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The 4-bit processors

Posted in | at 04:36

Intel 4004: first single-chip microprocessor

  • Introduced November 15, 1971
  • Clock rate 740 kHz
  • 0.07 MIPS
  • Bus Width 4 bits (multiplexed address/data due to limited pins)
  • PMOS
  • Number of Transistors 2,300 at 10 µm
  • Addressable Memory 640 bytes
  • Program Memory 4 KB (4 KB)
  • One of the earliest Commercial Microprocessors (cf. Four Phase Systems AL1, F14 CADC)
  • 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

4040

MCS-40 Family:

  • 4040-CPU
  • 4101-1024-bit (256 × 4) Static RAM with separate I/O
  • 4201-4MHz Clock Generator
  • 4207-General Purpose Byte I/O Port
  • 4209-General Purpose Byte I/O Port
  • 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

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