Intel 80386
Intel A80386DX-16 ΣΣ
Developer	Intel
Manufacturer	Intel
Type	Microprocessors
Introduction	June 1984 (announced) October 1985 (launch)
Production	1985-2008
Architecture	x86
ISA	IA-32
µarch	80386
Word size	32 bit 4 octets 8 nibbles
Process	1.5 µm 1,500 nm 0.0015 mm , 1 µm 1,000 nm 0.001 mm
Technology	CMOS
Clock	12 MHz-33 MHz
Package	PGA-132, PQFP-132
Succession
←	→
80286	80486

The 80386, also i386 and 386, (pronounced eighty-three-eighty-six) was a family of 32-bit 3rd-generation x86 microprocessors introduced by Intel in 1985 as a successor to 80286. These processors provided were fully backwards compatible with previous generations of x86 processors but introduced a number of major new features including enhancements to protected mode and virtual 8086 mode. The changes brought about by 386 became the standard for all future 32-bit x86 processors, dubbed i386-architecture.

History

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Architecture

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Members

Single-word eXternal

Model	Introduction	Ext. Bus	Frequency	Notes
80386SX-16	June 16, 1988	16-bit	16 MHz
80386SX-20	January 25, 1989	16-bit	20 MHz
80386SX-25	January 25, 1989	16-bit	25 MHz
80386SX-33	October 26, 1992	16-bit	33 MHz
80386SL-20	October 15, 1990	16-bit	20 MHz
80386SL-25	September 30, 1991	16-bit	25 MHz

Double-word eXternal

Model	Introduction	Ext. Bus	Frequency	Notes
80386-12	October 17, 1985	32-bit	12 MHz	Renamed with "DX" suffix upon the introduction of the "SX" version.
80386-16	December, 1985	32-bit	16 MHz
80386-20	February 16, 1987	32-bit	20 MHz
80386DX-16	1988	32-bit	16 MHz
80386DX-20	1988	32-bit	20 MHz
80386DX-25	April 4, 1988	32-bit	25 MHz
80386DX-33	April 10, 1989	32-bit	33 MHz
80386DX-16 IV		32-bit	16 MHz
80386DX-20 IV		32-bit	20 MHz
80386DX-25 IV		32-bit	25 MHz
80386DX-33 IV		32-bit	33 MHz

Support Chips

Part	Description
A82370-16	32-bit 8-channel DMA controller @ 16 MB/sec
82380-16	32-bit DMA controller with Programmable Interrupt Controller (PIC) @ 16 MHz
82380-20	32-bit DMA controller with Programmable Interrupt Controller (PIC) @ 20 MHz
82380-25	32-bit DMA controller with Programmable Interrupt Controller (PIC) @ 25 MHz
82384-16	Clock generator @ 16 MHz
82384-20	Clock generator @ 20 MHz
82385	Cache Controller

Clones

• Am386

This list is incomplete; you can help by expanding it.

Documents

Manual

• 386 DX MICROPROCESS OR PROGRAMMER'S REFERENCE MANUAL (1990)
• 386 SX MICROPROCESS OR PROGRAMMER'S REFERENCE MANUAL (1989)
• 80386 HARDWARE REFERENCE MANUAL (1986)

Others

• Introduction to the 80386 including the 80386 Data Sheet (April, 1986)