The 4-bit processors

Intel 4004: first single-chip microprocessor

• Introduced November 15, 1971
• Clock speed 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 Registr
• 4008-Memory+I/O Interface
• 4009-Memory+I/O Interface

4040

MCS-40 Family:

• 4040-CPU
• 4101-1024-bit (256 x 4) Static RAM w/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 x 8) ROM w/ 4-bit I/O Ports
• 4316-16384-bit (2048 x 8) Static ROM
• 4702-2048-bit (256 x 8) EPROM
• 4801-5.185 MHz Clock Generator Crystal for 4004/4201A or 4040/4201A