Am486 - AMD

AMD Am486

Am486DX2-66
Developer	AMD
Manufacturer	AMD
Type	Microprocessors
Introduction	February, 1992 (announced) April 1993 (launch)
Production	1992
Architecture	80486
ISA	IA-32
Word size	32 bit 4 octets 8 nibbles
Process	700 nm 0.7 μm 7.0e-4 mm , 500 nm 0.5 μm 5.0e-4 mm , 440 nm 0.44 μm 4.4e-4 mm , 350 nm 0.35 μm 3.5e-4 mm
Technology	CMOS
Clock	33 Mhz-120 MHz
Package	PGA-168, QFP-208
Socket	Socket 1, Socket 2, Socket 3
Succession
←	→
Am386	Am5x86

Am486 was a family of 32-bit 4th-generation x86 microprocessors introduced by AMD in 1993. Am486 chips were compatible with Intel's 80486, but offered very equivalent performance for cheaper prices.

History

Just like AMD's Am386, Am486 was also delayed after expensive and lengthy litigation with Intel. The first models of the Am486 (Am486DX) were finally introduced in April of 1993. AMD manufactured their first Am486s at their Submicron Development Center (SDC) in Sunnyvale, CA on a 0.7 µm process. By the end of 1993 AMD revenue of the Am486 reached $250M taking a total of 20% share of the market^[1]. By 1995 that share peaked at 40%.

AMD's last models (Am486DX4's) for this family were clocked at up to 120 MHz which gave AMD a significant performance advantage compared to Intel's earliest Pentium chips (which were only clocked at around 60 MHz). The Am486DX4 lower price (compared to Intel's DX4) and socket-comparability ensured strong sale for quite some time after their introduction.

Members

Am486DX

Am486DX Processors
Model	Launched	Process	Freq	Bus	Max Mem
Am486DX-25	April 1993	700 nm 0.7 μm 7.0e-4 mm	25 MHz 0.025 GHz 25,000 kHz	25 MHz 0.025 GHz 25,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX-33	April 1993	700 nm 0.7 μm 7.0e-4 mm	33 MHz 0.033 GHz 33,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX-40	April 1993	700 nm 0.7 μm 7.0e-4 mm	40 MHz 0.04 GHz 40,000 kHz	40 MHz 0.04 GHz 40,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-100	September 1994	500 nm 0.5 μm 5.0e-4 mm	100 MHz 0.1 GHz 100,000 kHz	50 MHz 0.05 GHz 50,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-100V16B	1995	350 nm 0.35 μm 3.5e-4 mm	100 MHz 0.1 GHz 100,000 kHz	50 MHz 0.05 GHz 50,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-100V8B	1994	500 nm 0.5 μm 5.0e-4 mm	100 MHz 0.1 GHz 100,000 kHz	50 MHz 0.05 GHz 50,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-100V8T	1994	500 nm 0.5 μm 5.0e-4 mm	100 MHz 0.1 GHz 100,000 kHz	50 MHz 0.05 GHz 50,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-50	June 1993	700 nm 0.7 μm 7.0e-4 mm 500 nm 0.5 μm 5.0e-4 mm	50 MHz 0.05 GHz 50,000 kHz	25 MHz 0.025 GHz 25,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-66	June 1993	700 nm 0.7 μm 7.0e-4 mm 500 nm 0.5 μm 5.0e-4 mm	66 MHz 0.066 GHz 66,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-66NV8T	August 1995	500 nm 0.5 μm 5.0e-4 mm	66 MHz 0.066 GHz 66,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-66V16B	March 1997	350 nm 0.35 μm 3.5e-4 mm	66 MHz 0.066 GHz 66,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-66V8B	1994	500 nm 0.5 μm 5.0e-4 mm	66 MHz 0.066 GHz 66,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-66V8T	1994	500 nm 0.5 μm 5.0e-4 mm	66 MHz 0.066 GHz 66,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-80	September 1994	500 nm 0.5 μm 5.0e-4 mm	80 MHz 0.08 GHz 80,000 kHz	40 MHz 0.04 GHz 40,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-80NV8T	August 1995	500 nm 0.5 μm 5.0e-4 mm	80 MHz 0.08 GHz 80,000 kHz	40 MHz 0.04 GHz 40,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX2-80V8T	1994	500 nm 0.5 μm 5.0e-4 mm	80 MHz 0.08 GHz 80,000 kHz	40 MHz 0.04 GHz 40,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX4-100	September 1994	500 nm 0.5 μm 5.0e-4 mm	100 MHz 0.1 GHz 100,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX4-100NV8T	1995	500 nm 0.5 μm 5.0e-4 mm	100 MHz 0.1 GHz 100,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX4-100V16B	March 1997	350 nm 0.35 μm 3.5e-4 mm	100 MHz 0.1 GHz 100,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX4-100V8T	1994	500 nm 0.5 μm 5.0e-4 mm	100 MHz 0.1 GHz 100,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX4-120	5 June 1995	500 nm 0.5 μm 5.0e-4 mm	120 MHz 0.12 GHz 120,000 kHz	40 MHz 0.04 GHz 40,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX4-120NV8T	1995	500 nm 0.5 μm 5.0e-4 mm	120 MHz 0.12 GHz 120,000 kHz	40 MHz 0.04 GHz 40,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX4-120V8T	1995	500 nm 0.5 μm 5.0e-4 mm	120 MHz 0.12 GHz 120,000 kHz	40 MHz 0.04 GHz 40,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX4-75	September 1994	500 nm 0.5 μm 5.0e-4 mm	75 MHz 0.075 GHz 75,000 kHz	25 MHz 0.025 GHz 25,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX4-90	September 1994	500 nm 0.5 μm 5.0e-4 mm	90 MHz 0.09 GHz 90,000 kHz	30 MHz 0.03 GHz 30,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DX4-90NV8T	1995	500 nm 0.5 μm 5.0e-4 mm	90 MHz 0.09 GHz 90,000 kHz	30 MHz 0.03 GHz 30,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DXL-40	October 1993	700 nm 0.7 μm 7.0e-4 mm	40 MHz 0.04 GHz 40,000 kHz	40 MHz 0.04 GHz 40,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DXL2-66	September 1993	700 nm 0.7 μm 7.0e-4 mm	66 MHz 0.066 GHz 66,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DXL2-80	September 1993	700 nm 0.7 μm 7.0e-4 mm	80 MHz 0.08 GHz 80,000 kHz	40 MHz 0.04 GHz 40,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486DXLV-33	June 1993		33 MHz 0.033 GHz 33,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Count: 30

