2

PI6C20400A

1:4 Clock Driver for Intel PCIe® Chipsets

www.pericom.com

03/27/13

Pin Descriptions

Pin Name

Type

Pin No

Description

SRC&SRC#

Input

2,3

0.7VDifferentialSRCinputfromPI6C410clocksynthesizer

OE_0&OE_3

Input

8,21

3.3VLVTTLinputforenablingoutputs,activehigh.

OE_0forOUT0/OUT0#

OE_3forOUT3/OUT3#

OE_INV

Input

25

3.3VLVTTLinputforinvertingtheOE,SRC_STOP#and

PWRDWN#pins.

When0=samestage

When1=OE_0,OE_3,SRC_STOP#,PWRDWN#inverted.

OUT[0:3]&OUT[0:3]# Output

6,7,9,10,19,20,

22,23

0.7VDifferentialoutputs

PLL/BYPASS#

Input

12

3.3VLVTTLinputforselectingfan-outofPLLoperation.

SCLK

Input

13

SMBuscompatibleSCLOCKinput

SDA

I/O

14

SMBuscompatibleSDATA

IREF

Input

26

Externalresistorconnectiontosetthedifferentialoutputcurrent

SRC_STOP#

Input

16

3.3VLVTTLinputforSRCstop,activelow

PLL_BW#

Input

17

3.3VLVTTLinputforselectingthePLLbandwidth

PWRDWN#

Input

15

3.3VLVTTLinputforPowerDownoperation,activelow

Power

1,5,11,18,24

3.3VPowerSupplyforOutputs

VSS

Ground

4

GroundforOutputs

VSS_A

Ground

27

GroundforPLL

VDD_A

Power

28

3.3VPowerSupplyforPLL

Serial Data Interface (SMBus)

ThispartisaslaveonlySMBusdevicethatsupportsindexedblockreadandindexedblockwriteprotocolusingasingle7-bit

addressandread/writebitasshownbelow.

Address Assignment

A6

A5

A4

A3

A2

A1

A0

W/R

1

1

0

1

1

1

0

0/1

Data Protocol

1bit

7bits

1

1

8bits

1

8bits

1

8bits

1

8bits

1

1bit

Start

bit

Slave

Addr

R/W

Ack

Register

offset

Ack

Byte

Count

=N

Ack

Data

Byte0

Ack

…

Data

ByteN

-1

Ack

Stop

bit

Notes:

1. Registeroffsetforindicatingthestartingregisterforindexedblockwriteandindexedblockread.ByteCountinwritemodecannotbe0.

14-0195