TL16C2552: I want to use TL16C2552 instead of PC16552D

Hi Bobby-san,

No other alternative found.
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Regards,
Nakatsuka

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

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

Chris-san,

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

Regards,
Nakatsuka

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

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

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

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