Communications: electrical – Digital comparator systems
Patent
1976-01-23
1977-03-22
Fears, Terrell W.
Communications: electrical
Digital comparator systems
340173SP, G11C 1140, G11C 1700
Patent
active
040140075
ABSTRACT:
A circuit arrangement for placing information in a programmable ECL read only memory includes storage elements each comprising a circuit element and an interruptable resistance arranged between row lines and column lines. Interruption of the resistances takes place by means of an externally specified current. A row switch is provided for each row line and comprises a differential amplifier having transistors which are connected in parallel and which are controlled by address signals, and a reference transistor. The row switch also comprises an emitter follower connected to the collectors of the operating transistors and to a row line. A switch is provided whose control input is connected to the reference transistor for the purpose of row line selection and whose controlled path is arranged between a switched operating voltage source and a row line. The switched operating voltage source has a first value during a reading operation in which the row line is not influenced by the switch and has a second value during the information storing operation, which value makes possible the current necessary in order to interrupt to resistances of the storage elements.
REFERENCES:
patent: 3739355 (1973-06-01), Radcliffe, Jr.
Fears Terrell W.
Siemens Aktiengesellschaft
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