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ICS9248YF-78 Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS9248YF-78 Datasheet(HTML) 1 Page - Integrated Circuit Systems |
1 / 13 page Integrated Circuit Systems, Inc. General Description Features ICS9248-78 Block Diagram Pentium II is a trademark of Intel Corporation I 2C is a trademark of Philips Corporation Frequency Timing Generator for Pentium II Systems 9248-78 Rev A 7/21/99 Pin Configuration Generates the following system clocks: - 2 - CPUs @ 2.5V, up to 150MHz. - 1 - IOAPIC @ 2.5V, PCI/2MHz. - 9 SDRAMs (3.3V), up to150MHz. -2-3V66@3.3V,2xPCIMHz. - 8 - PCIs @ 3.3V. - 1 - 48MHz, @ 3.3V fixed. -2-REF@3.3V,14.318Hz. - 1 - 24MHz, @ 3.3V fixed. Supports spread spectrum modulation , down spread 0 to -0.5%, ±0.25% center spread. I2C support for power management. Efficient power management scheme through PD#. Uses external 14.138 MHz crystal. 48-Pin 300 mil SSOP The ICS9248-78 is a single chip clock for Intel Pentium II. It provides all necessary clock signals for such a system. Spread spectrum may be enabled through I2C programming. Spread spectrum typically reduces EMI by 8dB to 10 dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9248-78 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations. Power Groups GNDREF,VDDREF=REF,Crystal GND3V66,VDD3V66=3V66 GNDPCI,VDDPCI=PCICLKs GNDCOR,VDDCOR=PLLCORE GND48,VDD48=48 GNDSDR,VDDSDR=SDRAM GNDLCPU,VDDLCPU=CPUCLK GNDLPCI,VDDLAPIC=IOAPIC 1. These pins will have 2X drive strength. * 120K ohm pull-up to VDD on indicated inputs. Preliminary Product Preview PRODUCT PREVIEW documents contain information on new products in the sampling or preproduction phase of development. Characteristic data and other specifications are subject to change without notice. |
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