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Soviet chips identification

  This information is obtained from various reference-books, from personal experience of a radio-electronics engineer and from senior colleagues and teachers who participated in the development (or cloning) and manufacturing of chips.
 

USSR used a single government-controlled system for markings of integrated circuits. Thanks to this fact, it's easy to find out basic information about ICs just from the chip markings. The system is applicable not only to microprocessors, FPU chips and microcontrollers, but to all types of integrated circuits. There are, however, some exceptions.

As a rule, each chip bears the following information:

 1. Part number

 2. Date
code

 3. Manufacturer
logo (optional)

 4. Rhomb
(optional)

 5. Triangle
(optional)

 6. " "
marking (optional)

 7. lot
number (optional)

 8. "" or "O" (optional)

 9. "
" or "" marking (optional)

 10. Letter "" (optional)

   

 

In greater detail:

  • 1. Part number:

    As an example, let's take the most common Soviet CPU - KP580BM80A
    It is easy to see that part numbers of Soviet chips consist of :

optional "K"  + one (or no) lette + 3 or 4 digitstwo letters + 1 or 2 digitsone ( or no) letter 
 

spec package family type model submodel
K P 580  BM  80 A             
  -submodel like "A" in i8080A
             
   Microprocessor set  model number (like "87" in i8087 )
 
           

          
      -Type:
-Computing -  Bx    
   - CPU, FPU 
   - BSP
   BE - MCU
   BB - I/O
   - timer
   B - Microprogram Controller
   - memory control
    - programmable logic array
   
   - Old marking of all
          "computing chips"
          (CPU, BSP, peripheral ect.).
         Some manufacturers used "" up to 1986/87.
         (and renamed "" to "BM", "BC"... after 86/87 )
         Others use "" till now.

-Memory - Px:
   - RAM, - ROM, - UV EPROM,  - EEPROM 

-Others: - logic gates, - generators, A - DA  - AD  converters,
   Tx - triggers, - amplifiers,  XM - PLA...  etc,
 

           

     
      -Family
 580 = i8080 family
 581 ~ LSI-11
 582,584 ~ original USSR I2L BSP family
 583 - original USSR BSP 
 585, 589 = i300x  
 586 - original USSR 16bit
 587 - original USSR 4bit BSP
 1801~ PDP-11
 1804 = Am29xx 
 1807 ~ micro VAX II
 1810 = i8086/88
 1811 = PDP-11
 1816 = 8048,8051 MCUs
 1818 = 8X300
 1831 = DEC J-11
 1821 = i80C85
 1858 = Z80
 ect.  

     CPU/FPU/BSPs families full list

     MCUs families full list
 

           

       
      -Package:
 P - Plastic (DIP or flat)
 M - Ceramic DIP
 H - Ceramic Quad Flat Pack or CLCC
 C - Glass ceramic
  - Unpackaged
  - PGA
 
 Second letter may be missing.
 Manufacturer thinks that it's easy to see is it plastic or ceramic. :)

                             
           -Spec:
 "K" means commercial spec.

 mising "K" in combination with 
 rhomb means "Mil-spec"
 



  • 2. Date code:
    Mostly YY-MM  format.
    Infrequently YY-WW format (after 1990)

  • 3. Manufacturer logo:
    There were about twenty five CPU/MCU manufacturers In the USSR. more...

  • 4. Rhomb (optional):
    Nice symbol. It means mil-spec.

  • 5. Triangle (optional):
    It's almost nothing. It means that chip is sensitive to static.

  • 6. " " marking  instead of manufacturer logo:
    "MADE IN USSR" in Russian. Used for exported (mostly to Eastern Europe) chips.

  • 7. lot number (optional)

  • 8. "" (optional) (or letter "O" befor the part number).
    Very nice marking . "ES" (Engineering Sample) in Russian. 
     
  • 9. "" or "" (optional) marking before part number or aside. 
    Extremely  nice marking!
    "" is abbreviation of  " " ( "Very Stable" )
    "" means " Very Stable Limited Edition " 
    This kind of microchip was used (and is using ) in the most important devices.
    These chips flew (and fly) to Space,  were ( are ) used in atomic weapon and nuclear power stations.

  • 10.  Letter "" before IC part number means "western package standard". For example 15681. more...
    Letter "" in the end of part nuber means the chip has imported (Western) crystal inside.

This marking system of integrated circuits is still used in former USSR countries.

Exceptions:

  • T34BM1  -  temporary name of Z80 clone(1991-1993). All known T34BM1 chips have  "" marking. It means they are all Engineering Samples. It was renamed by standardized part number 1858BM1(plastic), M1858BM1 (ceramic) later in 1993.
  • Letter "" means deviating from State Standard. For example 182185.
  • 1821 (80C85 clones) chips usually have unconventional date coding (see the table below).
  • There are chips which received wrong names, but there’s not many of them. For instance, 18291, 18292 are actually MCUs; KM1810BM89 is i8089 clone. (despite "" =CPU).
     

    Date coding:
     

 




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