1668C—04/20/11

9DB633

Six Output Differential Buffer for PCIe Gen3

3

Datasheet

Pin Description

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1

PLL_BW

IN

3.3V input for selecting PLL Band Width

0 = low, 1= high

2

SRC_IN

IN

0.7 V Differential SRC TRUE input

3

SRC_IN#

IN

0.7 V Differential SRC COMPLEMENTARY input

4

v OE1#

IN

Activ e low input for enabling DIF pair 1. This pin has an internal pull-down.

1 =disable outputs, 0 = enable outputs

5

DIF_0

OUT

0.7V differential true clock output

6

DIF_0#

OUT

0.7V differential Complementary clock output

7

VDD

PWR

Power supply, nominal 3.3V

8

GND

IN

Ground pin.

9

DIF_1

OUT

0.7V differential true clock output

10

DIF_1#

OUT

0.7V differential Complementary clock output

11

DIF_2

OUT

0.7V differential true clock output

12

DIF_2#

OUT

0.7V differential Complementary clock output

13

VDD

PWR

Power supply, nominal 3.3V

14

SMBDAT

I/O

Data pin of SMBUS c ircuitry, 5V tolerant

15

SMBCLK

IN

Clock pin of SMBUS circuitry, 5V tolerant

16

VDD

PWR

Power supply, nominal 3.3V

17

DIF_3#

OUT

0.7V differential Complementary clock output

18

DIF_3

OUT

0.7V differential true clock output

19

DIF_4#

OUT

0.7V differential Complementary clock output

20

DIF_4

OUT

0.7V differential true clock output

21

GND

PWR

Ground pin.

22

VDD

PWR

Power supply, nominal 3.3V

23

DIF_5#

OUT

0.7V differential Complementary clock output

24

DIF_5

OUT

0.7V differential true clock output

25

v OE4#

IN

Activ e low input for enabling DIF pair 4. This pin has an internal pull-down.

1 =disable outputs, 0 = enable outputs

26

IREF

OUT

This pin establishes the reference for the differential current-mode output pairs. It

requires a fixed precis ion resistor to ground. 475ohm is the s tandard value for

100ohm differential impedance. Other impedances require different v alues. See

data sheet.

27

GNDA

PWR

Ground pin for the PLL c ore.

28

VDDA

PWR

3.3V power for the PLL core.

Note:

Pins preceeded by ' v ' have internal 120K ohm pull down resistors