Overview

Description

The 94228 is a main clock synthesizer chip for AMD-K7 based systems with VIA style chipset. This provides all clocks required for such a system. The 94228 employs serial programming I2C interface as a vehicle for changing output functions, changing output frequency, configuring output strength, configuring output-to-output skew, changing spread spectrum amount, changing group divider ratio, and disabling/enabling individual clocks. This device also has propriety watchdog timer technology which will reset the frequency to a safe setting if the system becomes unstable from over-clocking.

Features

  • 1 - Differential pair open drain CPU clocks at 2.7V
  • 1 - Differential pair push-pull CPU clocks at 2.5V
  • 11 - PCI including 1 free running and 1 early at 3.3V
  • 1 - 48MHz, at 3.3V fixed
  • 1 - 24/48MHz at 3.3V
  • 3 - REF at 3.3V, 14.318MHz
  • Programmable output frequency
  • Programmable output rise/fall time
  • Programmable slew and skew control for CPUCLK, PCICLK, AGP, REF, 48MHz, and 24_48MHz
  • Real-time system reset output
  • Spread spectrum for EMI control typically by 7dB to 8dB, with programmable spread percentage
  • Watchdog timer technology to reset the system if over-clocking causes malfunction
  • Uses an external 14.318MHz crystal

Comparison

Applications

Documentation

Type Title Date
Product Change Notice PDF 361 KB
1 item

Design & Development

Models