page_title: List of Intel microprocessors
section_title: Intel 4004
hierarchical_section_title: List of Intel microprocessors / All processors / The 4-bit processors / Intel 4004
caption_attribution_description: English: Main processor in the Intel Intellec 4 MOD 40. Note the "ES" on the C4040 indicating thati it is an engineering sample.
context_page_description: This generational list of Intel processors attempts to present all of Intel's processors from the pioneering 4-bit 4004 to the present high-end offerings. Concise technical data is given for each product.
context_section_description: First microprocessor (single-chip IC processor)
  Clock rate 740 kHz
  0.07 MIPS
  Bus width: 4 bits (multiplexed address/data due to limited pins)
  PMOS
  2,300 transistors at 10 μm
  Addressable memory 640 bytes
  Program memory 4 KB (4096 B)
  Originally designed to be used in Busicom calculator
  MCS-4 family:
  4004 – CPU
  4001 – ROM & 4-bit Port
  4002 – RAM & 4-bit Port
  4003 – 10-bit Shift Register
  4008 – Memory+I/O Interface
  4009 – Memory+I/O Interface
  Introduced November 15, 1971
  4211 – General Purpose Byte I/O Port
  4265 – Programmable General Purpose I/O Device
  4269 – Programmable Keyboard Display Device
  4289 – Standard Memory Interface for MCS-4/40
  4308 – 8192-bit (1024 × 8) ROM w/ 4-bit I/O Ports
  4316 – 16384-bit (2048 × 8) Static ROM
  4702 – 2048-bit (256 × 8) EPROM
  4801 – 5.185 MHz Clock Generator Crystal for 4004/4201A or 4040/4201A
  Introduced 1971
caption: Intel C4040
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