1680C—08/26/10

9FG830

Eight Output Differential Frequency Generator for PCIe Gen3 and QPI

3

Pin Description

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1

XIN/CLKIN

IN

Crystal input or Reference Clock input

2

X2

OUT

Crystal output, Nominally 14.318MHz

3

VDD

PWR

Power supply, nominal 3.3V

4

GND

PWR

Ground pin.

5

REFOUT

OUT

Reference Clock output

6

vFS2

IN

Frequency select pin. This pin has an internal 120k pull down resistor

7

vOE_7

IN

Active high input for enabling output 7. This pin has a 120kohm pull down.

0 =disable outputs, 1= enable outputs

8

DIF_7

OUT

0.7V differential true clock output

9

DIF_7#

OUT

0.7V differential Complementary clock output

10

VDD

PWR

Power supply, nominal 3.3V

11

DIF_6

OUT

0.7V differential true clock output

12

DIF_6#

OUT

0.7V differential Complementary clock output

13

^OE_6

IN

Active high input for enabling output 6. This pin has an internal 120kohm pull up.

0 = disable outputs, 1= enable outputs

14

VDD

PWR

Power supply, nominal 3.3V

15

GND

PWR

Ground pin.

16

^OE_5

IN

Active high input for enabling output 5. This pin has an internal 120kohm pull up.

0 = disable outputs, 1= enable outputs

17

DIF_5

OUT

0.7V differential true clock output

18

DIF_5#

OUT

0.7V differential Complementary clock output

19

VDD

PWR

Power supply, nominal 3.3V

20

DIF_4

OUT

0.7V differential true clock output

21

DIF_4#

OUT

0.7V differential Complementary clock output

22

vOE_4

IN

Active high input for enabling output 4. This pin as an internal 120kohm pull down.

0 =disable outputs, 1= enable outputs

23

SDATA

I/O

Data pin for SMBus circuitry, 5V tolerant.

24

SCLK

IN

Clock pin of SMBus circuitry, 5V tolerant.

25

DIF_STOP#

IN

Active low input to stop differential output clocks.

26

vSPREAD

IN

Asynchronous, active high input to enable spread spectrum functionality. This pin has

a 120Kohm pull down resistor.

27

^SEL14M_25M#

IN

Select 14.31818 MHz or 25 Mhz input frequency. This pin has an internal 120kohm

pull up resistor.

1 = 14.31818 MHz, 0 = 25 MHz

28

vOE_3

IN

Active high input for enabling output 3. This pin has an internal 120kohm pull down

resistor.

0 =disable outputs, 1= enable outputs

29

DIF_3#

OUT

0.7V differential Complementary clock output

30

DIF_3

OUT

0.7V differential true clock output