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Definition of "Latch" |
A non-clocked flip-flop. / A circuit designed to store information. A component or circuit that maintains its assumed condition until reset by an external signal. The output of a latch will change when the clock goes high but will not latch until the clock goes low. Latches are considered bad design practice in VHDL because they are unusable in synchronous logic circuits. Refer to the schematic of a Set-Reset Latch in the right side-bar. The following are integrated circuit TTL latches; 7475, 74279, 74259, 74375, 74ALS966, a 4099 CMOS IC latch. / A non clocked flip flop. / In electronics, a flip-flop or latch is a circuit that has two stable states and can be used to store state information. A flip-flop is a bistable multivibrator. The circuit can be made to change state by signals applied to one or more control inputs and will have one or two outputs. It is the basic storage element in sequential logic. Flip-flops and latches are a fundamental building block of digital electronics systems used in computers, communications, and many other types of systems. / A crossbar latch, also called a molecular crossbar latch, is a nanoscale device with properties similar to those of a conventional silicon transistor, but physically much smaller, having a diameter of approximately 2 nanometers. The crossbar latch is expected to find applicability in nanoscale computing. It may someday supplant the transistors currently found in computer chips. / a small temporary holding cell for a value, the value on the input wires is buffered upon occurrence of some event, such as a clock pulse or rising edge of a separate latch signal. |
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