Am486SX

Am486SX Processors
Model	Launched	Process	Freq	Bus	Max Mem
Am486SE-25		500 nm 0.5 μm 5.0e-4 mm	25 MHz 0.025 GHz 25,000 kHz	25 MHz 0.025 GHz 25,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486SE-33		500 nm 0.5 μm 5.0e-4 mm	33 MHz 0.033 GHz 33,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486SX-33	July 1993	700 nm 0.7 μm 7.0e-4 mm	33 MHz 0.033 GHz 33,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486SX-40	July 1993	700 nm 0.7 μm 7.0e-4 mm	40 MHz 0.04 GHz 40,000 kHz	40 MHz 0.04 GHz 40,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486SX2-50	February 1994	700 nm 0.7 μm 7.0e-4 mm	50 MHz 0.05 GHz 50,000 kHz	25 MHz 0.025 GHz 25,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486SX2-66	April 1994	700 nm 0.7 μm 7.0e-4 mm	66 MHz 0.066 GHz 66,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Am486SXLV-33		700 nm 0.7 μm 7.0e-4 mm	33 MHz 0.033 GHz 33,000 kHz	33 MHz 0.033 GHz 33,000 kHz	4,096 MiB 4,194,304 KiB 4,294,967,296 B 4 GiB 0.00391 TiB
Count: 7

References

↑ Fletcher, Andrew (2013). Profile of the Worldwide Semiconductor Industry - Market Prospects to 1997: Market Prospects to 1997. Elsevier, 96-97. ISBN 9781483284859.

[book1-1] Fletcher, Andrew (2013). Profile of the Worldwide Semiconductor Industry - Market Prospects to 1997: Market Prospects to 1997. Elsevier, 96-97. ISBN 9781483284859.

[1

designer	AMD +
first announced	February 1992 +
first launched	April 1993 +
full page name	amd/am486 +
instance of	microprocessor family +
instruction set architecture	IA-32 +
main designer	AMD +
manufacturer	AMD +
name	AMD Am486 +
package	PGA-168 + and QFP-208 +
process	700 nm (0.7 μm, 7.0e-4 mm) +, 500 nm (0.5 μm, 5.0e-4 mm) +, 440 nm (0.44 μm, 4.4e-4 mm) + and 350 nm (0.35 μm, 3.5e-4 mm) +
socket	Socket 1 +, Socket 2 + and Socket 3 +
technology	CMOS +
word size	32 bit (4 octets, 8 nibbles) +

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