2

PS8887D

03/29/10

PI6C20800S

HCSL Clock Buffer

Pin Descriptions

Pin Name

Type

Pin #

Descriptions

SRC_DIV#

Input

1

3.3VLVTTLinputforselectinginputfrequencydivideby2,

activeLOW.

SRC&SRC#

Input

4,5

0.7VDifferentialSRCinputfromPI6C410clocksynthesizer

OE[0:7]

Input

6,7,14,15,35,36,

43,44

3.3VLVTTLinputforenablingoutputs,activeHIGH.

OE_INV

Input

40

3.3VLVTTLinputforinvertingtheOE,SRC_STOP#and

PWRDWN#pins.

When0=samestage

When1=OE[0:7],SRC_STOP#,PWRDWN#inverted.

OUT[0:7]&OUT[0:7]#

Output

8,9,12,13,1617,

20,21,29,30,33,34,

37,38,41,42

0.7VDifferentialoutputs

PLL/BYPASS#

Input

22

3.3VLVTTLinputforselectingfan-outofPLLoperation.

SCLK

Input

23

SMBuscompatibleSCLOCKinput

SDA

I/O

24

SMBuscompatibleSDATA

Input

46

Externalresistorconnectiontosetthedifferentialoutputcurrent

SRC_STOP#

Input

27

3.3VLVTTLinputforSRCstop,activeLOW

PLL_BW#

Input

28

3.3VLVTTLinputforselectingthePLLbandwidth

PWRDWN#

Input

26

3.3VLVTTLinputforPowerDownoperation,activeLOW

LOCK

Output

45

3.3VLVTTLoutput,transitionhighwhenPLLlockisachieved

(Latchedoutput)

Power

2,11,19,31,39

3.3VPowerSupplyforOutputs

Ground

3,10,18,25,32

GroundforOutputs

Ground

47

GroundforPLL

Power

48

3.3VPowerSupplyforPLL

Serial Data Interface (SMBus)

PI6C20800SisaslaveonlySMBusdevicethatsupportsindexedblockreadandindexedblockwriteprotocolusingasingle7-bit

addressandread/writebitasshownbelow.

Address assignment

A6

A5

A4

A3

A2

A1

A0

R/W

1

1

0

1

1

1

0

0/1

1bit

7bits

1

1

8bits

1

8bits

1

8bits

1

8bits

1

1bit

Start

bit

Slave

Addr

W

Ack

Register

offset

Ack

Byte

Count

=N

Ack

Data

Byte

Offset

Ack

Data

ByteN

-1

Ack Stopbit

Note:

1. Registeroffsetforindicatingthestartingregisterforindexedblockwriteandindexedblockread.ByteCountinwritemodecannotbe0.

10-0150