Programmable read only memory being capable of controlling inter

Details Programmable read only memory being capable of controlling inter Programmable read only memory being capable of controlling inter

1988-07-28

1991-04-30

Bowler, Alyssa H.

Static information storage and retrieval

Read/write circuit

Including signal clamping

365226, 36518909, 3072965, G11C 700, G11C 1140, G11C 1604, G11C 1606

Patent

active

050124455

ABSTRACT:
A semiconductor integrated circuit device enabled to perform both a normal writing operation using a voltage elevated with the internal supply voltage taken as the reference voltage and a writing operation with the use of another voltage elevated with an external voltage applied to an external terminal taken as the reference voltage, whereby margin measurement, high-voltage test, and accelerated test are enabled to be performed even after packaging. Further, by providing the apparatus with a mode selector having a plurality of latch circuits operating at different timing connected to an input terminal so that modes are switched by changing combination of the signals latched in such latch circuits, the number of operating modes can be increased without increasing the number of pins.

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