ics9148-75 ETC-unknow, ics9148-75 Datasheet

ics9148-75

Manufacturer Part Number

ics9148-75

Description

Frequency Generator Integrated Buffers Mother Boards

Manufacturer

ETC-unknow

Datasheet

1.ICS9148-75.pdf (17 pages)

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Block Diagram

General Description

The ICS9148-75 generates all clocks required for high speed

RISC or CISC microprocessor systems such as Intel

PentiumPro™, AMD™ or Cyrix™. Sixteen different reference

frequency multiplying factors are externally selectable with

smooth frequency transitions.

Spread spectrum may be enabled through I

Spread spectrum typically reduces system EMI by 8dB to

10dB. This simplifies EMI qualification without resorting to

board design iterations or costly shielding. The ICS9148-75

employs a proprietary closed loop design, which tightly

controls the percentage of spreading over process and

temperature variations.

Serial programming I

stop clock programming and frequency selection. The

SDRAM12 output may be used as a feed back into an off chip

PLL.

Frequency Generator & Integrated Buffers for Mother Boards

Power Groups

VDD1 = REF (0:1), X1, X2

VDD2 = PCICLK_F, PCICLK(0:5)

VDD3 = SDRAM (0:11), supply for PLL core

VDD4 = AGP (1:2)

VDD5 = Fixed PLL, 48MHz , AGP0

VDDL = CPUCLK (0:3)

9148-75 Rev C 3/01/00

Integrated

Circuit

Systems, Inc.

C interface allows changing functions,

C programming.

Features

•

Generates the following system clocks:

Skew characteristics:

Supports Spread Spectrum modulation & I

programming for Power Management, Frequency Select

Efficient Power management scheme through power

down PCI, AGP and CPU_STOP clocks.

Uses external 14.318MHz crystal

48 pin 300mil SSOP.

- 3 CPU(2.5V/3.3V) up to 100MHz.

- 6 PCI(3.3V) @ 33.3MHz (including one free

- 3AGP(3.3V) @ 2 x PCI

- 13 SDRAMs(3.3V) up to 100MHz

- 1 REF (3.3V) @ 14.318MHz

- 1 - 48MHz (3.3V) fixed

- CPU – CPU<250ps

- CPU(early) – PCI : 1-4ns

- AGP – PCI: 250ps

- PCI – PCI <500ps

running PCICLK)

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.

* Internal Pull-up Resistor of

240K to 3.3V on indicated inputs

Pin Configuration

48-Pin SSOP

Pentium is a trademark of Intel Corporation

C is a trademark of Philips Corporation

ICS9148-75

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