DatasheetsPDF.com

ICS9250-13

Part Number	ICS9250-13
Manufacturer	Integrated Circuit Systems
Description	Frequency Generator & Integrated Buffers
Published	Dec 11, 2005
Detailed Description	Integrated Circuit Systems, Inc. ICS9250-13 Frequency Generator & Integrated Buffers for PENTIUM/ProTM General Descrip...
Datasheet	ICS9250-13 PDF File

Overview

Integrated Circuit Systems, Inc.
ICS9250-13 Frequency Generator & Integrated Buffers for PENTIUM/ProTM General Description The ICS9250-13 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro or Cyrix.
Eight different reference frequency multiplying factors are externally selectable with smooth frequency transitions.
Spread spectrum may be enabled through I2C programming.
Spread spectrum typically reduces system EMI by 8dB to 10dB.
This simplifies EMI qualification without resorting to board design iterations or costly shielding.
The ICS9250-13 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.
Features 3.
3V outputs: SDRAM, PCI, REF, 48/24MHz 2.
5V or 3.
3V outputs: CPU 20 ohm CPU clock output impedance 20 ohm PCI clock output impedance Skew from CPU (earlier) to PCI clock - 1 to 4 ns, center 2.
6 ns.
No external load cap for CL=18pF crystals ±250 ps CPU, PCI clock skew 400ps (cycle to cycle) CPU jitter Smooth frequency switch, with selections from 50 to 83.
3 MHz CPU.
I2C interface for programming 2ms power up clock stable time Clock duty cycle 45-55%.
56 pin 300 mil SSOP package 3.
3V operation, 5V tolerant input.
440LX/EX type chipset Motherboard single chip clock solution.
Block Diagram Recomended Application: Pin Configuration Power Groups VDDREF = REF (0:1), X1, X2 VDDPCI = PCICLK_F, PCICLK(0:5) VDDSDR = SDRAM (0:11), supply for PLL core, VDD48 = 24MHz, 48MHz VDDLIOAPIC = IOAPIC VDDL2CPU = CPUCLK (0:3) 9250-13 Rev A 3/25/99 56-Pin SSOP * Internal Pull-up Resistor of 120K to VDD on indicated inputs Pentium is a trademark of Intel Corporation I2C is a trademark of Philips Corporation ICS reserves the right to make changes in the device data identified in this publication without further notice.
ICS advises its customers to obtain the latest version of all device data to verify that any informati...

Similar Datasheet

ICS9250-08 Frequency Generator & Integrated Buffers - Integrated Circuit Systems
ICS9250-09 Frequency Timing Generator - Integrated Circuit Systems
ICS9250-10 Frequency Timing Generator - Integrated Circuit Systems
ICS9250-11 Frequency Generator & Integrated Buffers - Integrated Circuit Systems
ICS9250-12 Frequency Generator & Integrated Buffers - Integrated Circuit Systems
ICS9250-13 Frequency Generator & Integrated Buffers - Integrated Circuit Systems
ICS9250-14 Frequency Generator & Integrated Buffers - Integrated Circuit Systems
ICS9250-16 Frequency Generator & Integrated Buffers - Integrated Circuit Systems
ICS9250-18 Frequency Generator & Integrated Buffers - Integrated Circuit Systems
ICS9250-19 Frequency Generator & Integrated Buffers - Integrated Circuit Systems

@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site. (Privacy Policy & Contact)