An integrated circuit (1a) for a transponder (1) , wherein said integrated circuit (1a) is switchable between a TTF (transponder talks first) and an RTF (reader talks first)-mode within a switching timeframe (TF2) , wherein the position of the switching timeframe (TF2) is shif table in relation to a timeframe (TF1) allocated to the TTF-mode . In a preferred embodiment, the switching timeframe (TF2) is before a timeframe (TF1) allocated to the TTF-mode by deiault. After initialization of the transponder (1) , the switching timeframe (TF2) is switched to a position after the timeframe.
