MCQOPTIONS
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MCQOPTIONS
| 1. |
What must be done to interface CMOS to TTL? |
| A. | A dropping resistor must be used on the CMOS 12 V supply to reduce it to 5 V for the TTL. |
| B. | As long as the CMOS supply voltage is 5 V, they can be interfaced; however, the fan-out of the CMOS is limited to two TTL gates. |
| C. | A 5 V Zener diode must be placed across the inputs of the TTL gates in order to protect them from the higher output voltages of the CMOS gates. |
| D. | The two series cannot be interfaced without the use of special interface buffers designed for that purpose, such as the open-collector buffers. |
| Answer» C. A 5 V Zener diode must be placed across the inputs of the TTL gates in order to protect them from the higher output voltages of the CMOS gates. | |