ICS843001BGI-23LFT - Integrated Device Technology

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

GENERAL DESCRIPTION

The ICS843001I-23 is a highly versatile, low

phase noise LVPECL/LVCMOS Synthesizer

which can generate low jitter reference clocks

for a variety of communication applications

and is a member of the HiPerClocksTM family

of high performance clock solutions from ICS.

The dual crystal interface allows the synthesizer to

support up to three communication standards in a given

application (i.e. SONET with a 19.44MHz crystal, 1Gb/10Gb

Ethernet and Fibre Channel using a 25MHz crystal). The

rms phase jitter performance is typically less than 1ps, thus

making the device acceptable for use in demanding

applications such as OC48 SONET, GbE/10Gb Ethernet

and SAN applications. The ICS843001I-23 is packaged in

a small 24-pin TSSOP package.

FEATURES

• One 3.3V LVPECL output pair and

one LVCMOS/LVTTL REF_OUT output

• Selectable crystal oscillator interfaces

or LVCMOS/LVTTL single-ended input

• Crystal and CLK range: 17.5MHz - 29.54MHz

• Able to generate GbE/10GbE/12GbE, Fibre Channel

(1Gb/4Gb/10Gb), PCI-E and SATA from a 25MHz crystal

• VCO range: 1.12GHz - 1.3GHz

• Supports the following applications:

SONET, Ethernet, Fibre Channel, Serial ATA, and HDTV

• RMS phase jitter @ 622.08MHz (12kHz - 20MHz):

<1ps (typical) design target

• Supply modes:

VCC/VCCO

3.3V/3.3V

3.3V/2.5V

2.5V/2.5V

• -40°C to 85°C ambient operating temperature

• Available in both standard and lead-free RoHS-compliant

packages

HiPerClockS™

ICS

PIN ASSIGNMENT

Phase

Detector VCO

000 ÷44

001 ÷45

010 ÷48

011 ÷50

100 ÷51

111 ÷64 (default)

000 ÷2

001 ÷4

010 ÷5

011 ÷6

100 ÷8 (default)

101 ÷10

110 ÷12

111 ÷16

OSC

ICS843001I-23

24-Lead TSSOP

4.40mm x 7.8mm x 0.92mm

package body

G Package

Top View

VCCO_LVCMOS

VCCO_LVPECL

VEE

VCCA

VCC

XTAL_OUT1

XTAL_IN1

REF_OUT

VEE

OE_REF

SEL1

SEL0

CLK

XTAL_IN0

XTAL_OUT0

BLOCK DIAGRAM

N2:N0

SEL0

SEL1

XTAL_IN0

XTAL_OUT0

XTAL_IN1

XTAL_OUT1

CLK

M2:M0

OE_REF

Pulldown

REF_OUT

Pulldown

Pullup

The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on

initial product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications

without notice.

