JPS5622973A - Discriminating device - Google Patents
Discriminating deviceInfo
- Publication number
- JPS5622973A JPS5622973A JP9728279A JP9728279A JPS5622973A JP S5622973 A JPS5622973 A JP S5622973A JP 9728279 A JP9728279 A JP 9728279A JP 9728279 A JP9728279 A JP 9728279A JP S5622973 A JPS5622973 A JP S5622973A
- Authority
- JP
- Japan
- Prior art keywords
- socket
- control signal
- pins
- prom50
- pit25
- 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.)
- Granted
Links
Landscapes
- Testing Of Individual Semiconductor Devices (AREA)
- Read Only Memory (AREA)
- For Increasing The Reliability Of Semiconductor Memories (AREA)
Abstract
PURPOSE: To discriminate the type or the direction of the circuit device by detecting the electrical properties of several pins of the socket into which the lead of the semiconductor IC circuit device, thus preventing the breakdown of the LSI.
CONSTITUTION: Programable read only memory PROM50 is attached to socket 51 to start microcomputer MC58. MC58 opens switches S1 and S2 of input/output device PIT25 via control signal ϕ1 and then resets FF57 and 56 via control signal ϕ2. With this voltage, the voltage applied to PIT25 plus pins P19 and 21 is decided by each electrical property. The voltage applied to pins P19 and 21 is compared with the reference signal set inside discriminating circuits 53 and 54 after control signal ϕ3 is delivered from MC58, and then attached to socket 51 via MC58 to discriminate the direction of PROM50. In such way, the breakdown of the LSI due to the wrong insertion can be prevented.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9728279A JPS5622973A (en) | 1979-08-01 | 1979-08-01 | Discriminating device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9728279A JPS5622973A (en) | 1979-08-01 | 1979-08-01 | Discriminating device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5622973A true JPS5622973A (en) | 1981-03-04 |
JPH039426B2 JPH039426B2 (en) | 1991-02-08 |
Family
ID=14188148
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9728279A Granted JPS5622973A (en) | 1979-08-01 | 1979-08-01 | Discriminating device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5622973A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5244178A (en) * | 1975-10-06 | 1977-04-06 | Hitachi Ltd | Semiconductor integrated circuit device |
JPS5483381A (en) * | 1977-12-16 | 1979-07-03 | Hitachi Ltd | Detection method of integrated circuit insertion direction |
-
1979
- 1979-08-01 JP JP9728279A patent/JPS5622973A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5244178A (en) * | 1975-10-06 | 1977-04-06 | Hitachi Ltd | Semiconductor integrated circuit device |
JPS5483381A (en) * | 1977-12-16 | 1979-07-03 | Hitachi Ltd | Detection method of integrated circuit insertion direction |
Also Published As
Publication number | Publication date |
---|---|
JPH039426B2 (en) | 1991-02-08 |
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