IDT®

Four Output Differential Buffer for PCIe Gen 1 and Gen 2

ICS9DB403D

REV R 11/1/12

ICS9DB403D

Four Output Differential Buffer for PCIe for Gen 1 and Gen 2

3

Pin Decription When OE_INV = 0

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1VDDR

PWR

3.3V power for differential input clock (receiver). This VDD should be treated

as an analog power rail and filtered appropriately.

2

SRC_IN

IN

0.7 V Differential SRC TRUE input

3

SRC_IN#

IN

0.7 V Differential SRC COMPLEMENTARY input

4

GND

PWR

Ground pin.

5

VDD

PWR

Power supply, nominal 3.3V

6

DIF_1

OUT

0.7V differential true clock output

7

DIF_1#

OUT

0.7V differential Complementary clock output

8OE_1

IN

Active high input for enabling output 1.

0 =disable outputs, 1= enable outputs

9

DIF_2

OUT

0.7V differential true clock output

10

DIF_2#

OUT

0.7V differential Complementary clock output

11

VDD

PWR

Power supply, nominal 3.3V

12

BYPASS#/PLL

IN

Input to select Bypass(fan-out) or PLL (ZDB) mode

0 = Bypass mode, 1= PLL mode

13

SCLK

IN

Clock pin of SMBus circuitry, 5V tolerant.

14

SDATA

I/O

Data pin for SMBus circuitry, 5V tolerant.

15

PD#

IN

Asynchronous active low input pin used to power down the device. The

internal clocks are disabled and the VCO and the crystal osc. (if any) are

stopped.

16

DIF_STOP#

IN

Active low input to stop differential output clocks.

17

HIGH_BW#

IN

3.3V input for selecting PLL Band Width

0 = High, 1= Low

18

VDD

PWR

Power supply, nominal 3.3V

19

DIF_5#

OUT

0.7V differential Complementary clock output

20

DIF_5

OUT

0.7V differential true clock output

21

OE_6

IN

Active high input for enabling output 6.

0 =disable outputs, 1= enable outputs

22

DIF_6#

OUT

0.7V differential Complementary clock output

23

DIF_6

OUT

0.7V differential true clock output

24

VDD

PWR

Power supply, nominal 3.3V

25

OE_INV

IN

This latched input selects the polarity of the OE pins.

0 = OE pins active high, 1 = OE pins active low (OE#)

26

IREF

OUT

This pin establishes the reference for the differential current-mode output

pairs. It requires a fixed precision resistor to ground. 475ohm is the standard

value for 100ohm differential impedance. Other impedances require different

values. See data sheet.

27

GNDA

PWR

Ground pin for the PLL core.

28

VDDA

PWR

3.3V power for the PLL core.