module Z74X138T 
title '74x138 Decoder with Three-State Output Enable
J. Wakerly, Stanford University' 
"Z74X138T device 'P16L8'; 

" Input pins 
A, B, C, !G2A, !G2B, G1, !OE  pin 1, 2, 3, 4, 5, 6, 7;

" Output pins
!Y0, !Y1, !Y2, !Y3            pin 19, 18, 17, 16 istype 'com'; 
!Y4, !Y5, !Y6, !Y7            pin 15, 14, 13, 12 istype 'com';

" Constant expression
ENB = G1 & G2A & G2B;
Y = [Y0..Y7];

equations
Y.OE = OE;
Y0 = ENB & !C & !B & !A; 
Y1 = ENB & !C & !B &  A; 
Y2 = ENB & !C &  B & !A; 
Y3 = ENB & !C &  B &  A; 
Y4 = ENB &  C & !B & !A; 
Y5 = ENB &  C & !B &  A; 
Y6 = ENB &  C &  B & !A; 
Y7 = ENB &  C &  B &  A;

end Z74X138T