ALU Design (bits 0 - 3) #1 PCB

The ALU (bits 0..3) board lay out in EagleCAD. The EagleCAD board file can be downloaded here and the schematic here.

The following settings were used whilst laying out the board everything else was left as default

• DRC set to Eurocircuits-EAGLE design rules setup for 2-layer PatternClass6 BaseCopper018 eCDefault. The DRC rules can be downloaded from Eurocircuits website. 
• The version text used size = 0.05, ratio 8 %, line distance 50%, and font set to vector
• The labelling of the input & outputs header pins used text  size = 0.04, ratio 8%, line distance 50%, and font set to vector
• Silkscreen text placed on layer 21 tPlace.
• DRC clearance changed to 0.2mm (8mil) for wire: wire, pad and via
• DRC minimum width changed to 0.25mm (10mil) for signal and 0.30 (12mil) for power
• Restring changed to 0.25mm (10mil) for pads: top and bottom. 
• Restring changed to 0.25mm (10mil) for vias outer

 A net class was defined for power with a width of 0.3mm, drill 0mil and clearance 0.mm. The default net class was set to 0.25mm width, 0mil drill and 0.22mm clearance.

Partlist

The parts list exported from EagleCAD. 

Part     Value          Package      Library  Position (inch)       Orientation

C1       0.1uF          C050-030X075 rcl      (0.55 0.6)            R0
C2       0.1uF          C050-030X075 rcl      (0.95 0.6)            R180
C4       0.1uF          C050-030X075 rcl      (2.15 0.6)            R180
C5       0.1uF          C050-030X075 rcl      (0.9 2.95)            R90
C6       0.1uF          C050-030X075 rcl      (1.5 2.95)            R90
C7       0.1uF          C050-030X075 rcl      (2.1 2.95)            R90
C8       0.1uF          C050-030X075 rcl      (3.55 1)              R270
C9       0.1uF          C050-030X075 rcl      (3.55 2.15)           R270
C10      10uF           E5-5         rcl      (0.9 0.3)             R90
C11      0.1uF          C050-030X075 rcl      (2.7 2.9)             R90
C12      10uF           E5-5         rcl      (3.2 2.7)             R270
CONTROL                 1X08         pinhead  (1.85 0.3)            R180
IC1      74HC08N        DIL14        74xx-eu  (1.2 2.5)             R270
IC2      74HC32N        DIL14        74xx-eu  (1.8 2.5)             R270
IC3      74HC86N        DIL14        74xx-eu  (2.4 2.5)             R270
IC4      74HC157N       DIL16        74xx-eu  (1.2 1.15)            R90
IC5      74HC153N       DIL16        74xx-eu  (3.2 1.9)             R270
IC6      74HC153N       DIL16        74xx-eu  (3.2 0.75)            R270
IC7      7483N          DIL16        74xx-eu  (1.8 1.15)            R90
IC8      74HC157N       DIL16        74xx-eu  (0.55 2.5)            R270
IC9      74HC153N       DIL16        74xx-eu  (2.4 1.15)            R90
IC10     74HC86N        DIL14        74xx-eu  (0.6 1.2)             R90
INPUT                   1X08         pinhead  (0.2 1.4)             R90
JP4                     1X02         pinhead  (0.6 0.2)             R180
JP5                     1X02         pinhead  (3.45 2.8)            R0
OUTPUT                  1X08         pinhead  (3.75 1.45)           R270

The mount holes used library component: MOUNT-HOLE3.0 (MOUNT-HOLE).