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SN74HC08-Q1: SN74HC08 VIH & VIL Level at VCC = 5V

Part Number: SN74HC08-Q1
Other Parts Discussed in Thread: SN74HC08

Hi team,

Could you please check what are the VIH & VIL levels for SN74HC08 with VCC = +5V? The datasheet only specified VCC =3, 4.5 and 6V. 

Many  thanks.

Best Regards,

Wei-Hao Chen

  • Hello Wei-Hao,

    I want to mention first that VIH and VIL are not threshold values.  You might already know this, but I see many of our customers get confused by this, and I want to make sure it is mentioned first.  These are input noise margin limits.

    Note that the given datasheet values are exactly 0.3 VCC (for the VIL spec) and 0.7 VCC (for the VIH spec). At 5 V, these values are:

    VIH = 3.5 V

    VIL = 1.5 V