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

TABLE 1. PIN DESCRIPTIONS

TABLE 2. PIN CHARACTERISTICS

rebmuNemaNepyTnoitpircseD

SOMC_OCC

rewoP .tuptuoTUO_FERLTTVL/SOMCVLrofnipylppustuptuO

3,21N,0NtupnInwodlluP .C3elbaTeeS.sniptcelesredividtuptu

.slevelecafretniLTTVL/SOMCVL

42NtupnIpulluP

LCEPVL_OCC

rewoP.tuptuoLCEPVLrofnipylppustuptuO

7,6Qn,QtupuO.slevelecafretniLCEPVL.riaptuptuolaitnereffiD

32,8V

rewoP.nipylppusevitageN

ACC

rewoP.nipylppusgolanA

01V

rewoP.nipylppuseroC

,1TUO_LATX

1NI_LATX tupnI ,tuptuoehtsi1TUO_LATX.ecafretnilatsyrctnanoserlellaraP

upniehtsi1NI_LATX

,0TUO_LATX

0NI_LATX tupnI ,tuptuoehtsi0TUO_LATX.ecafretnilatsyrctnanoserlellaraP

.tu

pniehtsi0NI_LATX

51KLCtupnInwodlluP.tupnikcolcLTTVL/SOMCVL

71,611LES,0LEStupnInwodlluP.slevelecafretniLTTVL/SOM

CVL.sniptcelesXUMtupnI

81RMtupnInwodlluP

erasredividlanretnieht,HGIHcigolnehW.teseRretsaMHGIHevitcA

otQntup

tuodetrevniehtdnawologotQtuptuoeurtehtgnisuacteser

erastuptuoehtdnasredividlanretnieht,WOLcigolnehW.hg

ihog

.slevelecafretniLTTVL/SOMCVL.delbane

12,02,912M,1M,0MtupnIpulluP .B3elbaTeeS.sniptcelesredividkcabdeeF

.slevelecafretniLTTVL/SOMCVL

22FER_EOtupnInwodlluP .E3elbaTeeS.woLtluafeD.elbanetuptuokcolcecnerefeR

.sleve

lecafretniLTTVL/SOMCVL

42TUO_FERtuptuO .slevelecafretniLTTVL/SOMCVL.tuptuokcolcecnerefeR

:ETON nwodlluPdnap

ulluP .seulavlacipytrof,scitsiretcarahCniP,2elbaTeeS.srotsisertupnilanretniotrefer

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

ecnaticapaCtupnI 4Fp

NWODLLUP

rotsiseRnwodlluPtupnI 15kΩ

PULLUP

rotsiseRpulluPtupnI 15kΩ

tuo

ecnadepmItuptuOTUO_FER5721Ω

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

TABLE 3A. COMMON CONFIGURATIONS TABLE

tupnI kcabdeeF

rediviD )zHM(OCVeulaVrediviDN ycneuqerFtuptuO

)zHM( noitacilppA

)zHM(tupnILATX

724488116152.47VTDH

57.428488116152.47VTDH

44.914661.44218 25.551TENOS

44.914661.44212 80.226TENOS

44.914661.44214 40.113TENOS

5205052101521EgiG

520505218 52.651EgiG01

520505215 052EgiG

520505214 5.213IIMGX

520505212 526EgiG01

525452116 5.781EgiG21

5284002121001sserpxEICP

528400218 051ATAS

528400216157ATAS

521557212152.601lennahCerbiF

521557218 573.951lennahCerbiFgiG01

521557216 5.212lennahCerbiFgiG4

TABLE 3B. PROGRAMMABLE M OUTPUT DIVIDER

FUNCTION TABLE

TABLE 3C. PROGRAMMABLE N OUTPUT DIVIDER

FUNCTION TABLE

stupnI tupnIecnerefeRedoMLLP

1LES0LES

00 0LATXevitcA

01 1LATXevitcA

10 KLCevitcA

11 KLCssapyB

TABLE 3D. BYPASS MODE FUNCTION TABLE

stupnI eulaVediviDN

2N1N0N

000 2

00 1 4

010 5

011 6

10 0 8

)tluafed(

10 1 01

110 21

111 61

TABLE 3E. OE_REF OUTPUT FUNCTION TABLE

stupnI rediviDM

eulaV

ycneuqerFtupnI

2M1M0MmuminiMmumixaM

000 445.5245.92

00 1 549.4288.82

010 843.3280.72

011 054.220.62

10 0 150.2294.52

11146

)tluafed(

5.7113.02

stupnItuptuO

FER_EOTUO_FER

0Z-iH

1evitcA

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VCC = VCCA = VCCO_LVPECL, VCCO_LVCMOS = 3.3V±5%, TA = -40°C TO 85°C

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V

CC 4.6V

Inputs, VI-0.5V to VCC + 0.5V

Outputs, IO (LVPECL)

Continuous Current 50mA

Surge Current 100mA

Outputs, VO (LVCMOS) -0.5V to VCCO + 0.5V

Package Thermal Impedance, θJA 70°C/W (0 mps)

Storage Temperature, T

STG -65°C to 150°C

NOTE: Stresses beyond those listed under Absolute

Maximum Ratings may cause permanent damage to the

device. These ratings are stress specifications only. Functional

operation of product at these conditions or any conditions be-

yond those listed in the DC Characteristics or AC Character-

istics is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect product reliability.

