experiment 6: flip-flops and feedback devices - The Circuits and ...

PROCEDURE
Before performing the procedures listed below, read the report section of the experiment to
assure you make all required measurements and record all required data.
A. Gated RS NOR Latch
1. Connect the R, S, and gate inputs of the gated RS NOR latch, which you constructed
in the prelab, to the toggle switches on the logic box. Observe the outputs on two of the
logicbox LED's for the following input sequence:
2. With the gate input LOW, observe the outputs on the oscilloscope for the following
input sequence obtained by using a single toggle switch to supply the same signal to both R and
S:
Does the latch always have the same output values after S and R return LOW. If so, would the
outputs be the same if the S and R inputs were interchanged and the Q and Q' outputs were
interchanged, i.e., if the positions of the gates were interchanged in the circuit. Name two
reasons why the input combination R = 1, S=1 is usually not used on the latch?
6.10