EE-290 Experiment 6 -- Digital Circuits - Introduction to Sequential Circuits

Digital Circuits - Introduction to Sequential Circuits

EE-290, Experiment 6, Spring '97

Introduction

In this lab you will verify the truth table for three flip-flop circuits. Flip-flops are digital circuits that have two stable states. See pages 202-218 (Sections 6-1 through 6-3) and 455-458 (Section 11-8) in your text book.

Equipment Needed

1	7400 Quad NAND
1	7476 Dual JK flip-flop
1	7474 Dual D flip-flop (edge triggered)
1	7475 4-bit latch
1	Digi-Designer with wires
1	Logic probe (optional, for debugging)

Procedures

Verify the truth table in Figure 6-3 for R'-S' flip-flop constructed using NAND gates. Note this is a "not R - not S flip-flop."

Verify the function tables in Figures 6-15 and 11-12 for the J-K flip-flops in the 7476.

Verify the characteristic table in Figures 6-5 (this figure is printed incorrectly in some editions of the book) and 11-13 for the D like flip-flops in the 7474 and the 7475. Explain the difference between the 7474 and the 7475 (and no the answer is not 1).