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August 2007 ASM3P2855B rev 0.3 Notice: The information in this document is subject to change without notice. PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018 www.pulsecoresemi.com Custom Clock Generator for Fax System Features • Generates Custom Clocks for FAX system from an inexpensive 24MHz Crystal • 7 x 50MHz synchronized non-Spread Spectrum clocks (for CPU, ASIC2, ASIC3, HDD, and PCI Analyzer, Ethernet, and LAN PHY) • 1 x 50MHz for CPU Timer • 1x 19.52MHz non-spread clock for Scanner • REFOUT Clock • Supply Voltage 3.3 V +/- 0.3V • Available in 16L TSSOP, Green package • Commercial Temperature operation Product Description ASM3P2855B is a part of the two chip custom clock generator solution for NEC FAX system. Together with ASM3P2854A, ASM3P2855B realizes all the eighteen clocks required by the various components and subsystems of the FAX system. It uses an inexpensive 24MHz crystal as the input to generate five synchronized 50MHz non-spread PCI clocks used by CPU, HDD, PCI Analyzer, ASIC2 and ASIC3, two non-spread synchronized 50MHz clocks for Ethernet and LAN PHY, a 50MHz clock for the CPU Timer, and a 19.52MHz non- spread clock used by ASIC1 for Scanner. The custom clock generator ASM3P2855B works with a Supply Voltage of 3.3V. The device is available in a 16L TSSOP Green package and in commercial temperature range. Block Diagram 7 50MHz Crystal Oscillator XIN / CLKIN XOUT 19.52MHz PLL VDD VDD_FOUT GND GND_FOUT 50MHZ REFOUT |
