SN74HCS244-Q1: buffer IC layout placement

VIOLA LIAO

Prodigy 100 points

Part Number: SN74HCS244-Q1
Other Parts Discussed in Thread: SN74HCS125-Q1

Tool/software:

Hi,

Currently we using buffer to prevent the SPI signal decade which might loss the package.

But I'm not sure the buffer need to close to Tx or Rx.

and what's the buffer IC mainly functions?

thank you.

BR,

Viola

2 months ago

0 Malcolm Lyn 2 months ago

TI__Mastermind 19040 points

Hi Viola,

You should have two buffers, one should be close to TX and one should be close to RX. The buffer IC provides stronger current drive and will help preserve signal integrity over a long trace or transmission line.

Best,

Malcolm

0 VIOLA LIAO 2 months ago in reply to Malcolm Lyn

Prodigy 100 points

Hi Malcolm,

is that mean I need to put 4 buffers like below setting?
if i want to cost down the unit of buffer, what can I improve?

0 Clemens Ladisch 2 months ago in reply to VIOLA LIAO

Guru 276150 points

You can use two four-channel buffers, e.g., SN74HCS125-Q1.

0 Malcolm Lyn 2 months ago in reply to VIOLA LIAO

TI__Mastermind 19040 points

Hi Viola,

Clemens is correct, a more cost effective solution for SPI would be to use two of our 4-channel buffers.

Best,

Malcolm

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SN74HCS244-Q1: buffer IC layout placement