SRAM, latch and flip-flops are used to store the data. how theses memory elements are differ in terms of their applicability?
Dear Sandeep Kumar,
You may want to review the following info:
What is the main difference between latch and flip-flop?
Flip-flop is a bistable device i.e., it has two stable states that are represented as 0 and 1. Latch is also a bistable device whose states are also represented as 0 and 1. It checks the inputs but changes the output only at times defined by the clock signal or any other control signal.
The difference between a latch and a flip-flop is that a latch is level-triggered (outputs can change as soon as the inputs changes) and Flip-Flop is edge-triggered (only changes state when a control signal goes from high to low or low to high).
Is SRAM a latch?
Static random-access memory (static RAM or SRAM) is a type of random-access memory (RAM) that uses latching circuitry (flip-flop) to store each bit. SRAM is volatile memory; data is lost when power is removed.
What are flip-flops in SRAM?
Static RAM (SRAM) consists of flip-flops, a bistable circuit composed of four to six transistors. Once a flip-flop stores a bit, it keeps that value until the opposite value is stored in it. SRAM gives fast access to data, but it is physically relatively large.
A different cell design that eliminates the above limitations is the use of a CMOS flip-flop. In this case, the load is replaced by a PMOS transistor. This SRAM cell is composed of six transistors, one NMOS transistor and one PMOS transistor for each inverter, plus two NMOS transistors connected to the row line.
https://www.geeksforgeeks.org/difference-between-flip-flop-and-latch/
https://www.electronicsforu.com/technology-trends/latch-not-bad-latch-vs-flip-flop
https://electronics.stackexchange.com/questions/30221/sram-and-flip-flops
Dear Sandeep Kumar ,
Flip flops are bistable circuits that can have two output sates either one or zero. Its sate can be changed by binary inputs. There are few types of flip flops according to the requirements of the sequential digital circuits built from them.
They are the basic building blocks of the static memory circuits such as the latch SRAM as well as the counters and shift registers.
The most basic flip flop is the S-R flip flop. This flip flop becomes set with its output Q=1 if a logic one is applied to its S input. It can also reset with Q=0 if one input a logic high at the R input. It is so that the input R=S=1 is not allowed as the sate of the flip flop will not be defined. The SRAM is based on this flip flop in addition to addressing transistor circuits. The set is a write 1 operation and the reset is the write zero operation.
This SR flip flop can be turned also to operate as latch element. Just the one makes always an input logic parameter D = S= R BAR. This means that the the S input is always inverted and input to the reset input. In this way is D=1 a 1 will be written and If D=0 a zer will be written such that Q=D
There are more complicated flip flops to control the flow data in the sequential circuits by clocking for sake of timing and synchronization. These are the J-K flip flops and the delay D flip flop.
Every digital circuit has its function depicted by truth tables. And you must ne able to interpret and understand these truth tables.
In summary the RS flip flop is the basic element of memories and sequential digital circuits built from more complicated flip flops.
Best wishes.
As Latch is one of the condition of the flip flop, in which the given input is latched.
For the basic Flip flop , when there is no change in the present output Q(t+1) compared to previous output - Q(t), the output is called Latched. On this principle D Flip flop is working. inputs of SR flip flop are connected by one inverter and we can get the output as input, called Latch. on the same working principle SRAM is working. Set to write 1 and reset to for 0. When inputs of JK Flip flop are 1, the out put is called no change or latched.
If one wishes to store a bit of information without significant ongoing power consumption, the most compact way to do that is to use two inverters (Latch), which will require an absolute minimum of four transistors to hold the data. Since holding information is generally only useful if one has a means of supplying it in the first place, an SRAM cell will add some additional logic to the four-transistor cell to allow access to it. To switch things "cleanly" without bus contention would require four additional transistors; in practice, it is generally possible to yield acceptable performance with two.
- Badges
- Science topic
- Similar topics
- Correction