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TL16C550D - chip select terminals

Dice-K
Mastermind 7911 points

Other Parts Discussed in Thread: TL16C550D

Hello,
I have a question about TL16C550D.

About chip select terminals (CS0, CS1, /CS2).

Is pull-up resistance at the IC outside necessary?
In addition, is there a resistance element in the IC inside?

Regards,
Dice-K

  • 0
    TI__Mastermind 18655 points
    Hello Dice-K,
    CS0 and CS1 do require to be pulled high, /CS2 do not need pull-up resistor . I will confirm your second question with design team.
    Send a email to joel.jimenez.@ti.com whether you need to check our EVM schematics.
    Regards
  • 0
    TI__Mastermind 29655 points
    Hi Dice-K,

    In a typical application, we expect the CS pins to be driven by an address decoder. However, to prevent the input pins from floating in the event nothing is driving them, it is good practice to use external pull-up/pull-down resistors. Since this is a legacy part, I cannot confirm that there is an internal resistance in the IC, so I advise to stay on the safe side and populate an external resistor.

    Regards,

    Michael