Current switch for programming vertical fuses of a read only mem

Details Current switch for programming vertical fuses of a read only mem Current switch for programming vertical fuses of a read only mem

1986-04-07

1987-12-29

Fears, Terrell W.

Static information storage and retrieval

Read only systems

Fusible

365189, 307530, G11C 1140

Patent

active

047165472

ABSTRACT:
A ROM having an on-chip current switch is provided that removes the programming voltage from the vertical fuse of the ROM when the fuse is programmed, thereby preventing excessive current from flowing therethrough. A programming current switch is coupled between an output terminal and a row decode for switchable transmitting a programming voltage from the output terminal to the row decode, a word line and a fuse, wherein the programming voltage will program the fuse causing the voltage thereacross to change. A program sense amplifier is coupled between the row decode and the programming current switch for switching the programming current switch off when the voltage change has been sensed.

REFERENCES:
patent: 4646264 (1987-02-01), Matsuzaki

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