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What is the difference between a N80C251SB16 and a N80C251SB16 SF87?
The N80C251SB16 is the order code for the A-1 stepping that has been EOL'd while the N80C251SB16 SF87 is the order code for the C stepping.
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When upgrading from a MCS® 51 microcontroller to a MCS 251 microcontroller, is it drop-in compatible?
Yes, it is backwards pin and code compatible. But, there are some modifications that need to be considered. Refer to Application Note 710, Migrating from the MCS 51 microcontroller to the MCS 251 microcontroller. (NOTE: This application note refers to the A stepping part.) You must configure the MCS® 251 MCU in binary and non-page mode to be compatible with the MCS 51 MCU code.
Recommended configuration bytes:
UCONFIG0 - 1101 1110B or DEH
UCONFIG1 - 1111 0111B or F7H
You may need to add wait states depending on the speed of the peripheral you are interfacing with.
When upgrading, you will not be able to use the extra address lines in your application. Once you add the extra address lines, the design becomes a MCS 251 MCU design and is no longer considered a MCS 51 MCU upgrade.
How do I identify the different steppings of the MCS® 251 Microcontroller (251Sx)?
Note: Only 251Sx has different stepping. 251Tx has only one stepping (C Stepping).
Intel stopped manufacturing the 251Sx with A Stepping in 1995. 251Sx with B Stepping never went into production. Starting at the end of 1995, Intel only manufactures the 251Sx with C Stepping.
There are a couple of ways of identifying the stepping of the MCS 251 microcontroller (251Sx).
1. On the copyright line of the product marking:
A stepping: (M) (C) 1994
C stepping: (M) (C) '94'95 C or (M) (C) '94'95
2. All extended temperature MCS 251 microcontroller parts are C-Step parts.
This information can be found in the 8XC251SX Specification Update.
We haven't heard a lot about the MCS 251 microcontroller in awhile, is Intel discontinuing the product line?
These products have been discontinued. PCN 106013 has been released with the specifics on this product discontinuance.
Does Intel offer extended temperature part for its MCS 251 microcontrollers?
Yes. Intel offers a wide range of MCS 251 microcontrollers with extended temperature. Please refer to MCS 251 MCU Line Card for complete listing of products.
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Intel® MCS® 251 Microcontrollers
