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?
Answer & step-by-step solution
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.
सेमीकंडक्टर मेमोरी के संबंध में निम्नलिखित कथनों पर विचार कीजिए:
1. SRAM डेटा संग्रह के लिए बाइस्टेबल फ्लिप-फ्लॉप का उपयोग करती है और DRAM से तेज़ एक्सेस देती है।
2. DRAM डेटा को कैपेसिटर पर आवेश के रूप में संग्रहीत करती है और डेटा बनाए रखने के लिए आवधिक रिफ्रेश आवश्यक है।
3. उच्च घनत्व के कारण DRAM, SRAM से तेज़ और महँगी है।
उपरोक्त में से कौन-सा/से कथन सही है/हैं?
उत्तर और चरणबद्ध हल
SRAM हर बिट को बाइस्टेबल लैच सेल में रखती है और पावर रहने तक रिफ्रेश नहीं चाहिए, अतः तेज़ है पर अधिक क्षेत्र लेती है। DRAM कैपेसिटर पर आवेश रखती है, रिफ्रेश चाहिए, अधिक घनत्व और प्रति बिट कम लागत देती है पर सामान्यतः SRAM से धीमी है।
परीक्षा फोकस: तेज़/कैश → SRAM; घनी/मुख्य मेमोरी → DRAM।
विस्तृत हल (मूल भाषा में)
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.
સેમિકન્ડક્ટર મેમરી સંબંધિત નીચેના વિધાનો ધ્યાનમાં લો:
1. SRAM ડેટા સંગ્રહ માટે બાયસ્ટેબલ ફ્લિપ-ફ્લોપ વાપરે છે અને DRAM કરતાં ઝડપી એક્સેસ આપે છે.
2. DRAM ડેટાને કેપેસિટર પર વિદ્યુતભાર તરીકે સંગ્રહે છે અને ડેટા જાળવવા સમયાંતરે રિફ્રેશ જરૂરી છે.
3. ઉચ્ચ ઘનતાને કારણે DRAM એ SRAM કરતાં ઝડપી અને મોંઘી છે.
ઉપરોક્તમાંથી કયું/કયા વિધાન સાચું/સાચા છે?
જવાબ અને પગલાવાર ઉકેલ
SRAM દરેક બિટને બાયસ્ટેબલ લેચ સેલમાં રાખે છે અને પાવર ચાલુ હોય ત્યાં સુધી રિફ્રેશની જરૂર નથી, તેથી ઝડપી છે પરંતુ વધુ જગ્યા લે છે. DRAM કેપેસિટર પર વિદ્યુતભાર રાખે છે, રિફ્રેશ જોઈએ, વધુ ઘનતા અને પ્રતિ બિટ ઓછી કિંમત આપે છે પરંતુ સામાન્ય રીતે SRAM કરતાં ધીમી છે.
પરીક્ષા મુદ્દો: ઝડપી/કેશ → SRAM; ઘટ્ટ/મુખ્ય મેમરી → DRAM.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
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.
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