Cascoded PLA array

Details Cascoded PLA array Cascoded PLA array

1984-01-20

1985-05-21

Larkins, William D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307455, 307264, 357 45, 357 48, H03K 19086, H03K 19092, H03K 19177, H01L 2710

Patent

active

045188742

ABSTRACT:
A bipolar transistor integrated circuit PLA is disclosed. The array includes a first and second mutually isolated epitaxial regions in a semiconductor substrate. A plurality of common collector bipolar transistors are formed in the first epitaxial region with selected ones of the plurality having their emitters connected in common to a first current source. A second plurality of common collector bipolar transistors in the second epitaxial region have the emitters of selected ones of the second plurality connected in common to the first epitaxial region. The bases of the corresponding pairs of transistors from the first and second epitaxial region are connected to an input signal source. The second epitaxial region is connected to an output node. In this manner, a cascode connected PLA is formed which eliminates the need for surplus current sources required in the prior art. The dot OR formed by the circuit effectively merges the prior art OR array with the search array.

REFERENCES:
patent: 3539824 (1970-11-01), Yu et al.
patent: 3735358 (1973-05-01), Ho
patent: 3784976 (1974-01-01), Ho
patent: 3906212 (1975-09-01), Poguntke
patent: 3925684 (1975-12-01), Gaskill, Jr. et al.
patent: 3956641 (1976-05-01), Berger et al.
patent: 4212026 (1980-07-01), Balasubramanian et al.
Cavaliere et al, IBM Tech. Discl. Bull. vol. 18, No. 10, Mar. 1976, pp. 3245-3248.
RCA COS/MOS Digital Integrated Circuits, Data Book SSD-203 (RCA, Somerville, NJ, 1972), p. 83.

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