Elenco Understanding Logic Gates and Circuits Manuel d'utilisateur télécharger pdf (Page 18)

U19

U16

Project 11: Gated S-R Latch

The Enable input (E) can be used as a clock input, or a read/write strobe.

U19

U16

This circuit demonstrates how a Gated S-R Latch

works. Turn the slide switch (S1) on. Connect one

the loose end of the orange wire to 1 (Latch

enabled). Repeat the experiments from Project 9

to verify that this now functions as an S-R NOR

Latch. Now with S=1 and R=0 (red LED should be

on), disconnect the orange wire from 1 and

connect it to 0 (Latch disabled). The red LED

should now remain on no matter whether you

connect the red and black wires to 1 or 0. Now

with S=0 and R= 1, move the orange wire back to 1

(Latch enabled so red LED should go off). Now

move the orange wire back to 0 again (Latch

disabled). The red LED should now remain off no

matter whether you connect the red and black

wires to 1 or 0. The green LED should always be the

opposite of the red LED (green LED off when red

LED on and green LED on when red LED off) since

the green LED represents Q which is the opposite

of Q.

Input (E) Q, Q

0 Hold State

1 Same as S-R Latch

 Operates as S-R

Latch when E=1

 Holds output

state when E=0

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Elenco Understanding Logic Gates and Circuits Manuel d'utilisateur Page 18