Puzzle 32 of 100

An OR-AND-INVERT gate

Goal

Make Y low while A or B is high and C is also high.

Die: 13 by 15 squares
Layers: Metal, Polysilicon, Contact, N active, P active, N well
Inputs: A, B, C
Output: Y
Supply: VDD
Ground: GND

New in this puzzle

AND and OR swapped

Swapping AND and OR in the expression swaps the arrangements of the two strips. The node with two contacts moves from the P strip to the N strip.

Guide

Draw the N transistors: A and B side by side, in series with C.
Draw the P transistors: A and B in series, and C beside them.
Join the P and N outputs to Y.

Hint

In the N strip, A and B stand side by side, in series with C. In the P strip, A and B are in series and C is beside them. This time the node that needs two contacts is in the N strip.

Solution

This is the game's reference drawing for the puzzle. It meets the goal and passes the design rules. Other drawings can pass as well.

Top View of the solved die for puzzle 32, An OR-AND-INVERT gate, with the Side View below it. — Top View of the solved die, captured from the game. Paths that carry a high level at the moment shown are lit. The Side View below cuts through the row between the dashed lines.

The game window in Isometric View with the solved die for puzzle 32, An OR-AND-INVERT gate, the guide, and the scope. — The whole game window in Isometric View. The scope on the right compares each output with its target band, and the message above it confirms that the drawing passes.

Solution drawing for puzzle 32, An OR-AND-INVERT gate, drawn on a numbered grid with every layer in its game color and pattern. — The solution on the grid. Squares are numbered from the top left corner, so you can count them. The dashed outline marks the squares you draw, change, or erase; the rest is drawn when the puzzle opens.

Legend

Metal62 squares
Polysilicon39 squares
Contact13 squares
N active7 squares
P active14 squares
N well44 squares
Input padA, B, C
Output padY
Supply padVDD
Ground padGND
Squares you draw, change, or erase68 squares

About the drawing

The drawing uses 115 of the die's 195 squares.
Part of the drawing is in place when the puzzle opens. To finish it, paint 50 empty squares and change 18 drawn squares.
It forms 6 transistors: 3 N transistors and 3 P transistors. Each one is a place where polysilicon crosses active silicon.
13 contacts join metal to the polysilicon or active silicon under it.

Starting drawing for puzzle 32, An OR-AND-INVERT gate, on a numbered grid. — The drawing when the puzzle opens. The dashed outline marks the squares the solution changes.