IBM Journal of Research and Development
IBM Skip to main content
  Home     Products & services     Support & downloads     My account  

  Select a country  
Journals Home  
  Systems Journal  
Journal of Research
and Development
    Current Issue  
    Recent Issues  
    Papers in Progress  
    Recent publications  
    Author's Guide  
  Contact Us  
  Related links:  
     IBM Research  

IBM Journal of Research and Development  
Volume 25, Number 2/3, Page 142 (1981)
VLSI Circuit Design
  Full article: arrowPDF   arrowCopyright info


A High-Density Bipolar Logic Masterslice for Small Systems

by J. Z. Chen, W. B. Chin, T.-S. Jen, J. Hutt
A new high-density bipolar logic masterslice which uses a simple Schottky Transistor Logic (STL) circuit cell as its basic building block is presented in this paper. The STL cell is derived from Integrated Injection Logic (I2L). The use of low-barrier Schottky diodes for AND logic, as diodes function in Diode Transistor Logic (DTL), makes possible achieving the NAND circuit operation. A brief description of the Schottky diode fabrication process is also given. A new concept of contact hole personalization is introduced and is shown to be an efficient approach to masterslice design as well as a factor in achieving high cell density. Due to the unusual structure of the basic cell and the arrangement of the cells in the masterslice, a new physical design methodology was developed for the design of different part numbers, corresponding to unique logic functions, on this masterslice. The STL circuit operates with a 1.7-V power supply and yields a typical delay of 3 ns at 0.5 mW and 5 ns at 0.15 mW. The I/O circuits are TTL-level compatible. The cells, the circuits, the unique features of the masterslice, and its application in an I/O controller chip are described.
Related Subjects: Integrated circuit design; LSI