North American Philips Corporation

Signetics

Joseph T Bellavance

William J Price

An ISL clamped NPN transistor and a PNP interface transistor are merged together in a single semiconductive isolation island. The two transistors are laterally separated from each other along a semiconductive surface of the island, which also includes one or more metallic elements forming individual Schottky barrier contact diodes with the semiconductive surface. The PNP transistor provides translation between an ISL logic gate and a TTL logic gate. One of the Schottky diodes may be used in combination with the NPN transistor as an active pulldown for an output transistor of the TTL logic gate.

ISL to TTL translator

A programmable status register arrangement which enables the status of a plurality of status registers in a system to be checked simultaneously including fusible links connected to the outputs of the status registers whereby a user of the arrangement can program it to control the transmission of status signals by the plurality of status registers.

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San Jose, CA, United States of America

Joseph T Bellavance