1. The George Washington University School of Engineering and Applied Science Department of Electrical and Computer Engineering ECE122 – Lab 7 Binary Counter Ritu Bajpai August 18, 2009

2. Introduction Sequential circuit that goes through a prescribed sequence of states We’ll design binary up-down counter Use T flip flops T flip flop designed by tying the inputs of JK flip flop together

3. Characteristic Table QJKQ(t+1) 0000 0010 0101 0111 1001 1010 1101 1110 QT 000 011 101 110 JK flip-flop T flip-flop

4. JK flip flop NAND LATCH

5. JK flip flop output response

6. 4-bit up down binary counter

7. Counter output response