SN75C1168: About slow input specification

Noriaki Fukazawa

Expert 1620 points

Part Number: SN75C1168

Hello Expert,

Thank you for your special support every day.

I have a question about differential driver SN75C1168.

In the Data sheet of P4 , schematic of enable input CMOS circuit,

differential input bipolar circuit is described.

Is there a specification for slow input in each circuit?

If yes, please let me know the allowable value.

Best,Regars.

Fukazawa

over 6 years ago

0 Hao L over 6 years ago

TI__Mastermind 25705 points

Fukazawa,
The CMOS input circuit is for the driver's input, while the bipolar input circuit is for the receiver's input. What value are you interested? The driver input spec is in Page 6 and the receiver input is described in Page 7. Please let me know if you have more questions.
Regards,
Hao

0 Noriaki Fukazawa over 6 years ago in reply to Hao L

Expert 1620 points

Hello Hao-san,

Thank you for your reply!
I understand CMOS＆ZBipolar input circuit specifiction.
Where is the slow input value stated?

Best Regars.
Fukazawa

0 Noriaki Fukazawa over 6 years ago in reply to Noriaki Fukazawa

Expert 1620 points

Hello Hao-san.

Thank you for your support.

I have found the following application notes.

http://www.tij.co.jp/jp/lit/an/scba004d/scba004d.pdf

The slow input value for CMOS & BiCMOS is specified for P3.

If SN75C1168 has no provision for slow input,
Based on the value of 5 μs to 10 μs, should I design in less time?

Best Regars.

Fukazawa

0 Hao L over 6 years ago in reply to Noriaki Fukazawa

TI__Mastermind 25705 points

Fukazawa-san,

Thanks for the information. I understand your concern now. My two cents why it's not an issue: 1) SN75C1168 has 2 channels. Therefore if the throughput current happened, it would not generate the heat problem as bad as a 10 bit or 16 bit device; 2) SN75C1168 works with Mbps data rate, which means rise/fall time of the input data can be around 10s of ns that is far from the slow input region.

Please let me know if you have more questions.

Regards,

Hao

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SN75C1168: About slow input specification