SN74S244: Logic compatibility

Hello,

KEERTHANA S67 said:

In datasheet mention that it will accept 2.5 and 3.3V logic inputs. Can you please confirm it will accept LVCMOS/LVTTL/HCMOS as an inputs? 

Also confirm the part status, EOL, Lead time of this part number?

The SN74S244 supports TTL and TTL-compatible input signals, specifically with V_IH of 2V or more, and V_IL of 0.8V or less. It has an input current requirement of up to

As for availability, you can find which packages are available on the TI website:

Our EOL policy can be found here: [FAQ] When will TI End of Life (EOL) or Obsolete a certain logic device?

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Can you tell me more about your application? For example, loading, data rates, operating voltages, rails available in the system... any information is helpful to select a part.

The "S" family of logic is quite old, and I would usually not recommend to use it in a modern design.  There are typically many better options. It sounds like you don't know what voltage signals are going to be in your system -- is this some kind of universal voltage translation requirement? Do you need the 64mA sink current of the "S" family?

The best solution will most likely be a dual supply voltage translator like the SN74LVC8T245, which allows for up or down translation from 1.65V up to 5.5V, or any values in-between.

Thank you for your reply.

Yes, I need 64mA sink current part for this application. 

I am generating 32MHz, 16MHz and 8MHz clock form 3.3V(LVCMOS logic) PLL and I have to provide this clocks to DSP, which works at 5V (TTL/CMOS logic).

Please confirm can we use "SN74LVC8T245" part to convert the clocks from 3.3V to 5V and vice-versa?

I'm surprised to hear that a modern DSP was designed to work with TTL signals and that it requires 64mA of drive current -- that's quite unusual.

The LVC logic device will not drive a 64mA load, however it will support 32 MHz clock redriving without any problems with a 50pF load. You can do up or down translation from 3.3V to 5V with an LVC translator.