SN75LVCP601: Does DEW2 have internal PU/PD resistors?

Ronnie Hughes

Part Number: SN75LVCP601

Do the control pins on the SN74LVCP601 have internal pull-up and/or pull-down resistors, specifically DEW1, DEW2, DE1, DE2, EQ1, and EQ2?

over 5 years ago

0 Ronnie Hughes over 5 years ago

TI__Expert 3080 points

Customer was told by their ODM FAE that by not-populating the resistor that the device would use the default setting. We need confirmation if this is true or not.

0 Brian Zhou over 5 years ago in reply to Ronnie Hughes

TI__Guru** 105055 points

internal has both PU and PD. when default it is 1/2 Vcc

0 Ronnie Hughes over 5 years ago in reply to Brian Zhou

TI__Expert 3080 points

I see on the EVM the DEW1 & DEW2 have jumpers to select between a direct connection to GND and a 4.7K connection to VCC. Therefore, from that and your answer, I assume an external connection is necessary to clearly define whether the pin is a logic 0 or 1. True?

0 Lee Sledjeski over 5 years ago in reply to Ronnie Hughes

TI__Mastermind 43795 points

Hi Ronnie,

There is an internal pull-up on DEW. The Input leakage Low limit is 10x the input leakage High specification.
The EQ and DE pins include both internal pullup and pulldown to create a VCC/2 level for NC.

Regards,
Lee

0 Ronnie Hughes over 5 years ago in reply to Ronnie Hughes

TI__Expert 3080 points

Also, what is the De-emphasis pulse duration at this ½ Vcc level? The datasheet just shows a long and short setting.

0 Lee Sledjeski over 5 years ago in reply to Ronnie Hughes

TI__Mastermind 43795 points

Hi Ronnie,

The DEW signal has only two valid states.
1 - Using either internal or external pullup (default)
0 - Using external pulldown

Regards,
Lee

Interface

Interface forum

SN75LVCP601: Does DEW2 have internal PU/PD resistors?