SN75LVCP601: DEx and EQx pins

Shuji Ishiwata

Part Number: SN75LVCP601

Hi All,

I have a question about the DEx and EQx pins of SN75LVCP601.

The DEx and EQx terminals are connected internally at 2/VCC.
When VCC=3.3V, it becomes 1.65V.
In the case of NC, the DEx and EQx terminals are 1.65V, so wouldn't the DEx and EQx settings be High (=1)?

Best Regards,
Ishiwata

5 months ago

0 David (ASIC) Liu 5 months ago

TI__Guru*** 149805 points

Ishiwata-san

The EQ and DE pins include both internal pullup and pulldown to create a VCC/2 level for NC.

Thanks

David

0 Shuji Ishiwata 5 months ago in reply to David (ASIC) Liu

Mastermind 6085 points

David-san,

Thank you for your reply.
When the EQ pin and DE pin are NC, it is VCC/2, so it becomes a logic high level (VIH = 1.4V (min)).

Is my understanding wrong?

Or isn't VIH of EQ pin and DE pin = 1.4V?

Best Regards,
Ishiwata

0 David (ASIC) Liu 5 months ago in reply to Shuji Ishiwata

TI__Guru*** 149805 points

Ishiwata-san

These values are based upon a microcontroller driving the control pins. The pullup/pulldown/floating resistor configuration will set the internal bias to the proper voltage level which will not match the values shown here.

Thanks
David

0 Shuji Ishiwata 5 months ago in reply to David (ASIC) Liu

Mastermind 6085 points

David-san,

Thank you for your reply.

I understand that it is set correctly with internal bias.
What are the VIH values for the EQ and DE pins?

Best Regards,
Ishiwata

+1 David (ASIC) Liu 5 months ago in reply to Shuji Ishiwata

TI__Guru*** 149805 points

Ishiwata-san

I can't share the internal VIH value for the EQ and DE pins. You would need to use external 4.7kohm pullup to set the pins to '1' and 4.7kohm pulldown to set the pins to '0'.

Thanks

David

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SN75LVCP601: DEx and EQx pins