LMH0387 Short-circuited 48pin and 47pin

masahiko shimizu

Other Parts Discussed in Thread: LMH0387

My customer is using LMH0387.
They short-circuited 48pin and 47pin on the system board.

48pin and 47pin is reserved pin.
TI recommends to make those pins open.

Does a problem occur by the short circuit of 48pin and 47pin?

Best regards,
Shimizu

over 9 years ago

0 Michael Peffers over 9 years ago

TI__Mastermind 20820 points

Hi Shimizu,

The data sheet specifies that these pins are a do not connect and I recommend that your customer follows what the data sheet specifies for the devices. I will check though to see what the danger is in shorting these pins together.

Regards,

Michael Peffers

High Speed Interface Applications

0 T.K. Chin over 9 years ago in reply to Michael Peffers

TI__Expert 3175 points

Hi Shimizu,

Pins 47, 48 are recommended "Do not connect" in our datasheet.

If you have not start board layout, you should keep these pins unconnected.

Can you clarify if your customer already have these 2 pins shorted?

Regards,

TK Chin

0 masahiko shimizu over 9 years ago in reply to Michael Peffers

Guru 11235 points

Hi Michael

Thank you for your support.

I wait a result of your check.

Best regards,

Shimizu

0 masahiko shimizu over 9 years ago in reply to T.K. Chin

Guru 11235 points

Hi Chin

Thank you for your support.

My customer had already finished layout.

Short means the bridge of 48pin and 47pin on mass production board.

If short is problem, my customer must rework their product.

Best regards,

Shimizu

0 T.K. Chin over 9 years ago in reply to masahiko shimizu

TI__Expert 3175 points

Shimizu,

Let me check the bond diagram of this part and will advise if there is any issue in shorting pins 47 to 48.

Regards,

TK Chin

0 Nasser Mohammadi over 9 years ago in reply to T.K. Chin

TI__Guru* 88765 points

Shimizu-San,

Based on discussions with TK, i checked the bonding diagram. It should be ok to connect or short circuit pins 47 and 48.

Regards,,nasser

0 masahiko shimizu over 9 years ago in reply to Nasser Mohammadi

Guru 11235 points

Hi Nasser

Thank you for your information.

I will tell my customer this good information.

Best regards,

Shimizu

Interface

Interface forum

LMH0387 Short-circuited 48pin and 47pin