JPS6431239A - Semiconductor integrated circuit device - Google Patents
Semiconductor integrated circuit deviceInfo
- Publication number
- JPS6431239A JPS6431239A JP62189109A JP18910987A JPS6431239A JP S6431239 A JPS6431239 A JP S6431239A JP 62189109 A JP62189109 A JP 62189109A JP 18910987 A JP18910987 A JP 18910987A JP S6431239 A JPS6431239 A JP S6431239A
- Authority
- JP
- Japan
- Prior art keywords
- inputted
- high voltage
- pin
- passed
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Storage Device Security (AREA)
Abstract
PURPOSE:To increase general usefulness, to hold a secret and to limit a user by allowing a memory area to be programmable and equipping a code collating part to collate the contents. CONSTITUTION:When a high voltage is inputted to an address A9 pin 1, a high voltage detecting circuit 9 detects this, the nine bits of addresses A0-A8 are passed through by a signal passing control circuit 11 and a special area 16 is selected. A high voltage detecting signal from the high voltage detecting circuit 9 controls the signal passing control circuit 11 and the output data of the special area 16 are passed through and collated with a signal inputted from a comparing value input pin 5 in a code collating part 7. When the coincidence between the contents of the special area 16 and an inputted code is obtained, the passing of the output data is made possible. When a normal voltage is inputted to the A9 pin 1, the ten bits of the addresses A0-A8 and A9 are passed through in a signal passing control circuit 10, an information storing area (ROM) 17 is selected and the output of this ROM 17 sends the output data from a data output pin 4. Thus, confidentiality is guarantee.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62189109A JPS6431239A (en) | 1987-07-28 | 1987-07-28 | Semiconductor integrated circuit device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62189109A JPS6431239A (en) | 1987-07-28 | 1987-07-28 | Semiconductor integrated circuit device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6431239A true JPS6431239A (en) | 1989-02-01 |
Family
ID=16235521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62189109A Pending JPS6431239A (en) | 1987-07-28 | 1987-07-28 | Semiconductor integrated circuit device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6431239A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8918642B2 (en) | 2009-06-10 | 2014-12-23 | Cisco Technology Inc. | Protection of secret value using hardware instability |
-
1987
- 1987-07-28 JP JP62189109A patent/JPS6431239A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8918642B2 (en) | 2009-06-10 | 2014-12-23 | Cisco Technology Inc. | Protection of secret value using hardware instability |
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