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Design Your Own IC, Part 1

Prototyping with CPLDs

Design Your Own IC, Part 1
Designing a circuit always involves several somewhat disagreeable tasks, such as soldering, looking up the pinouts of ICs and laying out a maze of tracks on a printed circuit board. All of this is now no longer necessary, since you can program your own digital circuit in a CPLD.The CPLD experimenter’s board presented here makes an excellent starting point for sitting down at the keyboard and directly designing your own circuit.For most people, experimenting with digital logic brings to mind an image of an experimenter’s board stuffed full of ICs interconnected by countless wires. Anyone who has ever worked in this manner knows that such an arrangement usually takes many hours to construct, not to mention the modifications that have to be made if the circuit does not work properly right off the bat.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1,R10,R20,R23,R26 = 10kOhm
R2-R9,R25 = 1kOhm
R11-R18 = 680Ohm
R19,R24 = 10kOhm 8-way SIL array
R21 = 100kOhm
R22 = 100Ohm
C1,C12 = 10µ F 16V radial
C2 = 100µ F 16V radial
C3-C6,C8-C11,C15-C20 = 100nF
C7 = 22µ F 16V radial
C13,C14 = 22pF
D1-D8,D10 = LED, red, low current
D9 = 1N4001
LD1 = 7-segment-display, common anode, e.g., HD1131 O)
IC1 = EPM7128SLC84-10 or EPM7128SLC84-15
IC2 = 7805
IC3,IC4,IC9 = 74HCT563
IC5-IC8 = 74HCT74
JP1,JP2 = 2-way header with jumper
K1 = 2-way PCB terminal block, lead pitch 5mm
K2 = 10-way boxheader
K3-K6 = 20-way boxheader
S1-S8 = slide switch, 1 changeover contacts, e.g., APEM A2
X1 = 4.000MHz quartz crystal
84-way PLCC socket
PCB, order code 030385-1
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