TL16C752D: Difference between TL16C752D and TL16C754C

Ryu Yamashita

Part Number: TL16C752D
Other Parts Discussed in Thread: TL16C754C,

Tool/software:

Hi team,

I saw in other threads that the difference between TL16C752D and TL16C754C is that they are bugfixed or not, but when I actually ran them, I found the following differences
The TL16C752D and TL16C754C have BIT 4 in the Alternate Function Register (AFR). The manual states that if this BIT is 0, the receive timeout interrupt is disabled.
However, when I actually ran both chips in RS-232 mode, the TL16C754C followed the manual, but the TL16C752D enabled the receive timeout interrupt even when AFR[4] was set to 0.
Is this a difference depending on the model number?
I would like to know all such minor differences as much as possible.

Best Regards,
Ryu.

3 months ago

0 BOBBY 3 months ago

TI__Guru 72771 points

Hi Ryu,

Unfortunately we don't have a guide on the actual small differences between the two devices. The C version of the device was made in an older process technology that TI designers don't use anymore. The newer D version is in a newer process technology. Moving from one process technology to another is not a copy paste type of application. The designers had to redesign the device from a FET level since the FETs from the two designs are different and the verilog files for the old device weren't available. So the D version is an attempt to fix old issues while trying to make the rest of the design exact to the old version (But the verilog files to make the digital design from the old design weren't used).

-Bobby

0 Ryu Yamashita 3 months ago in reply to BOBBY

Genius 3665 points

Hi BOBBY,

Thanks for the reply.
I understood about the difference.
Can you please confirm that the TL16C752D is in fact as I have indicated?
Also, if I am correct, can you modify the TRM?

Best Regards,
Ryu.

0 Ryu Yamashita 3 months ago in reply to Ryu Yamashita

Genius 3665 points

Hi BOBBY,

Could you please reply?

Best Regards,
Ryu

0 BOBBY 3 months ago in reply to Ryu Yamashita

TI__Guru 72771 points

Hi Ryu,

From what I can see, the device seems to be following the statement in table 21 of the datasheet

"Receive threshold and error detection interrupts available Data stored in receive FIFO " For RCVEN=0, AFR=00, RS232 mode.

It looks like it's ignoring the note from Table 20...

Ryu Yamashita said:
Also, if I am correct, can you modify the TRM?

Do you mean modify the die? Changing something like this isn't something we can do, unfortunately.

-Bobby

0 Ryu Yamashita 3 months ago in reply to BOBBY

Genius 3665 points

Hi Bobby,

I am concerned that the behavior is different even though they have the same description on the datasheet.
We would like confirmation that this behavior is different when it actually operates at your company.
Also, if the behavior is different, is it possible to correct the datasheet?

Best Regards,
Ryu

0 BOBBY 3 months ago in reply to Ryu Yamashita

TI__Guru 72771 points

Ryu,

I'll need to see if I can get a design engineer to take a look at this from their environment to confirm it. (This may take time as we need to locate the design file which hopefully we can....).

Yes we can confirm this, then we can make a datasheet update to Omit table 20's statement.

-Bobby

0 Ryu Yamashita 3 months ago in reply to BOBBY

Genius 3665 points

Hi Bobby,

When will you be able to confirm this?

Best Regards,
Ryu

0 Ryu Yamashita 2 months ago in reply to Ryu Yamashita

Genius 3665 points

Hi Bobby,

I am waiting for your reply.

Best Regards,
Ryu

0 BOBBY 2 months ago in reply to Ryu Yamashita

TI__Guru 72771 points

Ryu,

I'm waiting on the designer to get back to me.

-Bobby

0 BOBBY 2 months ago in reply to Ryu Yamashita

TI__Guru 72771 points

Hi Ryu,

I got confirmation from the designer, the AFR bit 4 only controls receiving data and does not affect interrupts. So what you are seeing from the D version of this device is expected.

-Bobby

0 Ryu Yamashita 2 months ago in reply to BOBBY

Genius 3665 points

Hi Bobby,

What does that mean?
Does it mean that the model number makes no difference?
Does it mean that my verification was wrong?

Best Regards,
Ryu

0 BOBBY 2 months ago in reply to Ryu Yamashita

TI__Guru 72771 points

It means that the datasheet is incorrect and the verification you did is correct. The RX interrupts is not disabled with AFR bit 4.

-Bobby

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TL16C752D: Difference between TL16C752D and TL16C754C