ICST ICS9112M-43, ICS9112M-44 Datasheet

Integrated

ICS9112-43/44

Circuit
Systems, Inc.

Preliminary Product Preview

Frequency Generator for Gigabit Ethernet Systems

General Description Features

The ICS9112-43/44 is a high speed clock generator designed
to support Gigabit Ethernet system requirements. The
ICS9112-43/44 generates 125 MHz from a 20 MHz crystal.

An exact frequency multiplying ratio ensures better than
±100 ppm frequency accuracy using a standard AT crystal
with external load capacitors (typically 33pF±5% for an
18pF load crystal). Achieving ±100 ppm over four years
requires the crystal to have a ±20 ppm initial accuracy, ±30
ppm temperature and ±5 ppm/year aging coefficients.

The ICS9112-43/44 with less than 50ps accumulative jitter
is well suited for Gigabit Ethernet applications.

Block Diagram

• Generates 125 MHz clocks from a 20 MHz crystal

• Less than 45ps one sigma jitter (15ps typ.)

• Less than ±130ps absolute jitter

• Less than 50ps accumulative jitter @ 256 cycles

• Rise/fall times less than 1.2ns driving 15pF

• On-chip loop filter components

• 3.0V-5.5V supply range

• 8-pin, 150-mil SOIC package

Applications

• Specifically designed to support the high-speed
clocking requirements of Gigabit Ethernet systems.

9112-43 9112-44 Rev D 3/3/99

PRODUCT PREVIEW documents contain information on new
products in the sampling or preproduction phase of development.
Characteristic data and other specifications are subject to change
without notice.

ICS9112-43/44

Preliminary Product Preview

Pin Configurations

8-Pin SOIC

Pin Descriptions

NIP

REBMUN

1DNGARWP.dnuorggolanA

2DNGWRP.dnuorGlatigiD
31XNI
42XNI.sroticapacdaollanretxeseriuqeR.ecivedmorftuptuoevirdlatsyrC
5EONI

6

7

81KLCTUO.zHM521tuptuokcolC

DDVRWP)34(.ylppustlov0.5+ro3.3+

EMANNIPEPYTNOITPIRCSED

2KLCTUO)44(.zHM521tuptuokcolc
DDVARWP)34(.)egatlovrewoplatigidlauqetsuM(.rewopgolanA

Functionality

EO

100.02521

000.02etatsirT

DDVA+DDVRWP)44(.ylppustlov0.5+ro3.3+,rewopgolanadnalatigiD

2X,1X
)zHM(

8-Pin SOIC

daollanretxeseriuqeR.zHM0.52yllanimon;ecivedottupnikcolcrolatsyrC

.sroticapac

kcolcehtsetatsirtti,wolsiEOnehw:).pu_lluplanretnisah(elbanetuptuO

)TUOF(tuptuo

TUOF

)zHM(

2