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Reference.org
High-threshold logic
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<p>High-threshold logic (HTL), also known as <i>low-speed logic</i> (<i>LSL</i>) or <i>high-level logic</i> (<i>HLL</i>), is a variant of <a href="/facts/Diode%25E2%2580%2593transistor_logic/DmLg6WBK">diode–transistor logic</a> used in environments where noise is very high. </p>