Column-current multiplexing driver circuit for high density prom

Details Column-current multiplexing driver circuit for high density prom Column-current multiplexing driver circuit for high density prom

1985-11-27

1988-02-02

Hecker, Stuart N.

Static information storage and retrieval

Read only systems

Fusible

365226, 365203, 365105, G11C 700, G11C 1706

Patent

active

047228229

ABSTRACT:
Current switches are used to control current into the columns during READ operations of a PROM. The circuit provides one such switch for each of the columns of the PROM and makes possible the use of a single current source which is connected to each of the switches but supplies current only to the column of the PROM that is currently selected for reading. A high voltage pre-bias is applied to the collectors of the NPN transistors used as current switches such that turn-on speed is improved because the collector parasitic capacitances are pre-charged to near the supply potential.

REFERENCES:
patent: 3582908 (1971-06-01), Koo
patent: 3611319 (1971-10-01), Hyatt
patent: 4130889 (1978-12-01), Chua
patent: 4319341 (1982-03-01), Fukushima et al.
patent: 4441167 (1984-04-01), Principi

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