Static information storage and retrieval – Read only systems
Patent
1980-04-21
1982-03-09
Hecker, Stuart N.
Static information storage and retrieval
Read only systems
365 96, G11C 700, G11C 1700
Patent
active
043193412
ABSTRACT:
A program circuit for permanently storing data into a programmable read only memory. A programming current (received from an external source) is connected to the selected bit line through a Darlington pair which is controlled by the bit decoding circuitry. Thus, the bit decoding circuitry is not required to pass the large programming current, and the programming current is not significantly shunted away from the selected bit line. To facilitate use of the Darlington configuration, a constant current source is provided for each bit line within a set of bit lines. The program circuit includes at least one switching means for connecting the program current to a selected bit line, a bit decoder connected to the control inputs of the switching means for selecting a bit line in response to the addressing signals input to the bit decoder and a control current supplying means for supplying a control current to the control inputs of the switching means.
REFERENCES:
patent: 3611319 (1971-10-01), Hyatt
patent: 4101974 (1978-07-01), Immer et al.
patent: 4130889 (1978-12-01), Chua
Radcliffe, "Fusable Diode Array Circuits", IBM Tech. Disc. Bul., vol. 21, No. 1, Jun. 1978, pp. 105-108.
Fukushima Toshitaka
Kawabata Yuichi
Koyama Kazumi
Miyamura Tamio
Ueno Kouji
Fujitsu Limited
Hecker Stuart N.
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