ST486DX4V

The following table lists absolute maximum ratings for the ST486DX4 microprocessors. Stresses beyond those listed under Table 2-3 limits may cause permanent damage to the device. These are stress ratings only and do not imply that operation under any conditions other than those listed under "Recommended Operating Conditions" Table 2-4 is possible. Exposure to conditions beyond Table 2-3 may (1) reduce device reliability and (2) result in premature failure even when there is no immediately apparent sign of failure. Prolonged exposure to conditions at or near the absolute maximum  ratings (Table 2-3) may also result in reduced useful life and reliability.

The SGS-THOMSON ST486DX4 3.45 volt CPUs are advanced 486DX/DX2/DX4 compatible processors. These CPUs incorporate an on-chip 8KByte write-back cache and an integrated math coprocessor.

The ST486DX4 on-chip write-back cache allows up to 15% higher performance by eliminating unnecessary external write cycles. On traditional write-through CPUs, these external write cycles can create bus bottlenecks affecting system wide performance.

The ST486DX4 integrated floating point unit, improves performance up to 10% over the 80486DX4 at equal internal frequency as measured using Power Meter Whetstone test.

These processors ST486DX4 are designed to meet the power management requirements in the newest generation of low-power desktops and notebooks. Power is saved by taking advantage of advanced power management features such as static circuitry, SMM, and automatic FPU power-down. Fast entry and exit of SMM allows frequent use of the SMM feature without noticeable performance degradation.

This CPU family ST486DX4 maintains compatibility with the installed base of x86 software and provides essential socket compatibility with the 486DX/DX2/DX4.