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ICS9148-46 - Pentium/ProTM System Clock Chip

Description

The ICS9148-46 is part of a reduced pin count two-chip clock solution for designs using an Intel BX style chipset.

Companion SDRAM buffers are ICS9179-03, and -12.

There are two PLLs, with the first PLL capable of spread spectrum operation.

Features

  • • • • • • • • • • • Generates system clocks for CPU, PCI, 14.314 MHz, 48 and 24MHz. Supports single or dual processor systems Skew from CPU (earlier) to PCI clock 1 to 4ns Separate 2.5V and 3.3V supply pins 2.5V outputs: CPU 3.3V outputs: PCI, REF No power supply sequence requirements 28 pin SSOP Spread Sectrum operation optional for PLL1 CPU frequencies to 100MHz are supported. Block Diagram Pin Configuration 28 pin SSOP Power Groups VDD = Supply for PLL core VDD1 = REF(0:1), X1, X2 VDD2 =.

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Datasheet Details

Part number ICS9148-46
Manufacturer Integrated Circuit Systems
File Size 433.73 KB
Description Pentium/ProTM System Clock Chip
Datasheet download datasheet ICS9148-46 Datasheet

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Other Datasheets by Integrated Circuit Systems

Part Number Description
ICS9148-47 Pentium/ProTM System Clock Chip
ICS9148-02 Pentium/ProTM System Clock Chip
ICS9148-03 Frequency Generator & Integrated Buffers
ICS9148-08 Frequency Generator & Integrated Buffers
ICS9148-10 Pentium/ProTM System Clock Chip

Full PDF Text Transcription

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Integrated Circuit Systems, Inc. ICS9148-46 Pentium/ProTM System Clock Chip General Description The ICS9148-46 is part of a reduced pin count two-chip clock solution for designs using an Intel BX style chipset. Companion SDRAM buffers are ICS9179-03, and -12. There are two PLLs, with the first PLL capable of spread spectrum operation. Spread spectrum typically reduces system EMI by 8-10dB. The second PLL provides support for USB (48MHz) and 24MHz requirements. CPU frequencies up to 100MHz are supported. The I2C interface allows stop clock programming, frequency selection, and spread spectrum operation to be programmed. Clock outputs include two CPU (2.5V or 3.3V), five PCI (3.3V), two REF (3.3V), one 48MHz, and one selectable 48_24MHz.
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