Digital Circuits - Clocked Sequential Circuits

EE-290, Experiment 7, Spring '97


Introduction

The purpose of this experiment is to provide you with experience in working with clocked sequential circuits. Pay particular attention to the timing relationships between the circuit inputs, outputs and clocks. Fully test (and document the test results) your circuits. You may use the Digi-Designer pulsers manually and display lights or run your circuits at 1.0 KHz and use an oscilloscope to produce your timing diagrams.

Equipment Needed

1Digi-Designer with wires
174xx00 Quad 2-input NAND
174xx04 Hex Inverter
174xx10 Triple 3-input NAND
174xx74 Dual D positive edge triggered flip-flop
174xx76x Dual JK negative edge triggered flip-flop (Warning: the regular and LS76A versions of this chip have slightly different timing requirements)
174xx86 Quad 2-input XOR

Procedures

Part 1a:

Perform the Up-Down Counter with Enable part of Experiment 11-9 (Sequential Circuits) from page 458 in your text book.

Part 1b:

Perform the State Diagram part of Experiment 11-9 using a 74xx74 from page 458-9 in your text book.

Part 2 (optional):

Perform the Ripple Counter and Synchronous Counter parts of Experiment 11-10 (Counters) from page 459 in your text book.

Part 3 (optional):

Perform any additional parts of Experiments 11-9 or 11-10.