1. Download the datasheet from www.ti.com for the 74LS151. The fastest possible device type needs to be used. Which device type has the fastest average performance?
a. SN74150
b. SN74151A
c. SN74LS151
d. SN74S151
2. View a datasheet function table for a 74151 device. Using Quartus pin names, assume the chip is enabled and C = 1, B = 0, and A = 0. Which data input appears on output Y? (Points : 1)
a. D0
b.D1
c.D4
d. None of the above
3. View a datasheet function table for a 74151 device. Which are the select input pin names, and which is the active level of the select input pins?
a. D0, D1, D2, D3, D4, D5, D6, and D7, which are all active low
b. D0, D1, D2, D3, D4, D5, D6, and D7, which are all active high
c. C, B, and A, which are all active low
d. C, B, and A, which are all active high
4. View a datasheet function table for a 74151 device. Data are applied to D4, the device is enabled, and the select lines are set to select D4. Which output will have an inverted version of D4?
a. DO
b. GN
c. WN
d. Y
5. View a datasheet function table for a 74151 device. The inputs to the 74151 are C = 0, B = 1, A = 1, D7 = 0, D6 = 0, D5 = 1, D4 = 1, D3 = 1, D2 = 1, D1 = 0, D0 = 1, and GN = 0. Which is the value of Y and why?
a. Y = 1, because the device is not enabled.
b. Y = 1, because the select lines indicate that D3 should be selected.
c. Y = 0, because the enable is 0.
d. Y = 0, because the select lines indicate that D6 should be selected.
6. The waveforms below are for a 74151 with Quartus pin names. From 800 ns to 1.6 us, which is the value of Y and why?
a. Y is a 1 because the device is not enabled.
b. Y is equal to D1 because the select lines indicate D1 should be selected.
c. Y is equal to D4 because the select lines indicate D4 should be selected.
d. Y is a 0 because the device is not enabled.
7. The waveforms below are for a 74151 with Quartus pin names. From 3.2 us to 4.0 us, which is the value of Y and why?
a. Y is a 1 because the device is not enabled.
b. Y is equal to D3 because the select lines indicate D3 should be selected.
c. Y is equal to D6 because the select lines indicate D6 should be selected.
d. Y is a 0 because the device is not enabled.
8. Download the datasheet from www.ti.com for the SN74LS151 and find the electrical characteristics. Find the values for VIL and VIH. A voltage of 1.1 V is one of the inputs to the 74LS151. How will the 74LS151 interpret that voltage?
a. Logic low
b. Logic high
c. Uncertain region
9. View a datasheet function table for a 74138 device, which can be configured as a demultiplexer. Using Quartus pin names, assume the chip is enabled, the data input is connected to G2AN, C = 0, B = 1, and A = 1. Which output has the data?
a. Y0N
b. Y3N
c. Y4N
d. Y6N
10. Download the datasheet from www.ti.com for the 74LS138. What is the minimum operating temperature for the SN74LS138?
a. -65 C
b. -55 C
c. 0 C
d. 70 C
11. Download the datasheet from www.ti.com for the 74LS138. G2AN is 0 and G1 is 1. Data is applied to G2BN. CBA is 000. Which signal should be observed on Y0N?
a. Data
b. Inverted Data
c. Constant 0
d. Constant 1
12. Download the datasheet from www.ti.com for the SN74LS138 and find the electrical characteristics. Find the values for VIL and VIH. A voltage of 1.1 V is one of the inputs to the 74LS138. How will the 74LS138 interpret that voltage?
a. Logic low
b. Logic high
c. Uncertain region
13. Download the datasheet from www.ti.com for the 74LS138. Match the Quartus input/output pin names on the left with the pin numbers on the right.
Potential Matches:
1 : Pin 13
2 : Pin 7
3 : Pin 3
4 : Pin 5
Answer
: C
: G2BN
: Y2
: Y7
14. Download the datasheet from www.ti.com for the 74LS151. Match the Quartus input/output pin names on the left with the pin numbers on the right.
Potential Matches:
1 : Pin 9
2 : Pin 4
3 : Pin 5
4 : Pin 13
Answer
: D0
: D6
: C
: Y
15. Match the waveforms labeled as OUTPUTx to the appropriate pin on the 74138. Data is applied to G2BN.
Potential Matches:
1 : Y4N
2 : Y7N
3 : Y6N
4 : Y0N
5 : Y2N
6 : Y5N
7 : Y3N
8 : Y1N
Answer
: OUTPUT0
: OUTPUT1
: OUTPUT2
: OUTPUT3
: OUTPUT4
: OUTPUT5
: OUTPUT6
: OUTPUT7