Consider the following statements regarding Semiconductor Memories:1.SRAM uses bistable flip-flops for data storage and offers faster access speed compared to DRAM.2.DRAM stores data as charge on capacitors and requires periodic refreshing to maintain data integrity.3.DRAM is faster and more expensive than SRAM due to its higher density.Which of the above statements is/are correct?

Correct Answer: A - 1 and 2 only

Quick Concept Explanation

SRAM stores each bit in a bistable latch/flip-flop-like cell and does not need refresh while powered, giving fast access at the cost of area. DRAM stores charge on a capacitor, requires periodic refresh, and achieves higher density and lower cost per bit but is generally slower than SRAM.

Exam focus: Fast/cache → SRAM; dense/main memory → DRAM. Common trap: DRAM is not faster or more expensive per bit than SRAM.

Statement-wise Verification

• Statement 1 - Correct.
  SRAM uses bistable flip-flops for data storage and offers faster access speed compared to DRAM.
  SRAM stores each bit in a bistable latch/flip-flop-like cell and does not need refresh while powered, giving fast access at the cost of area.
• Statement 2 - Correct.
  DRAM stores data as charge on capacitors and requires periodic refreshing to maintain data integrity.
  DRAM stores charge on a capacitor, requires periodic refresh, and achieves higher density and lower cost per bit
• Statement 3 - Incorrect.
  DRAM is faster and more expensive than SRAM due to its higher density.
  SRAM is faster and more expensive per bit; DRAM is denser and requires refresh

Core Concept

SRAM stores each bit in a bistable latch/flip-flop-like cell and does not need refresh while powered, giving fast access at the cost of area. DRAM stores charge on a capacitor, requires periodic refresh, and achieves higher density and lower cost per bit but is generally slower than SRAM.

Formula / Key Relationship

SRAM: no refresh; DRAM: capacitor + refresh.

Why the Other Options Are Wrong

Option B is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1. Option C is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 2. Option D is incorrect because it includes incorrect statement(s) 3.

Exam Shortcut / Approach

Fast/cache → SRAM; dense/main memory → DRAM.

Common Mistake

DRAM is not faster or more expensive per bit than SRAM.

Quick Revision

Static versus Dynamic RAM is linked with SRAM and DRAM, Memories and Digital Electronics. Fast/cache → SRAM; dense/main memory → DRAM.