| 制造商 | 部件名 | 数据表 | 功能描述 |
 National Semiconductor ... | PAL20R4-7JC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-7JM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-7NC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-7NM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-7VC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-7VM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
 National Semiconductor ... | PAL20R4-4JC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-4JM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-4NC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-4NM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-4VC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-4VM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-5JC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-5JM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-5NC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-5NM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-5VC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-5VM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-7JC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R4-7JM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |