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What is Semiconductor Memory?

Device Principle (SRAM)

■Memory Cell Structure
  • 6-Transistor Cell Configuration
  • 4-Transistor Cell Configuration (High Resistive Load Cell Type)
Low Power and High Density Types

Low Power Type

High Density Type

■Data Write Method

[In the Case of '1']

  1. Word Line potential is High
  2. Assign a potential to the Bit Line (D=Low, D=High)
    → The state of the flip-flop
  3. Word Line potential is Low
■Data Read Method

[In the Case of '1']

  1. Word Line potential OFF
  2. Bit Line precharge (same potential as D, D)
  3. Word Line potential is High
  4. If the Bit Line is Low the conditions will be High
  5. Amplified by the sense amp
1状態と0状態の比較

The state of '1'

The state of '0'

'0', '1' stored by the flip flop circuit

Electronics
Fundamentals