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Shared I/O Couplings for MTL Cells

IP.com Disclosure Number: IPCOM000061246D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Wong, RC: AUTHOR

Abstract

This article describes a means for increasing the density and improving the stability of a Split Emitter Merged Transistor Logic (SEMTL) cell as applied to a SEMTL array configuration. Fig. 1 illustrates a SEMTL array in which a group of multi-device cells share sub-diffusion and booster resistors for improved density. The booster resistors are employed to enhance the sense signals. As outlined in this disclosure, the read/write control circuits shown in Fig. 1 may also be shared among the cells of the group, as indicated by Fig. 2, which shows shared couplings for the MTL cells. The following advantages proceed from the arrangement shown in Fig. 2: 1) Higher density. * The number of read/write (R/W) control circuits is reduced by m times. * Very little or no multiplexing is necessary.

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Shared I/O Couplings for MTL Cells

This article describes a means for increasing the density and improving the stability of a Split Emitter Merged Transistor Logic (SEMTL) cell as applied to a SEMTL array configuration. Fig. 1 illustrates a SEMTL array in which a group of multi-device cells share sub-diffusion and booster resistors for improved density. The booster resistors are employed to enhance the sense signals. As outlined in this disclosure, the read/write control circuits shown in Fig. 1 may also be shared among the cells of the group, as indicated by Fig. 2, which shows shared couplings for the MTL cells. The following advantages proceed from the arrangement shown in Fig. 2: 1) Higher density. * The number of read/write (R/W) control circuits is reduced by m times. * Very little or no multiplexing is necessary. * Only one bit line (BL) per cell is required for selection/ deselection purposes. * Injectors have a common emitter, and cell size is reduced. * More word lines (WL) can be arranged in the array because back injections no longer cause bit line offsets. 2) Improved DC stability of operation results through the commoning of the injector bit lines. 3) Performance is enhanced by minimizing multiplexing in the read/write path. In summary, in the MTL cell arrangement disclosed, I/O couplings of the cell, as well as sub-diffusions and booster resistors, are shared among many cells. This results in a smaller cell layout, simpler support circuits, and imp...