SM8702AM View Datasheet(PDF) - Nippon Precision Circuits

Part Name

Description

Manufacturer

SM8702AM

Clock Generator IC

Nippon Precision Circuits  

NIPPON PRECISION CIRCUITS INC.

SM8702AM

Clock Generator IC

OVERVIEW

The SM8702AM is a clock generator IC that can generate clock signals up to and exceeding 100MHz for per-

sonal computer (PC) motherboards. It uses a single 14.318MHz crystal oscillator element and 2 built-in PLLs

to simultaneously and independently generate 2 CPU clocks, 6 PCI bus clocks, 2 reference clocks with the

same frequency as the crystal element, 48MHz USB interface clock, and 24MHz Super I/O chip clock outputs.

It also has 14 outputs that can function as SDRAM clocks by buffering an external input SDRAM clock.

FEATURES

PINOUT

s Intel® Pentium® II, Pentium® III, and AMD x86-

compatibles supported

s 2.5/3.3V CPU clock outputs and IOAPIC clock

output

s 14 × SDRAM clock outputs (3 DIMMs)

s 2 × CPU clock outputs

(60), 66, 75, 83, 95, 100, 103, 112, (124), 133MHz

CPU/SDRAM clock frequencies. Values in paren-

theses are available as mask options.

s 6 × PCI bus clock outputs (one free-running out-

put)

33MHz or 1/2, 1/3, 1/4 of the CPU clock fre-

quency

s 2 × reference clock outputs and 1 × IOAPIC clock

output

14.318MHz REF/IOAPIC clock frequency

s 1 × 48MHz USB interface clock output

s 1 × 24MHz clock output for Super I/O chip

s I2C serial data bus for frequency/mode output con-

trol

s CPU-stop and PCI-stop functions

s Spread Spectrum Clock Generator (SSCG) out-

puts

Center spread/Down spread, ± 0.5% or ± 1.5%

s 3.3V (VDD) and 2.5/3.3V (VDDL) supply volt-

ages

s 48-pin SSOP package (pin compatible with

ICS9148-26)

APPLICATIONS

s PC motherboards using Intel® Pentium®, Pen-

tium® II/III, AMD-K6 devices, and x86 architec-

ture CPUs

48-pin SSOP (300 mil)

(Top view)

VDD1 1

REF0

VSS

XT

XTN

VDD2

PCICLK_F/MODE

PCICLK0

VSS

PCICLK1

PCICLK2

PCICLK3

PCICLK4

VDD2

BUFFERIN

VSS

SDRAM11/CPU_STOP#

SDRAM10/PCI_STOP#

VDD3

SDRAM9

SDRAM8

VSS

SDATA

SCLK 24

48 VDDL1

IOAPIC

REF1/FS2

VSS

CPUCLK0

CPUCLK1

VDDL2

SDRAM13

SDRAM12

VSS

SDRAM0

SDRAM1

VDD3

SDRAM2

SDRAM3

VSS

SDRAM4

SDRAM5

VDD3

SDRAM6

SDRAM7

VDD4

48MHz/FS0

25 24MHz/FS1

ORDERING INFORMATION

Device

SM8702AM

Package

48-pin SSOP

Intel® and Pentium® are registered trademarks of Intel co..

AMD and AMD-K6 are registered trademarks of Advanced Micro Devices, Inc..

I2C Bus is a registered trademark of Philips Electronics N. V..

NIPPON PRECISION CIRCUITS—1

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