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The term flip-flop has historically referred generically to both level-triggered (asynchronous, transparent, or opaque) and edge-triggered (synchronous, or clocked) circuits that store a single bit of data using gates. [1] Modern authors reserve the term flip-flop exclusively for edge-triggered storage elements and latches for level-triggered ones.
The output of a flip-flop is constant until a pulse is applied to its "clock" input, upon which the input of the flip-flop is latched into its output. In a synchronous logic circuit, an electronic oscillator called the clock generates a string (sequence) of pulses, the "clock signal".
AND gated J-K master-slave flip-flop, asynchronous preset and clear (improved 74L72) (16) BL54L67Y: 74L68 2 dual J-K flip-flop, asynchronous clear (improved 74L73) (18) BL54L68Y: 74LS68 2 dual 4-bit decade counters 16 SN74LS68: 74L69 2 dual J-K flip-flop, asynchronous preset, common clock and clear (18) BL54L69Y: 74LS69 2 dual 4-bit binary ...
This dual threshold action is called hysteresis and implies that the Schmitt trigger possesses memory and can act as a bistable multivibrator (latch or flip-flop). There is a close relation between the two kinds of circuits: a Schmitt trigger can be converted into a latch and a latch can be converted into a Schmitt trigger.
Gate-level Diagram of a Clocked NAND-gate SR Flip-flop: Date: 17 June 2006: ... Digital Circuits/Latches; Electronics/Latches and Flip Flops; Electronics/Print Version;
A multivibrator is an electronic circuit used to implement a variety of simple two-state [1] [2] [3] devices such as relaxation oscillators, timers, latches and flip-flops. The first multivibrator circuit, the astable multivibrator oscillator, was invented by Henri Abraham and Eugene Bloch during World War I. It consisted of two vacuum tube ...
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. The static qualifier differentiates SRAM from dynamic random-access memory (DRAM):
Since a gated latch uses only four gates versus six gates for an edge-triggered flip-flop, a two phase clock can lead to a design with a smaller overall gate count but usually at some penalty in design difficulty and performance. Metal oxide semiconductor (MOS) ICs typically used dual clock signals (a two-phase clock) in the 1970s.