Flip-Flops Flashcards
What are the two main categories of bistable devices ?
Latch and Flip-Flop
How many stable states do bistable devices have ?
Two
What are the two stable states of a bistable device ?
SET and RESET
How long can a bistable device retain a state ?
Indefinitely
How does this help ?
It works as a storage device
What are some devices which use bistability, apart from latches and flip flops ?
Relaxation oscillators, Multivibrators and Schmitt Triggers
How many states do flip flops and latches have ?
Two (They are bistable devices)
What is the basic difference in between a latch and a flip flop ?
It is the way in which they change from one state to another
What are flip flops the building block of ?
Counters and registers
How many stable states does a monostable multivibrator have ?
Only one
What does a monostable multivibrator do when triggered ?
Produces a controlled width pulse
How many controlled width pulses does a monostable multivibrator produce when triggered ?
One
How many stable states does an astable multivibrator have ?
None.
What is an astable multivibrator used for ?
Oscillators primarily
What are used as sources for timing waveforms in digital waveforms ?
Pulse oscillators
Are flip flops synchronous or asynchronous ?
Synchronous
Why are flip flops called synchronous bistable devices ?
The output changes in synchronisation with clock (CLK)
When does an edge triggered flip flop change state ?
Either at positive(rising) or negative(falling) edge
What does a positive edge mean ?
The clock signal rises at that point
What is the triangle used to represent clock signals in block diagrams known as ?
Dynamic input indicator
Why is a D flip flop synchronous ?
The input is transferred to output only on the triggering edge
What type of RAM uses flip flops ?
SRAM (Static Random Access Memory)
Why is SRAM called volatile memory ?
It retains memory as long as DC power is applied
What is an alternative to SRAM ?
DRAM (Dynamic RAM)
