y0)

  /Cn+x = /(Y0 (X0 + Cn))
  /Cn+y = /(Y1 (X1 + Y0 (X0 + Cn)))
  /Cn+z = /(Y2 (X2 + Y1 (X1 + Y0 (X0 + Cn))))

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