The mechanical characteristics of the RAM SO-DIMM are given in JEDEC specification number JEDEC MO-190-C. The specification is available from the Electronics Industry Association's website at
http://www.jedec.org/download/pub95/
The electrical characteristics of the RAM SO-DIMM are given in section 4.5.6 of the JEDEC Standard 21-C, release 7. These specifications are available from the Electronics Industry Association's web site at
http://www.jedec.org/download/pub21/