Here are some datasheets that I have found useful.
atmega64.pdf
PIC 16F87x.pdf - Motor
Controller project
PIC 12F629_12F675.pdf
PIC 16F628.pdf
PIC 16F84.pdf
24LC512 I2C eeprom.pdf
AD7303 dual 8 bit DAC.pdf
AD7827 single high speed ADC.pdf
ds2405 a to d converter.pdf
ds2417 RTC.pdf - RTC
module
DS2433 (4k EEPROM).pdf
ds2890 digital pot.pdf
MAX232 p.17.pdf - RS232
Level Shifter project
