MK1493-02A - Integrated Circuit System

MK1493-02A Networking/pci Clock Generator

The MK1493-02A is a general purpose clock generator that provides an integrated clocking solution for PCI/Networking applications. It provides two pairs of differential CPU clocks, four PCI clocks, seven PCI_X clocks, two reference clocks, additional clock selectable from REF/50 MHz, and six pairs of SSTL2 DDR at 2.5 V. All complementary outputs operate only.

Features

• Packaged in 56-pin TSSOP package
• 2 - Pairs of differential CPU clocks (differential
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• current mode) 4 - PCI @ 3.3 V 7 - PCI_X @ 3.3 V 2 - REF @ 3.3 V, Fixed 6 - Pairs of differential SSTL2 DDR @ 2.5 V 1 - REF/50 MHz, selectable Spread spectrum for EMI control Supports SMBUS index read/write and blocks read/write operations Uses external 25 or 50 MHz crystal or clock CPU output jitter <125 ps PCI cycle to cycle output jitter <250 ps DDR cycle to cycle output jitter <150 ps Block Diagram PLL2 X1 XTAL OSC X2 PLL1 Spread Spectrum 2 CPU Divider PCI Divider REF(0:1) 50MHz/RE.