View source for Embedded Chips and IO

==RTC Chips and Modules==
* [http://www.maxim-ic.com/products/rtc/ Maxim IC RTC Chips]
** Large variety of I2C and SPI-based RTC chips
** Many have Arduino Libraries
**[http://www.ladyada.net/learn/breakoutplus/ds1307rtc.html DS-1307 RTC Tutorial (Arduino)]
==I/O Expander Chips==
These chips add additional input/output pins to an existing micro-controller
*[Microchip GPIO Expanders]
**[http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en025898 MCP23x17 16-GPIO i2C Chip]
**[http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1244603940 MCP23017 Sample Code (Arduino)
**[http://blog.littlebirdelectronics.com/arduino-i2c-mcp-23017-lcd-interface MCP-23017 LCD Tutorial (Arduino)]
==EEPROM memory chips==
*[http://www.atmel.com/products/memories/serial/i2c.aspx Atmel AT24C eeprom (i2c)
*[http://www.contesti.eu/opensource/bank/at24c-arduino-library-zip-file-for-download/view?set_language=en Library for AT24C (Arduiino)]