Programmable read only memory output circuit

Details Programmable read only memory output circuit Programmable read only memory output circuit

1985-07-09

1987-06-09

Moffitt, James W.

Static information storage and retrieval

Read only systems

Semiconductive

365 96, 365189, 365207, 323271, 323315, 307299B, G11C 1706, G11C 700

Patent

active

046725768

ABSTRACT:
An I.sup.2 L programmable read only memory (PROM) output circuit has a selectable dual non-inverting input differential amplifier with each non-inverting input connected to a different column of memory elements. In the read mode the circuit operates at very low power levels and down to 1 volt. To program the memory elements, the circuit includes two selectable programming current sources which self extinguish as soon as the memory element being programmed changes from its unprogrammed to its programmed state. Switching between the read and program modes is accomplished merely by changing the voltage on the B+ terminal; 1-3 volts for read and 9-12 volts for program.

REFERENCES:
patent: 4101974 (1978-07-01), Immer et al.
patent: 4130889 (1978-12-01), Chua
patent: 4152627 (1979-05-01), Priel et al.
patent: 4276617 (1981-06-01), Le
patent: 4385368 (1983-05-01), Principi et al.
patent: 4432070 (1984-02-01), Moss
patent: 4441167 (1984-04-01), Principi

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