0x213 Digital Circuits

Combinatorial logic

Gates

Gate (NAND) \(\neg{(A \land B)}\)

Any gate can be implemented from NAND

TTL 7400 CMOS 4011

CMOS implementation

Adder

Adder (half adder) 2 input, 2 output. xor for sum, and for carry

Adder (full adder) 3 input, 2 output half adder + carry in

Multiplier

Sequential Logic

Latch

Latch (SR Latch) two nor gate (active high) two nand gate(active low)

Latch (Gated SR Latch) add a gate to SR Latch

Latch (Gated D Latch) S, R are merged into D bus

Oscillator

Reference