- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
for MAX II EPM1270
For the weak pull-up resistor during power up,IO will show a high voltage(3.3V).I want to make IO show a low voltage by adding a pull-down resistor.what is the appropriate resistor value for it? 5000ohm will be ok? Thank you. 上电时由于weak pull-up resistor ,IO输出很短的高电平。若通过加下拉电阻拉使之一直保持低,那需加多大的下拉电阻?Link Copied
1 Reply
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Please do not multipost your question.
The datasheet should give you the lowest possible value for the weak pull-up in the Max II. When you add a pull down you create a resistor divider, and depending on the voltage you want to reach (<0.8V for a TTL signal, as an example) it will give you the highest possible value for the pull down.
Reply
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page