DECADE
Decoded decade counter
Advances a decoded output sequence through the documented ten-state counter arrangement.
Schematic
IEC · CTR DIV10
IEC decade counter (CTR DIV10)
IEC counter marked CTR DIV10, counting through ten states with BCD-weighted outputs.
In plain English
What does IEC decade counter (CTR DIV10) mean?
CTR DIVm identifies a counter whose cycle length is m. A decade counter is therefore CTR DIV10, with outputs weighted 1, 2, 4 and 8 for a BCD count from 0 to 9. The carry output is often marked CT=9 to show it is active at the last state.
A simple example
Decade counters drive numeric displays through BCD-to-seven-segment decoders and form decimal dividers in timing circuits. A drafter cascading stages should show the CT=9 carry feeding the enable of the next decade.
What the drawings help you do
This differs from a decoded one-of-ten counter, which provides ten separate outputs rather than a BCD code. Check the outputs before assuming either form.
This particular reference
IEC counter marked CTR DIV10, counting through ten states with BCD-weighted outputs. The decoded decade counter has ten one-hot outputs rather than BCD-weighted outputs.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Overview of IEEE Standard 91-1984: explanation of logic symbols (SDYZ001A)
IEC · Rectangular element with the CTR DIVm qualifier, m = 10
Qualifying-symbol and dependency conventions as explained in TI's public overview of IEEE Std 91-1984, which incorporates IEC 617-12 work. Independent educational drawing; not certified IEC geometry or an IEC database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · CTR DIV10
What it represents
CTR DIVm identifies a counter whose cycle length is m. A decade counter is therefore CTR DIV10, with outputs weighted 1, 2, 4 and 8 for a BCD count from 0 to 9. The carry output is often marked CT=9 to show it is active at the last state.
Decade counters drive numeric displays through BCD-to-seven-segment decoders and form decimal dividers in timing circuits. A drafter cascading stages should show the CT=9 carry feeding the enable of the next decade.
This differs from a decoded one-of-ten counter, which provides ten separate outputs rather than a BCD code. Check the outputs before assuming either form.
How to read it
- DIV10 states a cycle of ten.
- CT=9 marks the carry used to cascade decades.
Information to show or reference
- Use CTR DIV10 rather than CTR4 for BCD counters.
- Show BCD output weights.
- Show cascading between decades.
A distinction that matters
The decoded decade counter has ten one-hot outputs rather than BCD-weighted outputs.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Overview of IEEE Standard 91-1984: explanation of logic symbols (SDYZ001A)
Defines CTR DIVm and contents outputs such as CT=9.
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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