Layout & Fabrication

Block diagram

I’ll start simple as I have no better idea : a BCD (Binary Coded Digital) to 7-segments converter, displaying hexadecimal. The chips are not in production anymore, only BCD decimal. I’ll try to copy the old TIL311 chip from TAOS and add a serial to parallel shift register so it will use less pins to address many chips. Here is the diagram from the TIL311 datasheet : And I’ll try to replace the 4-bit latch by a 4-bit shift register.

Explore a Standard Cell

Connect the dots

4 flip-flops (D-latch) for the shift register. May be 4 other flip-flops to memorize the values, like in a 74xx595. May be 4 MUX gates to select between serial input and parallel. Many logic gates for the decoder. And I don’t know yet what kind of circuit with large transistors for the output to LEDs.