Digital Electronics MCQ Questions & Answers | ECE

First, we need to calculate the total number of bits per character.
We have:
- 8 data bits
- 1 parity bit
- 1 start bit
- 2 stop bits
So, the total bits per character = 8 + 1 + 1 + 2 = 12 bits.
Now, we know the communication line transmits at 1200 BPS (bits per second).
To find the number of characters per second (CPS), we divide the BPS by the bits per character:
CPS = 1200 BPS / 12 bits/character = 100 characters/second.
Therefore, the correct answer is 100 CPS. Option A is the correct answer.

CPLDs (Complex Programmable Logic Devices) need many pins to connect to other parts of a circuit.
Think of it like this: pins are like roads connecting different cities.
We want as many roads as possible to allow lots of traffic (data) to flow.

Here's a look at the packaging options:
PLCC (Plastic Leaded Chip Carrier): Uses J-shaped leads around the edges. Good, but limited pin density.
QFP (Quad Flat Package): Has flat leads extending from all four sides. Better than PLCC, but still limited compared to BGA.
PGA (Pin Grid Array): Has pins arranged in a grid pattern that insert into a socket. Allows more pins than PLCC and QFP, but BGA is superior.
BGA (Ball Grid Array): Uses tiny solder balls on the bottom of the package. These balls are much smaller and closer together than pins, allowing for a much higher density of connections.

Because the solder balls are so small and densely packed, BGA packaging allows for the maximum number of pins on a CPLD package.
So, BGA is the answer because it gives the most "roads" (pins) to connect the CPLD to the rest of the circuit!