IDT®

Two Output Differential Buffer for PCIe Gen1 & Gen2

852

REV Q 08/27/13

ICS9DB102

Two Output Differential Buffer for PCIe Gen1 & Gen2

2

Pin Configuration

20-pin SSOP & TSSOP

VDD

GND

5,9,12,16

6,15

PCI Express Outputs

96

SMBUS

20

19

IREF

20

19

Analog VDD & GND for PLL core

Description

Pin Number

Power Groups

Pin Description

PLL_BW 1

20 VDDA

CLK_INT 2

19 GNDA

C LK_INC 3

18 IREF

vCLKREQ0# 4

17 vCLKREQ1#

VDD 5

16 VDD

GND 6

15 GND

PCIEXT0 7

14 PCIEXT1

PCIEXC0 8

13 PCIEXC1

VDD 9

12 VDD

SMBD AT 10

11 SMBCLK

Note: Pins preceeded by ' v ' have internal

120K ohm pull down resistors

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1PLL_BW

IN

3.3V input for selecting PLL Band Width

0 = low, 1= high

2

CLK_INT

IN

True Input for differential reference clock.

3

CLK_INC

IN

Complementary Input for differential reference clock.

4

v CLKREQ0#

IN

Output enable for PCI Expres s output pair 0.

0 = enabled, 1 =disabled

5

VDD

PWR

Power supply , nominal 3.3V

6

GND

PWR

Ground pin.

7

PCIEXT0

OUT

True clock of differential PCI_Express pair.

8

PCIEXC0

OUT

Complementary clock of differential PCI_Express pair.

9

VDD

PWR

Power supply , nominal 3.3V

10

SMBDAT

I/O

Data pin of SMBUS c ircuitry, 5V tolerant

11

SMBCLK

IN

Clock pin of SMBUS c ircuitry, 5V tolerant

12

VDD

PWR

Power supply , nominal 3.3V

13

PCIEXC1

OUT

Complementary clock of differential PCI_Express pair.

14

PCIEXT1

OUT

True clock of differential PCI_Express pair.

15

GND

PWR

Ground pin.

16

VDD

PWR

Power supply , nominal 3.3V

17

v CLKREQ1#

IN

Output enable for PCI Expres s output pair 1.

0 = enabled, 1 =disabled

18

IREF

OUT

This pin establishes the reference for the differential current-mode

output pairs. It requires a fix ed precision resistor to ground. 475ohm is

the standard value for 100ohm differential impedance. Other

impedanc es require different values. See data sheet.

19

GNDA

PWR

Ground pin for the PLL c ore.

20

VDDA

PWR

3.3V power for the PLL core.

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

Note: