Intel 4040

Intel 4040

The ceramic C4040 variant.
Produced	From 1974 to 1981[1]
Common manufacturer(s)	Intel
Max. CPU clock rate	500 kHz to 740 kHz
Min. feature size	10μm
Instruction set	4-bit BCD oriented
Predecessor	Intel 4004 Intel 8008
Successor	Intel 8080
Package(s)	24 pin DIP

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^[2] and could execute approximately 60,000 instructions per second.

The ceramic D4040 variant.

The plastic P4040 variant.

New features

i4040 microarchitecture.

• 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