Ibutton memory module dallas semiconductor ds1992l f5 the ibutton 1k memory ds1992l f5 is from a range of ibutton read write devices that act as localised databases that are easily accessible via the 1 wire protocol by minimal hardware br br suitable for use in such applications as access control debit tokens storage of calibration constants electronic travellers and workflow tracking dallas semiconductor ds1992l f5 ibutton 1k memory