PROGRAMMABLE LOGIC DEVICE

A semiconductor integrated circuit capable of electrically writing functions according to this invention comprises a plurality of logical blocks capable of electrically writing functions and wire elements capable of programmably connecting the logical blocks to each other. Each of the logical blocks includes a gate element as an output buffer having a control terminal. The gate element assumes a high impedance state when inputting a control signal to the control terminal. An output of the logical block is thereby made unable; or the respective logical blocks are directly wired-connectable to effect logical sum outputting. Alternatively, the gate element assumes two output states of an open drain output and a totem-pole output. Hence, in the semiconductor integrated circuit of this invention, it is possible to improve a gate using efficiency of the small-sized programmable logical blocks and attain a high-density and high-integrated programmable logic device.