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SN74LS373: What Technology?

Genius 14569 points
Part Number: SN74LS373
Other Parts Discussed in Thread: SN74AHCT373, SN74LV373AT, SN74LVC373A, SN74AHC373

Hi Experts,

Good day. Need your confirmation.

Does SN74LS373 (from LS family) a bipolar based technology or CMOS?

Thank you.

Regards,
Archie A.

  • Hi Archie,

    Bipolar.

    The "Logic Guide" includes this type of information and is a handy reference to have for other logic questions: Logic Guide 

    -

    Here's a snippet:

  • Hi Emrys,

    Thanks for sharing the relevant guide.

    Client is also asking an alternative for SN74LS373N, I have this (LINK) filtered list from our portfolio, can you confirm which are suitable?

    Thank you!

    Regards,
    Archie A.

  • Hi Archie,

    It depends.

    What's connected to the device?

    More specifically:

    What does the input signal look like (waveform is best, at 100ns/div or smaller time scale)?

    What is the load? Usually a schematic will help, but won't include 100% of the details.

    Do they need a pin-to-pin replacement (ie zero board changes)?

    I'd tell them to take the opportunity to update their logic to something that's not so outdated and power hungry... but I know that's not always an option.

  • Without more information, the alternative should have TTL-compatible inputs. The devices in the most modern CMOS families also happen to be the cheapest ones. Use the SN74AHCT373 or SN74LV373AT (the latter has higher drive strength).

    If the customer moves to lower supply voltages, use devices with plain CMOS inputs, e.g., SN74AHC373 or SN74LVC373A.