ICS9148F-82 데이터 시트보기 (PDF) - Integrated Circuit Systems

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ICS9148F-82

Frequency Generator & Integrated Buffers for PENTIUM/Pro™

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

ICS9148 - 82

Frequency Generator & Integrated Buffers for PENTIUM/ProTM

General Description

The ICS9148-82 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 ICS9148-82

employs a proprietary closed loop design, which tightly

controls the percentage of spreading over process and

temperature variations.

Serial programming I2C interface allows changing functions,

stop clock programming and frequency selection. The

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

PLL.

Features

• Generates the following system clocks:

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

- 6 PCI(3.3V) @ 33.3MHz

- 3AGP(3.3V) @ 2 x PCI

- 13 SDRAMs(3.3V) up to 100MHz

- 1 REF (3.3V) @ 14.318MHz

• Skew characteristics:

- CPU – CPU<250ps

- CPU(early) – PCI : 1-4ns, Center 2.6ns

- AGP - PCI: 500ps

• Supports Spread Spectrum modulation & I2C

programming for Power Management, Frequency Select

• Efficient Power management scheme through PCI and

CPU STOP CLOCKS.

• Uses external 14.318MHz crystal

• 48 pin 300mil SSOP.

Block Diagram

Pin Configuration

Power Groups

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

VDD2 = PCICLK_F, PCICLK(0:5)

VDD3 = SDRAM (0:12), supply for PLL core

VDD4 = AGP (1:2)

VDD5 = Fixed PLL, 48MHz , AGP0

VDDL = CPUCLK (0:2)

9148-82 Rev A 3/25/99

48-Pin SSOP

* Internal Pull-up Resistor of

240K to 3.3V 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

information being relied upon by the customer is current and accurate.

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