MINI LESSON 6 – EXAMPLE OF CONNECTING AN INTEGRATED CIRCUIT

CONNECTING AN INTEGRATED CIRCUIT

Below is an example of how to use an integrated circuit. The example shows how to connect a voltage regulator, how to place and power the IC, how to connect the inputs and outputs of the IC and how to use and LED to demonstrate the value of the output.

Problem

Create the following circuit. Use LEDs to show values of the inputs and outputs.

Solution

· In the TTL chip family, chip 7432 holds four OR gates.

· This will require us to use a 5 volt regulator. We start by connecting that.

· We then place the chip and power it (after consulting the pinout if needed).

· We decide which gate on the chip that we want to use. (The chip has four gates on it.)

· To show the value of the output Q, we will connect that output to an LED (and resistor). The other side is then connected to ground.

· We can now test the gate by adding wires from the inputs to either logical 1 or logical 0. The diagram shows one wire connected to 1 and one wire connected to 0.

· In the case above, the LED should be on because one of the two inputs is 1.

· Note that the two wires that are used to provide input to the gate are left long in this case to make it easier to switch back and forth from 0 to 1.