Digital Circuit Fundamentals 2 Unit 4 – Multiplexer and Demultiplexer
Exercise 1 – Data Selector and Multiplexer
EXERCISE OBJECTIVE
When you have completed this exercise, you will have a working knowledge of multiplexer
circuits by exercising a 1-of-8 multiplexer. You will gain this knowledge by exercising a 1-of-8
multiplexer.
DISCUSSION
- The 74LS151 data selector/multiplexer is a monolithic intergrated circuit with full on-chip
binary decoding which allows the IC to select the desired data source. - The multiplexer has 8 data input lines.
• Y and Y are complementary outputs.
• The multiplexer outputs are enabled only when STRB is low.
- Input data selection is controlled by the binary inputs applied to the data selects inputs
- The pull-up resistors ensure a proper high TTL level when two-post connectors are not
inserted into a specific circuit.