Contextual Info: QSFCT543T, 544T, 2543T, 2544T QS54/74FCT543T ö qss 4/ 74f c t 544t H ig h S p e e d C M O S 8 -b it B u s In te rfa c e L a t c h T r a n s c e iv e r s S I 54/ 74FCT2I 44Ì FEATURES/BENEFITS • Pin and function compatible to the 74F543/4 74FCT543/4 and 74FCT543T/4T