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TTL, 5V CMOS and LVTTL Levels

Colors legend

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

Voltage levels

VIL: maximum low-state voltage @receiver input
VIH: minimum high-state voltage @receiver input
VOL: maximum low-state voltage @driver output
VOH: minimum high-state voltage @driver output
Vt: threshold level, typically at the middle of the transition range

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