TABLE 4B. POWER SUPPLY DC CHARACTERISTICS, VCC = VCCA = 3.3V±5%, VCCO_LVPECL, VCCO_LVCMOS = 2.5V±5%,

TA = -40°C TO 85°C

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

egatloVylppuSeroC531.33.3564.3V

ACC

egatloVylppuSgolanA531.33.3564.3V

LCEPVL_OCC

egatloVylppuStuptuO531.33.3564.3V

SOMCVL_OCC

egatloVylppuStuptuO531.33.3564.3V

tnerruCylppuSrewoP 0=FER_EODBTAm

zHM45.92=TUO_FER,1=FER_EODBTAm

ACC

tnerruCylppuSgolanA 5Am

LCEPVL_OCC

tnerruCylppuStuptuO0=FER_EODBTAm

SOMCVL_OCC

tnerruCylppuStuptuOzHM45.92=TUO_FER,1=FER_EODBTAm

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

egatloVylppuSeroC531.33.3564.3V

ACC

egatloVylppuSgolanA531.33.3564.3V

LCEPVL_OCC

egatloVylppuStuptuO526.25.2526.2V

SOMCVL_OCC

egatloVylppuStuptuO526.25.2526.2V

tnerruCylppuSrewoP 0=FER_EODBTAm

zHM45.92=TUO_FER,1=FER_EODBTAm

ACC

tnerruCylppuSgolanA DBTAm

LCEPVL_OCC

tnerruCylppuStuptuO0=FER_EODBTAm

SOMCVL_OCC

tnerruCylppuStuptuOzHM45.92=TUO_FER,1=FER_EODBTAm

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

TABLE 4E. LVPECL DC CHARACTERISTICS, VCC = VCCA = VCCO_LVPECL = 3.3V±5% OR 2.5V±5%, OR

VCC = VCCA = 3.3V±5%, VCCO_LVPECL = 2.5V±5%, TA = -40°C TO 85°C

TABLE 4D. LVCMOS / LVTTL DC CHARACTERISTICS, VCC = VCCA = VCCO_LVCMOS = 3.3V±5% OR 2.5V±5%, OR

VCC = VCCA = 3.3V±5%, VCCO_LVCMOS = 2.5V±5%, TA = -40°C TO 85°C

TABLE 4C. POWER SUPPLY DC CHARACTERISTICS, VCC = VCCA = VCCO_LVPECL, VCCO_LVCMOS = 2.5V±5%, TA = -40°C TO 85°C

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

egatloVylppuSeroC526.25.2526.2V

ACC

egatloVylppuSgolanA526.25.2526.2V

LCEPVL_OCC

egatloVylppuStuptuO526.25.2526.2V

SOMCVL_OCC

egatloVylppuStuptuO526.25.2526.2V

tnerruCylppuSrewoP 0=FER_EODBTAm

zHM45.92=TUO_FER,1=FER_EODBTAm

ACC

tnerruCylppuSgolanA 5Am

LCEPVL_OCC

tnerruCylppuStuptuO0=FER_EODBTAm

SOMCVL_OCC

tnerruCylppuStuptuOzHM45.92=TUO_FER,1=FER_EODBTAm

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

egatloVhgiHtupnI V

V3.3=2V

3.0+V

V5.2=7.1V

3.0+V

egatloVwoLtupnI V

V3.3=3.0-8.0V

V5.2=3.0-7.0V

tupnI

tnerruChgiH

,1LES,0LES,KLC

1N,0N,RM,FER_EO

V564.3=

V526.2ro 051Aµ

2M:0M,2N V

V564.3=

V526.2ro 5Aµ

tupnI

tnerruCwoL

,1LES,0LES,KLC

1N,0N,RM,FER_EO

,V526.2roV564.3=

V0= 5-Aµ

2M:0M,2N V

,V526.2roV564.3=

V0= 051-Aµ

hgiHtuptuO

1ETON;egatloV TUO_FER V

SOMCVL_OCC

V564.3=6.2V

SOMCVL_OCC

V526.2=8.1V

woLtuptuO

1ETON;egatloV TUO_FER V

SOMCVL_OCC

V564.3=

V526.2ro 5.0V

Δ/V ΔTetaRegdEtupnIKLC%08-%02DBTsn/V

05htiwdetanimrettuptuO:1ETON ΩVot

SOMCVL_OCC

,noitceSnoitamrofnItnemerusaeMretemaraPeeS.2/

.smargaid"margaiDtiucriCtseTdaoLtuptuO"

