SM8702AM 查看數據表（PDF） - Nippon Precision Circuits

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SM8702AM

Clock Generator IC

Nippon Precision Circuits  

BLOCK DIAGRAM

SM8702AM

XT

XTN

R-Countor

Unlock Detector

Phase

Detector

Charge

Pump

N-Countor

Current

Source

(1st PLL)

VCO

BUFFERIN

Buff. Amp.

SS_CONTROLLER

R-Countor

Unlock Detector

Phase

Detector

N-Countor

Charge

Pump

Current

Source

(2nd PLL)

VCO

DIV/3

to DIV/6

DIV/2

(MS)

DIV/3

1/2

3

FS[0:2]

MODE

SDATA

SCLK

CPU_STOP#

PCI_STOP#

I/O

Latch

I2C

ROM

Control Logic

PCICLK_F

5 PCICLK

[0:4]

2 CPUCLK

[0:1]

14 SDRAM

[0:13]

48MHz

(USB)

24MHz

(Super I/O)

2

REF[0:1]

IOAPIC

PIN DESCRIPTION

Number

1

2

3

4

5

6

7

Name

VDD1

REF0

VSS

XT

XTN

VDD2

PCICLK_F

I/O

Function

– 3.3V supply

I/O 14.318MHz reference clock output

– Ground

I Crystal oscillator input

O Crystal oscillator output

– 3.3V supply

O PCI bus free-running clock output

MODE

I Mode settings (latch input)

8

PCICLK0

O PCI bus clock output

9

VSS

– Ground (3.3V supply)

10

PCICLK1

O PCI bus clock output

Notes

X T, XTN oscillator, REF[0:1] buffer, stop logic, 3.3V line

Cr ystal oscillator, REF[0:1], 3.3Vline

PCI clock output buffers, pre-buffer, stop logic, and

internal circuit logic supply

CPU_STOP# (pin 17) and PCI_STOP# (pin 18) mode

select pin.

MODE = HIGH: Desktop mode

MODE = LOW: Mobile mode

PCI clock output buffers, pre-buffer, stop logic

NIPPON PRECISION CIRCUITS—3

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