The difference between a latch and a flip-flop is that a latch does not have a clock signal, whereas a flip-flop always does.
Apart from the clock signal difference,
~ Latch is a level sensitive device while flip-flop is an edge sensitive device.
~ Latch is sensitive to glitches on enable pin, whereas flip-flop is immune to glitches.
~ Latches take less gates (also less power) to implement than flip-flops.
~ Latches are faster than flip-flops.
A needle is a small, thin object that has a sharp and pointed end. On the other hand, latch needle is the part of a knitting machine having a thin shaft with a hook on one end.
Er... you press on it and see. If you can press on the release bar with 90 N of force (basically 9 kg or 20 lb) for 15 seconds without the door opening, it fails. This includes the pressure of the door latch release and any spring/hydraulic door closer. (For the latter, only force to initial travel is an issue, not force to open wide.) You can often get a statement from a manufacturer, but you can also measure directly: just get a cheap postal scale with enough capacity, turn it on its side, and press with it. Multiply the reading by 9.8 N/kg. That won't be super-accurate, but as long as the measured force is below 90 N with more safety margin than the inaccuracy of your measurement, you've proved it. (Don't forget that the scale will read low, i.e. negative, when turned on its side, so you have to re-zero it or mathematically adjust for the negative starting point of the measurement.) As a practical matter, most fire door hardware is far enough below the limit that a very crude measurement is sufficient; the fire inspector just presses on it with his or her "calibrated arm" and can tell that there's no need to measure more precisely. If you're working close to the limit, the NRC probably knows about test procedures.
latch is electronic circuit.....
static latch: a latch without capacitor dynamic latch: latch with capacitor
In electronics, a flip-flop or latch is a circuit that has two stable states and can be used to store state information. The circuit can be made to change state by signals applied to one or more control inputs and will have one or two outputs. Flip-flops and latches are a fundamental building block of digital electronics systems used in computers, communications, and many other types of systems.
i need to understand the meaning of latch as applied in logic gates [digital ectronics]
catch for fastening a door or gate [here's a sentence ;you should really latch the door.In electronics, a latch (or flip-flop) is a circuit that has two stable states and can be used to store state information. The circuit can be made to change state by signals applied to one or more control inputs and will have one or two outputs. Flip-flops and latches are a fundamental building block of digital electronics systems used in computers, communications, and many other types of systems.
A latch is a type of flip-flop circuit that is used to store digital information in a microprocessor or other digital system. A latch is essentially a digital memory element that can hold a single bit of information (i.e. a "1" or "0"). Latches can be used to store data that needs to be held temporarily, such as the current state of a program, or to create a temporary buffer for data that is being moved between different parts of a system.
FF-sincron L-asincron level sensitive and edge sensitive
Latch are 1 bit memory element. it will become flip flop if you use a clock control in latch latch is a level triggered device which is used to store the digital data only. and on the other ways for sequential circuit design we use flip flops.
An electronic latch is a simple bi-stable state-holding circuit. That means it has two stable "states", kind of like a light switch (ON and OFF). Once the latch is switched ON, it will stay there until it is switched OFF or until power is lost, and vice-versa. Latches can be built in a variety of ways, but the most commonly studied latch is the S-R latch made with NAND or NOR gates. In this latch, "SET" is the name of one state, and "RESET" is the other state: http://www.play-hookey.com/digital/rs_nand_latch.html Latches can be used to build memory circuits in digital systems. There are millions of latch circuits in a computer system.
A LATCH can be said as the another name of flip flop as the only difference between a latch and the flip flop is that a latch is an level triggered device where as flip flop is an edge triggered device .
Generally speaking, a latch is a device that will respond to an input level (logic high or low) whereas a flip-flop will only respond to its inputs when the proper triggering edge (transition between logic levels) is applied. Be cautious as some people use the terms interchangeably.
A latching circuit is a circuit with two stable states, which one can think of as 1 and 0, thereby being able to store one bit of information. In circuit diagrams, these are represented by cross-coupled NOR or NAND logic gates.