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2. Sourcing a LED. The diagram to the right shows a NAND gate being used to source a LED to an externjal ground. Construct the circuit on your trainer and use the input switches to test the output through the gate's truth table. Complete the table below with your results. +5V Input A Input B Output Is LED ON or OFF 1 1 1 1 3. Sinking a LED. The diagram to the right shows a NAND gate being used to sink a LED to an external +5V source. Construct the circuit on your trainer and use the input switches to test the output through the gate's truth table. Complete the table below with your results. +5V +5V Input A Input B Output Is LED ON or OFF 1 1 1 1

2. Sourcing a LED. The diagram to the right shows a NAND gate being used to source a LED to an externjal ground. Construct the circuit on your trainer and use the input switches to test the output through the gate's truth table. Complete the table below with your results. +5V Input A Input B Output Is LED ON or OFF 1 1 1 1 3. Sinking a LED. The diagram to the right shows a NAND gate being used to sink a LED to an external +5V source. Construct the circuit on your trainer and use the input switches to test the output through the gate's truth table. Complete the table below with your results. +5V +5V Input A Input B Output Is LED ON or OFF 1 1 1 1

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Solve 2 and 3 please.
Objective B: Sinking and sourcing with NAND gates. There are two ways that an output device can be activated by a logic gate. This is because every logic gate must be connected to its own independent +V source and -V common, or ground. We can complete a current path to an external device using either of these. 1. The gate can either provide the positive polarity to a device which is externally connected to a negative ground. This is called "sourcing" as the gate is assumed to be the source of the current flow (remember that all digital electronics assumes a conventional current flow of positive to negative). When you source a device the device is activated by a HIGH output from the gate. The gate can also provide a negative polarity to an external positive polarity. This is called "sinking" as the gate is being used to ground the circuit. When you sink a device the device is activated by a LOW output from the gate. If the output device to be activated is a polarized semiconductor then care must be used to be sure that the device is properly aligned for the desired method. That is that the device will be forward biased by the intended current path. The purpose of the series resistor is to act as a current limiter for the diode. 2. Sourcing a LED. The diagram to the right shows a NAND gate being used to source a LED to an external ground. Construct the circuit on your trainer and use the input switches to test the output through the gate's truth table. Complete the table below with your results. +5V Input A Input B Output Is LED ON or OFF 1 1 1 1 Sinking a LED. The diagram to the right shows a NAND gate being used to sink a LED to an external +5V source. Construct the circuit on your trainer and use the input switches to test the output through the gate's truth table. Complete the table below with your results. 3. +5V +5V Input A Input B Output Is LED ON or OFF 1 1 1 1
Transcribed Image Text:Objective B: Sinking and sourcing with NAND gates. There are two ways that an output device can be activated by a logic gate. This is because every logic gate must be connected to its own independent +V source and -V common, or ground. We can complete a current path to an external device using either of these. 1. The gate can either provide the positive polarity to a device which is externally connected to a negative ground. This is called "sourcing" as the gate is assumed to be the source of the current flow (remember that all digital electronics assumes a conventional current flow of positive to negative). When you source a device the device is activated by a HIGH output from the gate. The gate can also provide a negative polarity to an external positive polarity. This is called "sinking" as the gate is being used to ground the circuit. When you sink a device the device is activated by a LOW output from the gate. If the output device to be activated is a polarized semiconductor then care must be used to be sure that the device is properly aligned for the desired method. That is that the device will be forward biased by the intended current path. The purpose of the series resistor is to act as a current limiter for the diode. 2. Sourcing a LED. The diagram to the right shows a NAND gate being used to source a LED to an external ground. Construct the circuit on your trainer and use the input switches to test the output through the gate's truth table. Complete the table below with your results. +5V Input A Input B Output Is LED ON or OFF 1 1 1 1 Sinking a LED. The diagram to the right shows a NAND gate being used to sink a LED to an external +5V source. Construct the circuit on your trainer and use the input switches to test the output through the gate's truth table. Complete the table below with your results. 3. +5V +5V Input A Input B Output Is LED ON or OFF 1 1 1 1
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