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LATCHES

LATCHES. Flip-flops and latches. Flip-flops and latches are the fundamental elements of sequential circuits Flip-flops and latches are used to store 1 bit of information Flip-flops and latches (normally) have 2 complementary outputs Usually denoted as Q and. Latch.

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LATCHES

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  1. LATCHES

  2. Flip-flops and latches • Flip-flops and latches are the fundamental elements of sequential circuits • Flip-flops and latches are used to store 1 bit of information • Flip-flops and latches (normally) have 2 complementary outputs • Usually denoted as Q and

  3. Latch • Latch are the bi-stable devices which responds to the change of input logic levels as they occur. Q Complementory output Inputs Latch Q is the primary output is its complemetory

  4. S-R Latch using NOR gate The two inputs, S and R denote ``set'' and ``reset'' respectively.

  5. Truth Table of S-R Latch

  6. R Q Q’ S-R Latch using NAND gate S

  7. Truth Table of S-R Latch

  8. Level-Sensitive/ Gated SR-Latch • “Q” only changes when CLK is high (i.e. level-sensitive) • When CLK is high, behavior same as SR latch E S R Q 0 X X No change 1 0 0 No change 1 0 1 0 1 1 0 1 1 1 1 Undefined

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