DS25BR440: termination of unused pin

ryuji asano

Part Number: DS25BR440

Hi, Expart.

How should we perform terminal processing of unused pin?
I would like to kwow about the following pins.

・IN (PIN#：1,2,4,5,6,7,9,10)
・OUT (PIN#：29,28,27,26,24,23,22,21)
・EQ (PIN#：40,39,11,12)
・PE (PIN#：31,20,19,18)
・PWDN (PIN#：35,20,19,18)
・LOS (PIN#：14,37,36,13)
・PWDN (PIN#：38)
・VDD (PIN#：3,8,15,25,30)

I'm sorry to ask you a lot.
My customer is asking me about that. I don't know what to do.
Please help me.

Best regards.

Ryuji

over 8 years ago

0 Lee Sledjeski over 8 years ago

TI__Mastermind 43795 points

Hi Ryuji,

It is unlikely all the pins will be unused. Here are recommendations for the DS25BR440.

VDD - Use all the pins. Do not leave any of these pins unconnected. Local decoupling is also recommended.

PWDN (38) - Generally this pin is tied to VDD if static or driven from programmable logic to a 1/0 level if control is needed.

PWDNn (18, 19, 20, 35) - Usually pulled to VDD with weak pull-up resistors.

LOSn (13, 14, 36, 37) - Often tied to the associated PWDNn inputs.

OUT - leave unconnected if not used.

EQ - pull to 1/0. Do not leave unconnected.

PE - pull to 1/0. Do not leave unconnected.

INn - leave unconnected and ensure LOSn tied to PWDNn

Regards,

Lee

0 ryuji asano over 8 years ago in reply to Lee Sledjeski

Intellectual 800 points

Hi Lee-san,

Thank you very much for your kind answers!

Ryuji

0 ryuji asano over 8 years ago in reply to Lee Sledjeski

Intellectual 800 points

Hi Lee-san,

Sorry.
I have a question again.

>PWDN (38) - Generally this pin is tied to VDD if static or driven from programmable logic to a 1/0 level if control is needed.

If 1/0 logic control is not needed, PIN#38 is tied to VDD.
OK? No problem?

Best Regards,
Ryuji

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DS25BR440: termination of unused pin