Question

Match the columns.

Pin	Description
a. D0-D7	1. Reset Input
b. RESET	2. Data Lines
c. A0,A1	3. Internal Address

1. a - 2, b - 1, c - 3
2. a - 1, b - 2, c - 3
3. a - 2, b - 3, c - 1
4. a - 1, b - 3, c - 2

Answer 1

Correct Answer - Option 1 : a - 2, b - 1, c - 3

In a digital IC's pin name/representation corresponds to their operation.

D₀ - D₇ →  These are called data pins i.e. 8 input data pins

• These are bi-directional buses.
• These carry data in binary 1 or 0.
• The output will be 5V for binary 1 or 0 V for binary 0.

RESET → Corresponds to RESET pin 

• RESET IN pin is used to reset the program counter toward zero and
• Rearranges interrupt enable as well as HLDA flip-flops (FFs).
• The central processing unit is detained in RST condition till this pin is high.
• The registers, as well as flags, won’t get damaged apart from the instruction register.

A₀ - A₁ → These are 2 address pins of an IC's

• During the execution of the instruction, these lines carry the address bit.
• These are used to carry the address of data and instruction from the processor to the memory location.
• The address bus is unidirectional.

VCC → Voltage Common Collector or VCC refers to the input DC supply voltage 

GND → Ground or GND refers to the supply ground terminal

Y₀ - Y₁ or O₀ - O₁ → These refers to the 2 output pins of any digital IC's