Patent ID: 7814384

Claim:
An electrical diagnostic circuit for the testing and/or the diagnostic analysis of an integrated circuit comprising: a plurality of external inputs (E n ) for receiving digital values; a plurality of essentially similar, series-connected switching units comprising: each switching unit is connected to one external input for receiving a test signal of an integrated circuit; each switching unit has an internal input for an input signal from a switching unit arranged upstream or downstream, the switching units are configured to be controllable such that an input signal present at the internal input of a switching unit, in dependence on a control signal of the switching unit, is forwarded either unchanged to the internal input of the switching unit arranged downstream or to the circuit output and/or are fed back to an internal input of a switching unit arranged upstream, or are combined with the test signal in each case present at the external input and the combination value determined from this combination is forwarded to the internal input of the switching unit in each case arranged downstream or to the circuit output and/or is fed back to the internal input of one of the switching units arranged upstream; and a circuit output for outputting an output value.