ICS9DB423B

4-OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2, AND QPI

IDT®

4-OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2, AND QPI

4

ICS9DB423B

REV E 091812

Pin Descriptions for OE_INV=1

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

8OE1#

IN

Active low input for enabling DIF pair 1.

1 =disable outputs, 0 = 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#_133_100

IN

Input to select Bypass(fan-out), QPI PLL (133MHz) or PCIe PLL (100MHz) mode

0 = Bypass mode, M= QPI, 1= PCIe 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 High 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

OE6#

IN

Active low input for enabling DIF pair 6.

1 =disable outputs, 0 = 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.