TTL, 5 V CMOS and LVTTL Levels

Colors legend

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Dark gray: noise margin,

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Light gray: transition range, low and high level are unspecified

Voltage levels

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VIL: maximum low-state voltage @receiver input

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VIH: minimum high-state voltage @receiver input

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VOL: maximum low-state voltage @driver output

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VOH: minimum high-state voltage @driver output

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Vt: threshold level, typically at the middle of the transition range