Make Electronics

Chips, Ahoy! 215

Experiment 23: Nice Dice

No connection

No connection

No connection

Negative

to enable

Negative

to enable

No connection

Clock

input A

Binary

output A

Binary

output B

Clock

input B

Binary

output C

Binary

output D

74LS92

Counter

1 2 3 4 5 6 7

14

13

12

11

10

9

8

Figure 4-101. The unusual pin assignments include four that have no connection of any
kind inside the chip, and can be left unattached.

4K7

4K7

4K7

1K 1K

100K

10uF

Low-

Current

LEDs

0.1uF

5V DC regulated power supply

1 8

555

74LS 92

Figure 4-102. This simple circuit uses a 555 timer running
slowly to control the 74LS92 binary counter and display the
succession of high states from its outputs.

Figure 4-103. The breadboard version of the schematic

in Figure 4-102 to display the outputs from a 74LS92

counter.