CY2277A Overview
The CY2277A is a Clock Synthesizer/Driver for Pentium, Pentium II, 6X86, and K6 portable PCs designed with the Intel® 82430TX or similar chipsets. There are three available options as shown in the selector guide The CY2277A outputs four CPU clocks at 2.5V or 3.3V with up to nine selectable frequencies. There are up to eight 3.3V SDRAM clocks and seven PCI clocks, running at one half the CPU clock frequency.
CY2277A Key Features
- Mixed 2.5V and 3.3V operation
- plete clock solution to meet requirements of Pentium®, Pentium® II, 6x86, or K6 motherboards
- Four CPU clocks at 2.5V or 3.3V
- Up to eight 3.3V SDRAM clocks
- Seven 3.3V synchronous PCI clocks, one free running
- Two 3.3V USB/IO clocks at 48 or 24 MHz, selectable by serial interface
- One 2.5V IOAPIC clock at 14.318 MHz
- Two 3.3V Ref. clocks at 14.318 MHz
- Factory-EPROM programmable CPU, PCI, and USB/IO clock frequencies for custom configuration
- Factory-EPROM programmable output drive and slew rate for EMI customization