SCHMITT
Schmitt-trigger buffer
A non-inverting digital element with separate rising and falling input thresholds.
Schematic
Symbols · SCHMITT-NOT
Schmitt-trigger inverter
A digital inverter with hysteresis between its input switching thresholds.
Schematic · SCHMITT-NOT
What it represents
A digital inverter with hysteresis between its input switching thresholds.
On a schematic, identify the input waveform, threshold convention and supply domain and trace the cleaned/inverted digital signal. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
Input hysteresis and logical inversion are separate properties; neither makes an arbitrary slow input safe for every logic family.
Terminal letters describe electrical roles, not package pin numbers. Check the selected public datasheet for the actual pin assignment, polarity and any internally connected terminals before completing the drawing.
How to read it
- Identify the input waveform, threshold convention and supply domain.
- Trace the cleaned/inverted digital signal.
Information to show or reference
- Label the input waveform, threshold convention and supply domain.
- Cross-reference the cleaned/inverted digital signal.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.
A distinction that matters
Input hysteresis and logical inversion are separate properties; neither makes an arbitrary slow input safe for every logic family.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
SN74HC14 — Schmitt-trigger inverters
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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