NEC
Type	Public
Founded	July 17, 1899 Tokyo, Japan
Headquarters	Tokyo, Japan
Website	https://www.nec.com/

NEC Corporation Japanese multinational semiconductor and electronics company.

Microprocessors

• SX (vector processors)

• SX-Aurora (microarch)

Families

• Vector Engine

• Type 10A

• Type 10AE

• Type 10B

• Type 10BE

• Type 10C

• Type 10CE

Microcontrollers

• μPD707/μPD708 (1971)
• μPD751 (1973)

• μCOM-4 extended family

• μCOM-4 ISA

• μCOM-42 family

• μPD548

• μPD555

• μCOM-43 family

• μPD546

• μPD553

• μPD556(B)

• μPD557L

• μPD650

• μCOM-44 family

• μPD547

• μPD547L

• μPD552

• μPD651

• μCOM-45 family

• μPD550

• μPD550L

• μPD554

• μPD554L

• μPD652

• μCOM-46 family

Tables

NEC Microcontrollers
Model	Family	Introduction	ROM	RAM	Pins
μPD546	μCOM-43	1977	2000x10 bit	96x4 bit	42
μPD547	μCOM-44	1977	1000x10 bit	64x4 bit	42
μPD547L	μCOM-44L	1978	1000x10 bit	64x4 bit	42
μPD548	μCOM-42	1977	1920x10 bit	96x4 bit	42
μPD550	μCOM-45	1977	640x8 bit	32x4 bit	28
μPD550L	μCOM-45L	1980	640x8 bit	32x4 bit	28
μPD552	μCOM-44H	1978	1000x10 bit	64x4 bit	42
μPD553	μCOM-43H	1978	2000x8 bit	96x4 bit	42
μPD554	μCOM-45	1978	1000x8 bit	32x4 bit	28
μPD554L	μCOM-45L	1981	1000x8 bit	32x4 bit	28
μPD555	μCOM-42 EVACHIP	1977		96x4 bit	64
μPD556 μPD556B	EVACHIP-43	1977		96x4 bit	64
μPD557L	μCOM-43SL	1981	2000x8 bit	96x4 bit	28
μPD650	μCOM-43C	1978	2000x10 bit	96x4 bit	42
μPD651	μCOM-44C	1978	1000x10 bit	64x4 bit	42
μPD652	μCOM-45C	1978	1000x8 bit	32x4 bit	42

Calculators Chipsets

• NEC IC

• µPD261 (1972) • 8-Segment Decoder (DIP20)

(with Serial input and VF-Display driver outputs)

• µPD262 (1973) • 12 digit, Timing Controller (DIP20)
• µPD264 (1973) • 12 digit, External Memory Register (DIP20)

• µPD271 (1972) • 8 digits, 10 µm PMOS (DIP28)
• µPD272 (1973) • Low-voltage version of µPD271 (DIP28)
• µPD273 (1973) • 8 digits, single-chip (DIP28)
• µPD274 (1974) • 8 digits, single-chip (DIP28)
• µPD275 (1974) • 8 digits, single-chip (DIP28)
• µPD276 (1974) • 8 digits, single-chip (DIP28)
• µPD277 (1973) • 8 digits, single-chip (DIP28)
• µPD278 (1975) • 8 digits, single-chip, Enhanced (DIP28)

• µPD280 (1973) • Program ROM (DIP24)
• µPD281 (1973) • 12 digit, Program ROM (DIP24)
• µPD282 (1973) • 12 digit, Arithmetic Logic Unit, Data Registers (DIP28)
• µPD283 (1973) • 12 digit, Program ROM (DIP24)

• µPD940 (1974) • 8 digits, single-chip (DIP28)
• µPD941 (1974) • 8 digits, single-chip (DIP28)
• µPD942 (1974) • 8 digits, single-chip (DIP28)
• µPD943 (1974) • 8 digits, single-chip (DIP28)
• µPD946 (1975) • 8 digits, single-chip, Enhanced (DIP28)
• µPD947 (1975) • 8 digits, single-chip, Enhanced (DIP28)

Part Numbering System

NEC introduced already with their first Integrated Circuits (ICs) a well-organized numbering scheme for their products.

The leading µ is a registered trademark used with ICs and the following two letters define the Family Type:

• µPA - Array Element
• µPB - Bipolar, Digital IC
• µPC - Bipolar, Linear IC
• µPD - MOS Digital IC

The Family Type is followed by the Product Number, in many cases a sequential number:

• nnn - Product Identification Number. Usually numerals, but may include letters

Additional fields are reserved for Revision (one character, starting with A) and Functional Classification (one character).

The next field is used for the Package Type (one or two characters):

• A - Metal Can or Metallic
• B - Ceramic
• C - Plastic DIP
• D - Ceramic DIP
• Fx - BGA, LGAM
• Gx - QFP, SOP, TSOP, SSOP
• Hx - SIP
• Mx - Part of SSOP
• Nx - BGA
• Sx - BGA, PGA

Additional fields are used for Quality Grade, Custom Codes, Speed Classification, etc.

Note: Some products may have characters such as /JM suffixed to their part numbers. These characters indicate where the product was manufactured.

The first character after the slash indicates the country where the manufacturer of the IC diffusion processing is located, and the second character

indicates the country where the product was assembled. In the case of /JM, the J stands for Japan, and the M for Malaysia.

A typical single-chip calculator circuit from NEC manufactured in 1975 might read NEC µPD940C H5728M:

• MOS Digital IC, 940, Plastic DIP
• H5728M is a production lot/date code, we assume that 5 represents the year 1975 and 7 the month July

Note: 1 January, …, 9 September, X October, Y November and Z December

LSI/MOS Process Timeline

• 1971 - 10 µm metal gate PMOS, enhancement mode transistors for gates and loads
• 1974 - 7.5 µm metal gate PMOS, enhancement mode transistors for gates and loads
• 1975 - 7.5 µm metal gate PMOS, enhancement mode transistors for gates, depletion mode transistors for loads
• 1976 - 5 µm metal gate PMOS, enhancement mode transistors for gates, depletion mode transistors for loads
• 1974 - 7.5 µm silicon gate NMOS, enhancement mode transistors for gates and loads
• 1975 - 7.5 µm silicon gate NMOS, enhancement mode transistors for gates, depletion mode transistors for loads
• 1975 - 5 µm silicon gate NMOS, enhancement mode transistors for gates, depletion mode transistors for loads
• 1978 - 4 µm silicon gate NMOS, enhancement mode transistors for gates, depletion mode transistors for loads
• 1975 - 7.5 µm metal gate CMOS
• 1976 - 5 µm silicon gate CMOS
• 1978 - 4 µm silicon gate CMOS
• 1980 - 3 µm silicon gate CMOS