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TL16C2552: I want to use TL16C2552 instead of PC16552D

user6537696
Prodigy 160 points

Part Number: TL16C2552

Dear Sir or Madam,

We are considering using TL16C2552 as an alternative to PC16552D.

I checked RESET compare and Timing and it was okay.

But it still doesn't work.

Has anyone succeeded in the replacement?

Best regards,

Nakatsuka

  • 0
    TI__Guru* 78461 points

    Hi Nakatsuka-san,

    I've assigned this thread to a peer who will try to work with you on the issue. 

    -Bobby

  • 0 in reply to BOBBY
    Prodigy 160 points

    Hi Bobby-san,

    No other alternative found.
    Please support us.

    Regards,
    Nakatsuka

  • 0 in reply to user6537696
    TI__Genius 15345 points

    Hi Nakatsuka-san,

    The pinout for these devices are the same with only a couple name changes. They perform functionally the same things. So in order to better assist you could you explain what the issue is in more detail. Is there a problem with resetting device?

    In the meantime, I'll look through the datasheets and see if anything critical has changed.

    Best,

    Chris

  • 0 in reply to Chris Ayoub
    TI__Genius 15345 points

    Hi Nakatsuka-san,

    So I went through the voltages and timing requirements of the TL16C2552 and noticed some pretty significant changes. For all figures below I am assuming that the TL16C2552 is operating at 5V.

    Voltages,

    • The minimum input clock high for PC16552D is 2V where as for the TL16C2552 it is 0.7*VCC which is 3.5V. This is a significant difference.
    • The maximum VIL for the PC16552D is 0.8V and for the TL it is up to 1.5 volts or 0.3*Vcc. So this is not critical
    • The spec for output low for the PC16552D is 0.4V at 1.6 mA .For the TL16C2552 it is 0.4V at 4mA.
    • The spec for output low for the PC16552D is 2.4V at -1 mA .For the TL16C2552 it is 4V at -4mA.
    • There is less current draw on Vcc for the TL16C2552.
    • All capacitances have changed

    Timing Requirements,

    I am only going to go over a few timing requirement changes but I would recommend looking over these again to make sure they meet the specifications of your system.

    • Read delay and write delay has decreased for TL16C2552. 15ns to 7ns
    • Master Reset Pulse width is double for the TL16C2552. 500ns to 1us
    • Pulse clock high and low is slightly larger on the TL16C2552. 17ns to 18ns

    Let me know if you have any further questions.

    Best,

    Chris

  • 0 in reply to Chris Ayoub
    Prodigy 160 points

    Chris-san,

    Thank you very polite investigation.
    Once again, to confirm the waveform.

    Regards,
    Nakatsuka

  • 0 in reply to user6537696
    TI__Genius 15345 points

    Nakatsuka-san,

    I'm sorry but I am unsure what waveform you are talking about, could you clarify what you mean by waveform?

    Best,

    Chris

  • 0 in reply to Chris Ayoub
    Prodigy 160 points

    Hi Chris-san

     

    It is the current measured value.

    Read delay and write delay will be measured from now on.

     

    VCC: 5V

    Clock VIH 5Vp-p > 3.5V

    Clock VIL 0V < 1.5V

    FREQUENCY 14.7456MHz

    Pulse duration, RESET 1ns < 250ms

    Pulse duration, clock high 24ns > 18ns

    Pulse duration, clock low 25ns > 18ns

     

    Best regards,

    Nakatsuka

  • 0 in reply to user6537696
    TI__Genius 15345 points

    Hi Nakatsuka-san,

    Can you send me the oscilloscope shots you have taken? You can post them here or send them to my email at c-ayoub@ti.com

    On the oscilloscope shots can you make sure to mark which signal is which?

    Best,

    Chris

  • 0 in reply to Chris Ayoub
    TI__Genius 15345 points

    Since this issue is being handled offline I am going to close the thread.