These are datasheets mostly of the parts that I've used, or have in my parts bin, or are currently reading up on. These are the ones I find useful of interesting for myself.

analog devices

atmel

harris

  • ICL232 (RS232 level translator)

hitachi

intel

  • 8255 (I/O controller)

intersil

  • 8255 (I/O controller)

maxim

motorola

  • mocz500 (zero-crossing triac driver)

national semiconductor

phillips

samsung

seimens

  • 4N33 (opto-coupler)

sgs-thomson

  • 4017 (decoded decade counter)

texas instruments