ASM3P2854B

www.DataSheet4U.com August 2007 rev 0.3 Custom Clock Generator for Fax System Features Generates Custom Clocks for FAX system from an inexpensive 24MHz Crystal 2x 66.66MHz low EMI (Spread Spectrum) clocks for ASIC1 (System / DDR SDRAM) 1 x 48MHz for USB1.1 HOST 2 x 33.33MHz low EMI (Spread Spectrum) clocks for System / DDR SDRAM of ASIC2 and ASIC3 ASM3P2854B 1x 25MHz low EMI (Spread Spectrum) clock for LCD, Serial port, and buzzer of ASIC1 1x 12MHz for USB PHY (USB2.0) 1x Programmable clock for printer engine control One of the four programmable clock outputs selection through two Select Pins Supply Voltage 3.3V +/- 0.3V Available in 16L TSSOP, Green package Commercial Temperature operation Product Description ASM3P2854B is a part of the two chip custom clock generator solution for NEC FAX system. Together with ASM3P2855A, ASM3P2854B realizes all the seventeen clocks required by the various components and subsystems of the FAX system. It uses an inexpensive 24MHz crystal as the input to generate two 66.66MHz low EMI (spread spectrum) clocks used by ASIC1 for system / DDR SDRAM, two 33.33MHz low EMI (spread spectrum) clocks used by ASIC2 and ASIC3 for system / DDR SDRAM, a 25MHz low EMI (Spread Spectrum) clock used by ASIC1 for LCD, Serial port, and buzzer, a 48MHz clock used by USB1.1 HOST, and a 12MHz clock used by USB PHY clock used for (USB2.0). (PCLK) Printer One of the four of and is Programmable 24.00448MHz, 20.40464MHz frequencies 21.19962MHz ...