Semiconductor integrated circuit for electronic watch - with substrate having zone controlling displayed characters and zone as logic stage (NL010377)

摘要

The semiconductor integrated circuit, for an electronic watch, includes several segmental l.e.d.'s., acting as display elements for the respective characters of the digital time display. The semiconductor substrae has a zone (Q1, Q2) acting as the control stage for the displayed characters and/or the display segments and a second zone (T1-T4) acting as a logic stage supplying the output signals to the display field. The first zone (Q1, Q2) includes a vertical bipolar transistor (Q2) with the substrate acting as the collector, a doping region of opposite type acting as the base and a further semiconductor zone of similar type to he substrate acting as the emitter. The second zone (T1-T4) includes a transistor (T4, T2) with one of two semiconductor regions of opposite type to the substrate acting as the source electrode, the other region acting as the drain electrode.