WDT
Watchdog timer
Supervises a qualifying activity signal and operates its output when the documented watchdog timing condition is violated.
Schematic
Symbols · ONE-SHOT
Retriggerable monostable
Produces a timed output pulse that can be extended by a qualifying retrigger condition.
Schematic · ONE-SHOT
What it represents
Produces a timed output pulse that can be extended by a qualifying retrigger condition.
On a schematic, identify the trigger polarities, clear input and timing components and trace the pulse/complemented outputs and timed control use. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
A retriggerable one-shot differs from a non-retriggerable pulse generator or a free-running oscillator.
The preview is an independently drawn educational functional reference. Add the selected component’s actual power pins, terminal numbers, timing or analogue reference details when producing a construction drawing.
How to read it
- Identify the trigger polarities, clear input and timing components.
- Trace the pulse/complemented outputs and timed control use.
Information to show or reference
- Label the trigger polarities, clear input and timing components.
- Cross-reference the pulse/complemented outputs and timed control use.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.
A distinction that matters
A retriggerable one-shot differs from a non-retriggerable pulse generator or a free-running oscillator.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
CD74HC123 — retriggerable monostables
Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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