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The 555 timer IC is an integrated circuit used in a variety of timer, delay, ... Active-low SR latch symbol, but lacks /Q output
The signal delay of a wire or other circuit, measured as group delay or phase delay or the effective propagation delay of a digital transition, may be dominated by resistive-capacitive effects, depending on the distance and other parameters, or may alternatively be dominated by inductive, wave, and speed of light effects in other realms.
A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software.
Another important timing value for a flip-flop is the clock-to-output delay (common symbol in data sheets: t CO) or propagation delay (t P), which is the time a flip-flop takes to change its output after the clock edge. The time for a high-to-low transition (t PHL) is sometimes different from the time for a low-to-high transition (t PLH).
A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall lights, stokers, and oil and gas burners." A consumer version was added in 1952.
The group delay and phase delay properties of a linear time-invariant (LTI) system are functions of frequency, giving the time from when a frequency component of a time varying physical quantity—for example a voltage signal—appears at the LTI system input, to the time when a copy of that same frequency component—perhaps of a different physical phenomenon—appears at the LTI system output.
Latency, from a general point of view, is a time delay between the cause and the effect of some physical change in the system being observed. Lag, as it is known in gaming circles, refers to the latency between the input to a simulation and the visual or auditory response, often occurring because of network delay in online games.
The symbols Δt and ΔT (spoken as "delta T") are commonly used in a variety of contexts. Time. ΔT (timekeeping) the difference between two time scales, ...