Am486
The Am486 processor family is AMD's equivalent of the i486 family of processors from Intel.
- 3.1 Enhanced Am486DX2
- 3.2 Enhanced Am486DX4
History
Existed in the early 1990s (still) far-reaching agreement between Intel and AMD for the exchange of technology. Therefore, the 486 - CPUs of both families differ initially only marginally. The microcode of early AMD variants corresponded nor the Intel models, which is why 486 CPUs from Intel and AMD at this time showed no relevant differences in practice.
The modified due to technical changes in CPU core and bus interface microcode of Intel DX4 - often i486DX4 called, although Intel has never called him - was allowed AMD but not take over, which is why the Am486DX4 of AMD in-house was developed from the Am486DX2. However, the performance of the Am486DX4 initially remained behind those of the Intel DX4, who was with larger L1 cache, an improved multiplication unit and later also equipped with an improved L2 cache controller.
AMD has the Am486DX4 developed yet for Enhanced Am486DX4 and Am5x86 later. Both are fast 486 CPUs, where AMD caught up on some technical improvements that Intel had already been made at the first Intel DX4. For example, was the Am5x86 - PR75 with its core clock of 133 MHz Pentium 75 quite equal, as the name component " PR75 " (the " PR " stands for Pentium rating ) already tried to suggest.
Model data Am486
Am486DX
Similar to the Intel i486DX
Specifications
- L1 cache: 8 KB
- L2 - Cache: depending on the motherboard or chipset used
- Base 3 with a FSB of 25, 33 or 40 MHz
- Operation voltage ( Vcore ): 5 V
- Release Date: 1993
- Manufacturing Technology: 0.7 micron
- The size? mm ² at? million transistors
- Clock rates: 25, 33 and 40 MHz
Am486DE2
CPU for embedded applications with clock doubling.
Specifications
- L1 cache: 8 KB ( Write Through )
- Operating voltage: 3V and 5V VCore I / O
- Manufacturing Technology:
- Power management, two- pin System Management Interrupt (SMI )
- Clock rate: 66 MHz
- Housing: 208- Lead SQFP or 168-pin PGA
Am486SX
However Corresponds to the Am486DX without integrated coprocessor. Similar to the Intel i486SX
Specifications
- L1 cache: 8 KB
- L2 - Cache: depending on the motherboard or chipset used
- Base 3 with a FSB of 25, 33 or 40 MHz
- Operation voltage ( Vcore ): 5 V
- Date of publication:
- Manufacturing Technology: 0.7 micron
- The size? mm ² at? million transistors
- Clock speeds: 33 and 40 MHz
Am486DX2
Corresponds to the Am486DX, but with internal clock doubling. Comparable to the i486DX2
Specifications
- L1 cache: 8 KB
- L2 - Cache: depending on the motherboard or chipset used
- Base 3 with a FSB of 25, 33 or 40 MHz
- Operation voltage ( Vcore ): 5 V ( 0.7 microns ), later 3.3 V ( 0.5 microns )
- Date of publication:
- Manufacturing Technology: 0.7 micron, 0.5 micron later
- The size? mm ² at? million transistors
- Clock rate: 50 MHz (just 0.7 -micron version ), 66 and 80 MHz
Am486SX2
Corresponds to the Am486SX, but with internal clock doubling. Similar to the Intel i486SX2
Specifications
- L1 cache: 8 KB
- L2 - Cache: depending on the motherboard or chipset used
- Base 3 with a FSB of 25 or 33 MHz
- Operation voltage ( Vcore ): 5 V
- Date of publication:
- Manufacturing Technology: 0.7 micron
- The size? mm ² at? million transistors
- Clock speeds: 50 and 66 MHz
Am486DX4
Corresponds to the Am486DX, but with internal Taktverdreifachung. Similar to the Intel DX4, but with only 8 KB instead of 16 KB L1 cache.
Specifications
- L1 cache: 8 KB
- L2 - Cache: depending on the motherboard or chipset used
- Base 3 with a FSB of 25, 33 or 40 MHz
- Operation voltage ( Vcore ): 3.3V
- Date of publication:
- Manufacturing Technology: 0.5 micron
- The size? mm ² at? million transistors
- Clock rates: 75, 90 ( OEM), 100 and 120 MHz
Model data Enhanced Am486
The Enhanced Am486 supports advanced power saving modes and the write-back process in the L1 cache. Initially, there was only him with 8 KB, later also with 16 KB L1 cache.
Enhanced Am486DX2
Improved version of the Am486DX2: 8 initially and later 16 KB write-back L1 cache
Specifications
- L1 cache: 8 or 16 KB
- L2 - Cache: depending on the motherboard or chipset used
- Base 3 with a FSB of 25, 33 or 40 MHz
- Operation voltage ( Vcore ): 3.30 or 3.45 V
- Date of publication:
- Manufacturing Technology: 0.50 micron (8 KB L1 cache ); 0.35 microns ( 16 KB L1 cache )
- The size? mm ² at? million transistors
- Clock rates: 8 KB L1 cache: 66 and 80 MHz
- 16 KB L1 cache: 66 MHz
Enhanced Am486DX4
Improved version of the Am486DX4: 8 initially and later 16 KB write-back L1 cache
Specifications
- L1 cache: 8 or 16 KB
- L2 - Cache: depending on the motherboard or chipset used
- Base 3 with a FSB of 25, 33 or 40 MHz
- Operation voltage ( Vcore ): 3.30 or 3.45 V
- Date of publication:
- Manufacturing Technology: 0.50 micron (8 KB L1 cache ); 0.35 microns ( 16 KB L1 cache )
- The size? mm ² at? million transistors
- Clock rates: 8 KB L1 cache: 75, 100 and 120 MHz
- 16 KB L1 cache 100 and 120 MHz
Am5x86 (X5 )
Based on the enhanced Am486DX4 16 KB L1 cache. Due to the high clock frequency, the internal Taktvervierfachung and marketing reasons but was sold as 5x86. See Am5x86 for technical details, etc.
Swell
Datasheets
- Enhanced Am486 Microprocessor Family (PDF file, 1.48 MB)
- Am486DE2 (PDF file)
- AMD Am486 info page ( archived)
- Am486DX/DX2 (PDF file, 4.71 MB )