Intel 4040

Updated on Nov 15, 2023

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Produced From 1974 to 1981 Max. CPU clock rate 500 kHz to 740 kHz Instruction set 4-bit BCD oriented		Common manufacturer(s) Intel Min. feature size 10μm Predecessor Intel 4004 Intel 8008

The Intel 4040 microprocessor was the successor to the Intel 4004. It was introduced in 1974. The 4040 employed a 10 μm silicon gate enhancement load PMOS technology, was made up of 3,000 transistors and could execute approximately 60,000 instructions per second.

New features

Interrupt

Single Step

Extensions

Instruction Set expanded to 60 instructions

Program memory expanded to 8 KB (13-bit address space)

Registers expanded to 24

Subroutine stack expanded to 7 levels deep

Data Bus: 4-bit
Address Bus: 12-bit
Voltage: +15V

Designers

Federico Faggin proposed the project, formulated the architecture and led the design. The detailed design was done by Tom Innes (Tinnes of Bristol).

New support chips

4201 – Clock Generator 500 to 740 kHz using 4 to 5.185 MHz crystals

4308 – 1 KB ROM

4207 – General Purpose byte Output port

4209 – General Purpose byte Input port

4211 – General Purpose byte I/O port

4289 – Standard Memory Interface (replaces 4008/4009)

4702 – 256 byte UVEPROM

4316 – 2 KB ROM

4101 – 256 4-bit word RAM

Production

Philippines

References

Intel 4040 Wikipedia

(Text) CC BY-SA