Four Output Differential Buffer for PCI Express

ICS9DB401C

REV E 03/18/08

ICS9DB401C

Four Output Differential Buffer for PCI Express

4

Pin Description for OE_INV = 1

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1

VDD

PWR

Power supply, nominal 3.3V

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 complement clock output

8OE1#

IN

Active low input for enabling DIF pair 1.

1 = tri-state outputs, 0 = enable outputs

9

DIF_2

OUT

0.7V differential true clock output

10

DIF_2#

OUT

0.7V differential complement 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 high input pin used to power down the

device. The internal clocks are disabled and the VCO is stopped.

16

SRC_STOP

IN

Active high input to stop SRC outputs.

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 complement clock output

20

DIF_5

OUT

0.7V differential true clock output

21

OE6#

IN

Active low input for enabling DIF pair 6.

1 = tri-state outputs, 0 = enable outputs

22

DIF_6#

OUT

0.7V differential complement 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 current for the differential

current-mode output pairs. This pin requires a fixed precision

resistor tied to ground in order to establish the appropriate

current. 475 ohms is the standard value.

27

GNDA

PWR

Ground pin for the PLL core.

28

VDDA

PWR

3.3V power for the PLL core.