---
title: "Pin 38:42"
url: "https://maker.wiznet.io/forum/9681"
markdown_url: "https://maker.wiznet.io/forum/9681/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "kresten"
created: "2013-11-18T12:59:00+09:00"
last_activity: "2017-05-04T08:30:28+09:00"
language: "en"
views: 470
replies: 2
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Pin 38:42

## Question

Asked by kresten on 2013-11-18 in Ethernet Chips.

Dear wiznet

I see that you updated the datasheet for W5500. Pin 38 to 42 is changed to NC. I’m doing a schematic and i have them tied to gnd with 10k resistors as in the old datasheet - should i change this?

And why did you make the change ?

Best regards

## Replies

### Reply 1 by jameskim, 2013-11-18

Hi kresten,

Those pins are tied to GND for pull-down internally and you don’t need to do pull-down on your board.
This is the reason why we’ve changed W5500 datasheet.
But, we didn’t change W5500 reference schematic which those pins are pull-downed in as you can design like that.

To make those pins pull-down or to put them NC is up to you.

Thank you.

### Reply 2 by kresten, 2013-11-19

Okay thank you - Then i do not have to change my design ![:slight_smile:](https://emoji.discourse-cdn.com/twitter/slight_smile.png?v=12)

---

Source: https://maker.wiznet.io/forum/9681