| Connect pin 1 of the 74LS00 (see the pinout diagram) to a switch on the Digital Lab.
|
| Also connect pin 2 to another switch.
|
|
|
| Integrated circuits require a power supply to operate, typically
|
| +5 Volts or +3.3 Volts. Typically, the power supply pins are indicated on the pinout
|
| with Vcc and GND (ground). Connect pin 14 of the 74LS00 to the available power supply (+5V)
|
| on the Digital Lab. Pin 7 should be connected to GND.
|
|
|
| 1 - Pin 3 should be connected to an LED (Light Emitting Diode) on the Digital Lab. Confirm,
|
| using the datasheet, that you can connect the LED to the output of the integrated circuit, i.e., record the values for IOH and IOL of the integrated circuit you are using. Why is one value positive and
|
| the other negative?
|
|
|
| 2 - Use the voltmeter to measure the state of pin 3 of the IC. Consider that a voltage greater than 1.5 V represents a logic signal “1” and that a voltage less than 1.5 V represents a logic signal “0”. Also measure the voltage on the remaining pins that you connected to the IC, to check its value when you put “0” or “1” on the inputs. Complete the table in figure E1.
|
|
|
| 3 - Are the results obtained in accordance with the truth table of a NAND gate?
|
|
|
| Now you will use a two-input NAND gate to implement a not inverter.
|
| Using pins 4, 5, and 6, implement the following circuit:
|
| The output (Pin 6) connects to an LED. The LED should turn on when it has a logic level of “1” and
|
| turn off when it has a logic level of “0”.
|