Semiconductor memory device having a program circuit for selecti

Details Semiconductor memory device having a program circuit for selecti Semiconductor memory device having a program circuit for selecti

1994-06-02

1996-10-08

Nelms, David C.

Static information storage and retrieval

Read only systems

Fusible

3652257, 36523002, 36523006, G11C 700

Patent

active

055638210

ABSTRACT:
This semiconductor memory device has an input circuit to which an external signal is connected, a program circuit which includes fuses capable of being cut, the program circuit determining the product type of the memory device by the combination of the cut fuses, and the operation of the input stage of the input circuit being controlled by the output of the program circuit. By simply cutting prescribed fuses after the end of the semiconductor manufacturing process, such things at outside elements become unnecessary, and the product type can be selected without an increase in the consumption current at the input circuit. Further, photomasks for each product type become unnecessary, mask management becomes simpler and management for different product types during the manufacturing process becomes unnecessary. Also, adjustments for production levels after manufacturing, adjustments for stock, and production control becomes easier.

REFERENCES:
patent: 4721868 (1988-01-01), Cornell et al.
patent: 5287311 (1994-02-01), Tso et al.

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