D-Type Flip-Flops — Sequential Logic & Memory
Learn how D-type flip-flops store a single bit of data, how the clock edge triggers updates, and their role in registers and memory.
📚 Learning Steps
💡 Study Tips
- • Read through at your own pace
- • Try the interactive simulators hands-on
- • Study the pseudocode — it appears in exams
- • Quiz yourself before moving on
Step 1: Combinational vs Sequential Logic
📖 TheorySo far you've seen combinational logic — logic gates where the output depends ONLY on the current inputs (e.g., AND, OR, adders).
Sequential logic is different: the output depends on the current inputs AND the previous state. This gives circuits memory — they can "remember" values.
Why does this matter?
•Combinational circuits can compute but cannot STORE results
•Sequential circuits can store data — essential for registers, counters, and memory
•The fundamental building block of sequential logic is the flip-flop
A flip-flop stores a single bit (0 or 1) and only changes its stored value when triggered by a clock signal. This is how computers store data at the hardware level.
🎯 Key Points
- •Combinational logic: output depends only on current inputs
- •Sequential logic: output depends on inputs AND previous state
- •Sequential logic provides MEMORY — circuits can store data
- •Flip-flops are the fundamental building block of sequential logic
- •A flip-flop stores exactly 1 bit
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