222

PS8315-2

04/08/99

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PI6C103

Precision Clock Synthesizer

for Mobile PCs

PCICLK_F

PCICLK1

XTAL_OUT

PCICLK2

PCICLK3

PCICLK4

PCICLK5

48 MHz

48-24MHz/TS#

REF0/Spread#

CPUCLK1

PCI_STOP#

CPU_STOP#

PWR_DWN#

SEL100/66#

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

XTAL_IN

CPUCLK0

REF1/SEL48#

PinConfiguration

BlockDiagram

Description

The PI6C103 is a high-speed, low-noise clock generator designed

to work with the PI6C18X clock buffer to meet all clock needs

for Mobile Intel Architecture platforms. System clock frequencies

of 66.6 MHz and 100 MHz are supported.

Split supplies of 3.3V and 2.5V are used. The 3.3V power supply

powers everything except the CPU clock. The 2.5V power supply is

usedtopowertheCPUCLKoutputs.2.5VsignalingfollowsJEDEC

standard 8-X. Power sequencing of the 3.3V and 2.5V supplies is

not required.

An asynchronous PWR_DWN# signal may be used to orderly

power down (or up) the system. CPU and PCI clocks may also be

stopped by the CPU_STOP# and PCI_STOP# signals.

The PI6C103 contains the Spread Spectrum function for only those

clocks that synchronize to the CPU clocks (CPU and PCI clocks).

28-Pin

H, L

Features

• Two copies of CPU clock

• 100 MHz or 66.6 MHz operation

• Six copies of PCI clock, (synchronous with CPU clock)

• Two copies of REF clock @ 14.31818 MHz

• One copy of 48 MHz

• One copy of selectable 48/24 MHz

• Power management control input pins

• 28-pin SSOP (H) and TSSOP (L) packages

REF

[0:1]

PCICLK

[1:5]

CPUCLK

[0:1]

REF

OSC

CPU_STOP#

2

2

5

PCICLK_F

48 MHz

48/24 MHz

PCI_STOP#

DIV

÷2

PLL1

XTAL_OUT

XTAL_IN

SEL100/66#

SEL48#

SPREAD#

PWR_DWN#

MUX

PLL2

TS#

• SSC Options:

Device

66MHz

100MHz

PI6C103

–0.67%

–0.65%

PI6C103-05

–1.35%

–1.35%

PI6C103-06

–1.79%

–1.79%