I am not sure what the below symbols of a buffer looking symbol with a rectangle inside are:
This is from this datasheet here on page 11 of 13.
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\$\begingroup\$ This must be a duplicate. \$\endgroup\$– Peter MortensenCommented Oct 14, 2023 at 4:25
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\$\begingroup\$ Related: Schmitt triggers hysteresis symbols \$\endgroup\$– Peter MortensenCommented Oct 14, 2023 at 4:29
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\$\begingroup\$ Candidates: What does this schematic symbol mean (rectangle with two tails, "0.44 VCC_IO" on the bottom, "0.56 VCC_IO" on top)? (2023) and Alien circuit component (2014) \$\endgroup\$– Peter MortensenCommented Oct 14, 2023 at 4:30
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\$\begingroup\$ Related: What does this symbol mean? (like a comparator, but there is another symbol in this triangle) \$\endgroup\$– Peter MortensenCommented Oct 14, 2023 at 4:37
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1\$\begingroup\$ fwiw that's a pretty poor drawing of a schmitt trigger. Easy enough to see when you know what it is, but any less tail and it really would just be a rectangle inside a buffer \$\endgroup\$– 2e0byoCommented Oct 15, 2023 at 18:03
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2 Answers
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strange symbol in this IC block diagram that looks like a rectangle inside a buffer
It's a "Schmitt trigger."
A "Schmitt trigger" is a type of logic gate that provides hysteresis. It is used to convert a noisy input into a clean digital output. The Schmitt trigger has two threshold voltages: an upper threshold (V_T+) and a lower threshold (V_T-). When the input signal crosses the upper threshold, the output changes state, and it doesn't change back until the input drops below the lower threshold. This helps to eliminate noise and provides a stable output, especially for slowly varying or noisy inputs.
answered Oct 12, 2023 at 16:01
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19\$\begingroup\$ Worth mentioning that the "rectangle symbol" is a miniature depiction of the typical hysteresis plot. \$\endgroup\$ Commented Oct 12, 2023 at 16:06
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\$\begingroup\$ @EugeneSh. good point, thanks for adding. \$\endgroup\$ Commented Oct 12, 2023 at 19:19
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Here is a logic inverter with a Schmitt Trigger action:
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3\$\begingroup\$ Nice picture that clearly shows that the "rectangle symbol" is a miniature depiction of the typical hysteresis plot, as @EugeneSh. pointed out \$\endgroup\$– FrodyneCommented Oct 13, 2023 at 11:11