94241数据手册Renesas中文资料规格书

描述 Description

The 94241 is a single-chip timing control hub for desktop designs using the VIA PL133-T style chipset with Intel differential PIII processor. It provides all necessary clock signals for such a system. The 94241 is part of a line of clock generators and buffers called TCH™ (Timing Control Hub) that offers full programmability and flexibility on a single clock device. Employing the use of a serially programmable I2C interface, this device can adjust the output clocks by configuring the frequency setting, the output divider ratios, selecting the ideal spread percentage, the output skew, the output strength, and enabling/disabling each individual output clock. TCH also incorporates watchdog timer technology in having a frequency reset feature to provide a safe setting under unstable system conditions.

特性 Features

• 2 - CPUs at 2.5V
• 13 - SDRAM at 3.3V
• 7 - PCI at 3.3V
• 1 - 48MHz, at 3.3V
• 1 - 24MHz at 3.3V
• 2 - REF at 3.3V, 14.318MHz
• Programmable output frequency
• Programmable output rise/fall time
• Programmable output to output skew
• Programmable spread spectrum for EMI control
• Real-time system reset output
• Watchdog timer technology to reset the system if over-clocking causes malfunction
• Uses an external 14.318MHz crystal
• CPU - CPU: < 175ps
• SDRAM - SDRAM: < 500ps
• PCI - PCI: < 500ps
• CPU-SDRAM: < 500ps
• CPU(early)-PCI: Min = 1.0ns, Typ. = 2.0ns, Max = 4.0ns