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Product FAQs
Intel® MCS® 51 Microcontrollers

What does the SF75, SF76, SF88, SF89 and SU007 mean at the end of the part number (i.e. D87C511 SF76)?
The SF76 is an Intel specification number for different packaging. For this part (D87C511), SF76 is referring to tube packaging.

More Information
Please refer to the below table for 8Bit products with different packages and packaging options.

8 Bit Quick Reference for S-Specs, Package & Packaging Options
Family Base Product Package Tube Tray Tape and Reel
MATUR 87C42 MQFP   SU007  
MCS251
MCS251
80C251TB
87C251SB
PLCC
PLCC
 
SF87
  SF12
SF12
MCS51
MCS51
MCS51
80C31BH
80C31BH
80C31BH
Cerdip / PLCC / PDIP
MQFP
PLCC
SF88


SF88


SF89
MCS51
MCS51
MCS51
80C32
80C32
80C32
PLCC / PDIP
MQFP
PLCC
SF88


SF88


SF89
MCS51
MCS51
MCS51
80C51FA
80C51FA
80C51FA
Cerdip / PLCC / PDIP
MQFP
PLCC
SF88


SF88


SF89
MCS51
MCS51
87C51
87C51
Cerdip / PLCC / PDIP
MQFP
SF76

SF76
 
MCS51
MCS51
MCS51
87C51FA
87C51FA
87C51FA
PLCC
Cerdip / PLCC / PDIP
MQFP

SF76


SF76
SF75

MCS51
MCS51
87C51FC
87C51FC
MQFP
Cerdip / PLCC / PDIP

SF76
SF76
 
MCS51 87C54 Cerdip / PLCC / PDIP / MQFP SF76    
Note:
1) 8 bit products with no S-Specs are not listed in the above table.
2) Different package types may have the same S-Spec number for different package options.


What does the 80-, 83-, and 87 mean in my part number?
The prefixes 80-, 83-, 87- in the part number indicates the type of internal memory the device has. The following descriptions define each of the prefixes.

80- ROMless device - No internal memory
83- Masked ROM - Device programmed at the factory
87- OTPROM - One Time Programmable ROM, non-erasable or UV Erasable EPROM

What does the suffix in a part number define, eg. 87C51FA24?
A suffix containing 1 or 16 or 20 or 24 or 33 indicates some kind of timing or speed change. For example, the 87C51FA24, suffix 24 denotes speed 24MHz.

1 = 3.5 to 16MHz (the 12MHz part has been consolidated with the 16MHz)
16 = 3.5 to 16MHz
20 = 3.5 to 24MHz (the 20MHz part has been consolidated with the 24MHz)
24 = 3.5 to 24MHz
33 = 3.5 to 33MHz

Product Markings: When was the dash removed in the product marking?
The dash was removed from the face of the chip on 3-Nov-95. The only difference between these two parts is the marking on the face of the chip.

For example:

Pre-conversion name - N80C52-1
Post-conversion name - N80C521

This change occurred to create consistency across all products.

How can I visually determine the stepping identification information on the MCS 51 and MCS 251 Microcontrollers?
Stepping information is contained in the lot code identifier that is in the second line marking on the topside of the chip. The second line marking is referred to as the Intel® FPO# (Finished Process Order) and is an eight digit number. The lot code identifier, Intel year, workweek of the finished product was manufactured can be viewed by referencing to the following FPO# Guide:

X X XX XXXX
Test Site Year Work week Lot Code Identifier

Example: FPO# L209555A would indicate the product was produced in 2002 in workweek 9. The stepping of the product would be "A" stepping.

What does the 'RA' stand for in the MCS® 51 N87C51RA1?
The 'Rx' designates the expanded RAM series of the MCS 51 microcontroller family. All controllers in the expanded family (RA, RB, RC) have 512 bytes of RAM.

Refer to the 8XC51RA/RB/RC CHMOS Single-Chip 8-Bit Microcontrollers datasheet for more information on ROM capacity and other peripheral functionality.

Where can I find the datasheets for the 80C32?
The 8XC52/54/58 CHMOS Single-Chip 8-Bit Microcontroller datasheet can be found on the web.

This is the correct datasheet. The 80C32 is the ROMless version of the 87C52. Looking under the title on the first page of the datasheet also specifically states it is for the 80C32.

We haven't heard a lot about the MCS 51 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® 51 microcontrollers?
Yes. Intel offers a wide range of MCS 51 microcontrollers with extended temperature. Please refer to MCS 51 MCU line card for complete listing of products.

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