Chip to convert 25 volt RS232 in PC COM to 5 volt USART?

[Elnegm]

Hi
In my project i want to interface atmega16 with my PC COM so i need the ic that convert 25 volt from the PC COM to 5 volt input to the conttroller and vica versa.
Thanks in advance

 

[bis_]

Look at the standard series of Maxim EIA-232 converters named MAX232 (there are a few derivatives with another numbers, another input/output configurations)

 

[IanP]

MAX232 is like a legend, but some designers say it is a dinosaur ..
Although you can still use it and it will work pefectly fine, nowadays you will find better solutions to convert 0-5V to RS-232 levels ..
First of all, 99% of contemporary PCs will happily accept 0-5V levels on their RX inputs ..
The 232 ICs need external capacitors, 4 of them, but there are ICs which don't use external caps any more .. MAX233, for example ..
http://www.datasheetcatalog.com/datasheets_pdf/M/A/X/2/MAX233.shtml
But wait, there is still something more interesting ..
Take a look at the low-power 8-pinners such as DS275 or DS276: 8-pins and nothing around ..
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Regards,
IanP