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SN74AHC595: the difference of SN74AHC595 and SN74AHCT595

TS Yang
Genius 4800 points
Part Number: SN74AHC595
Other Parts Discussed in Thread: SN74AHCT595

Hi,

There are two types of devices  SN74AHC595 and SN74AHCT595.

Can anyone explain the difference of these two devices?

I'm reviewing datasheets, and cannot find anything until now.

thanks,

TS

  • 0
    TI__Guru* 96742 points

    Hi TS,

    The 'T' in SN74AHCT595 indicates that the inputs are 'TTL compatible' -- which basically just means that you can input anything >= 2V for a 'high' input, or <= 0.8V for a 'low' input.

    The SN74AHC595 has standard CMOS inputs.  Note that the CMOS inputs require at least 3.85V for a 'high' input voltage and <= 1.65V for a 'low' input. (assuming a VCC = 5.5V)