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SN74HC4851: Which IC to choose? 4351 or the 259?

Rahul S63
Prodigy 180 points
Part Number: SN74HC4851

I am a newbie, trying to fit components for a simple multiplexing application.

In the application, I need to use an 1:8 MUX to send an analog  AND/OR digital signal < 3.3V from a single port to multiple ones (one at a time) and then latch it.

How, I have referred to both the 529 and the 4351 ICs. Which one should I prefer and why? Either chips contain a latch and both are High speed CMOS. Moreover, their supply voltages too seem not to be differing b y much.

Can somebody help me make the correct choice?

And BTW< how does the 4351 differ from 4851? Is this a new version?

  • 0
    TI__Genius 9132 points

    Hi Rahul,

    I had a few questions to get some clarification:

    • Can you clarify which 529 or 259 device you are referring to?  I can then look into the Standard logic portfolio to see if they have any device under this name.
    • Can you provide details on how you latch the 8 outputs using 1:8 MUX. 

    Difference between 4351 and 4851: Main difference is between the RON.

    • SN74HC4851 is an 8-Channel Analog Multiplexer/Demultiplexer with Injection-Current Effect Control and offered in multiple packages. RON (Typ)  for this device is 150 Ohms
    • CD74HCT4351High Speed CMOS 8-Channel Analog Multiplexer/Demultiplexer with Latch - RON (Typ) for this device is 40 Ohms.

    See the comparison table below for the 2 switches.

  • 0 in reply to Saminah C
    Prodigy 180 points

    Apologies. I did mean the HC259.

    Both the 74HC259 and the 74HC4351 feature a latch and both of them are 1:8

    Is it possible that the header/subject of this thread be changed? I realize they typo (4851 instead of 4351) after I had completed the question when I created it.

    Thanks for the response

    Rahul