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SN74HCS245: How to understand VT+

Rocky Chen
Expert 7615 points
Part Number: SN74HCS245

Dear,

For example, for 4.5V supply, input logic level is 3.3V, as datasheet said, VT+ range is 1.7V min to 3.15V max, so could it consider 3.3V input as a logic high?

Thanks! 

  • 0
    Guru 279520 points

    All voltages above VT+ are considered high. However, with a 5 V supply, the maximum VT+ is 3.5 V, and the tolerances of your power supply might shift it even higher.

    To convert from 3.3 V to 5 V, use a device with TTL-compatible inputs (AHCT, HCT), or a level shifter.