SEMICONDUCTOR INTEGRATED CIRCUIT

摘要

1485249 Integrated logic circuits INTERNATIONAL BUSINESS MACHINES CORP 6 May 1976 [23 June 1975] 18557/76 Heading H1K An integrated logic circuit includes, in a common semi-conductor substrate 10 (Fig. 1), two preferably interspersed groups of elongate logic units 14, 16 in columnar arrays, the units 16 of one group being longer than those 14, of the other group, there being also two groups of conductive tracks (not shown in Fig. 1) over the substrate 10 aligned transversely to the long axes of the logic units 14, 16 and connected to selected input signal terminals thereof respectively. Each unit 14, 16 also has reference potential terminal, an output signal terminal and input signal regions of which only some are selected by provision of terminals for contact to the above-mentioned conductive tracks. Figs. 4 and 4A show long logic units 16 composed of TTL NAND gates each including a first transistor having forty-two emitter regions 19 of which in each unit only four are selected and contacted by lead-throughs from parallel metal tracks 22 (CH1-CH42). Each unit 16 also includes diffused or implanted resistors R1-R3 and a single-emitter output transistor. The shorter units 14 are similar, but have only thirteen emitters in the input transistors. The various transistors may have their bases clamped to collectors by Schottky diodes DTL and MTL logic units may also be employed, and particular logic applications include polarity-hold shift register latches (SRLs), set-reset SRLs and SRL clock drives. A complete level-sensitive logic network employing such elements is briefly described.