JPS5766593A - Prom protection circuit for erroneous insertion of prom vriter - Google Patents
Prom protection circuit for erroneous insertion of prom vriterInfo
- Publication number
- JPS5766593A JPS5766593A JP14277180A JP14277180A JPS5766593A JP S5766593 A JPS5766593 A JP S5766593A JP 14277180 A JP14277180 A JP 14277180A JP 14277180 A JP14277180 A JP 14277180A JP S5766593 A JPS5766593 A JP S5766593A
- Authority
- JP
- Japan
- Prior art keywords
- prom
- prom1
- voltage
- socket
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
- G11C17/14—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards in which contents are determined by selectively establishing, breaking or modifying connecting links by permanently altering the state of coupling elements, e.g. PROM
Landscapes
- Techniques For Improving Reliability Of Storages (AREA)
- Read Only Memory (AREA)
Abstract
PURPOSE:To prevent destruction when a PROM writer is inserted reversely, by providing a circuit which detects whether a PROM is inserted into an IC socket normally or not and by varying an applied voltage on the basis of its detection output. CONSTITUTION:When a PROM1 is inserted reversely into an IC socket, a voltage VINis applied to the PROM1 and a current flows through a resistance R4. The current flowing through the resistance R4 becomes greater than that when it is inserted into the socket normally, so the plus terminal of a comparator 6 has a lower level than that of the minus terminal, and the output of the comparator 6 goes down to a low level, so that an LED gives a warning by turning on. For the writing to or reading from the PROM1, a voltage application signal 10 is held at a high level only when an overcurrent detection signal 8 is at a high level. This signal is inverted by an inverter 9 to turn off a Q1, and an operating voltage Vout selected through resistances R1-R2 is applied to the power terminal of the PROM1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14277180A JPS5766593A (en) | 1980-10-13 | 1980-10-13 | Prom protection circuit for erroneous insertion of prom vriter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14277180A JPS5766593A (en) | 1980-10-13 | 1980-10-13 | Prom protection circuit for erroneous insertion of prom vriter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5766593A true JPS5766593A (en) | 1982-04-22 |
Family
ID=15323199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14277180A Pending JPS5766593A (en) | 1980-10-13 | 1980-10-13 | Prom protection circuit for erroneous insertion of prom vriter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5766593A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6013399A (en) * | 1983-07-04 | 1985-01-23 | Fanuc Ltd | Operating method of power supply for rom |
| JPS6439693A (en) * | 1987-08-04 | 1989-02-09 | Mitsubishi Electric Corp | Rom writer device |
| JPS6482391A (en) * | 1987-09-24 | 1989-03-28 | Fanuc Ltd | Prom writing device |
| JPH01264695A (en) * | 1989-02-09 | 1989-10-20 | Toshiba Corp | Prom protecting circuit by misinsertion of prom writer |
-
1980
- 1980-10-13 JP JP14277180A patent/JPS5766593A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6013399A (en) * | 1983-07-04 | 1985-01-23 | Fanuc Ltd | Operating method of power supply for rom |
| JPS6439693A (en) * | 1987-08-04 | 1989-02-09 | Mitsubishi Electric Corp | Rom writer device |
| JPS6482391A (en) * | 1987-09-24 | 1989-03-28 | Fanuc Ltd | Prom writing device |
| JPH01264695A (en) * | 1989-02-09 | 1989-10-20 | Toshiba Corp | Prom protecting circuit by misinsertion of prom writer |
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