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

1ETON;egatloVhgiHtuptuOV

LCEPVL_OCC

4.1-V

LCEPVL_OCC

9.0-V

1ETON;egatloVwoLtuptuOV

LCEPVL_OCC

0.2-V

LCEPVL_OCC

7.1-V

GNIWS

gniwSegatloVtuptuOkaeP-ot-kaeP6.00.1V

05htiwdetanimretstuptuO:1ETON ΩVot

LCEPVL_OCC

.V2-

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

TABLE 6A. AC CHARACTERISTICS, VCC = VCCA = VCCO_LVPECL, VCCO_LVCMOS = 3.3V±5%, TA = -40°C TO 85°C

TABLE 5. CRYSTAL CHARACTERISTICS

retemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

noitallicsOfoedoM latnemadnuFzHM

ycneuqerF 5.7145.92zHM

)RSE(ecn

atsiseRseireStnelaviuqE 05 Ω

ecnaticapaCtnuhS 7Fp

leveLevirD 1Wm

.latsyrctnanoserlellarapFp81nagnisudeziretcar

ahC:ETON

TABLE 6B. AC CHARACTERISTICS, VCC = VCCA = 3.3V±5%, VCCO_LVPECL, VCCO_LVCMOS = 2.5V±5%,

TA = -40°C TO 85°C

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

TUO

ycneuqerFtuptuO 65056zHM

noitagaporP

1ETON,yaleD

otKLC

TUO_FER DBTsn

t)Ø(tij ;)modnaR(,rettiJesahPSMR

3,2ETON )zHM02-zHk21(zHM80.226DBTsp

OCV

egnaRkcoLOCVLLP 21.13.1zHG

LES_

emiTtceleS DBTsm

emiTkcoLLLP DBTsm

tuptuO

emiTllaF/esiR

Qn/Q%08ot%02005sp

TUO_FER%08ot%02005sp

cdoelcyCytuDtuptuO Qn/Q05%

TUO_FER05%

VehtmorfderusaeM:1ETO

Vottupniehtfo2/

SOMCVL_OCC

.tuptuoehtfo2/

.latsyrcztrauqzHM44.91agnisuderusaemrettijesahP:2ETON

.56dradnatSCEDEJhtiwecnadroccanide

nifedsiretemarapsihT:3ETON

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

TUO

ycneuqerFtuptuO 65056zHM

noitagaporP

1ETON,yaleD

otKLC

TUO_FER DBTsn

t)Ø(tij ;)modnaR(,rettiJesahPSMR

3,2ETON )zHM02-zHk21(zHM80.226DBTsp

OCV

egnaRkcoLOCVLLP 21.13.1zHG

LES_

emiTtceleS DBTsm

emiTkcoLLLP DBTsm

tuptuO

emiTllaF/esiR

Qn/Q%08ot%02005sp

TUO_FER%08ot%02005sp

cdoelcyCytuDtuptuO Qn/Q05%

TUO_FER05%

VehtmorfderusaeM:1ETO

Vottupniehtfo2/

SOMCVL_OCC

.tuptuoehtfo2/

.latsyrcztrauqzHM44.91agnisuderusaemrettijesahP:2ETON

.56dradnatSCEDEJhtiwecnadroccanide

nifedsiretemarapsihT:3ETON

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

TABLE 6C. AC CHARACTERISTICS, VCC = VCCA = VCCO_LVPECL, VCCO_LVCMOS = 2.5V±5%, TA = -40°C TO 85°C

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

TUO

ycneuqerFtuptuO 65056zHM

noitagaporP

1ETON,yaleD

otKLC

TUO_FER DBTsn

t)Ø(tij ;)modnaR(,rettiJesahPSMR

3,2ETON )zHM02-zHk21(zHM80.226DBTsp

OCV

egnaRkcoLOCVLLP 21.13.1zHG

LES_

emiTtceleS DBTsm

emiTkcoLLLP DBTsm

tuptuO

emiTllaF/esiR

Qn/Q%08ot%02005sp

TUO_FER%08ot%02005sp

cdoelcyCytuDtuptuO Qn/Q05%

TUO_FER05%

VehtmorfderusaeM:1ETO

Vottupniehtfo2/

SOMCVL_OCC

.tuptuoehtfo2/

.latsyrcztrauqzHM44.91agnisuderusaemrettijesahP:2ETON

.56dradnatSCEDEJhtiwecnadroccanide

nifedsiretemarapsihT:3ETON

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

PARAMETER MEASUREMENT INFORMATION

3.3V CORE/2.5V LVPECL OUTPUT LOAD AC TEST CIRCUIT

2.5V LVPECL OUTPUT LOAD AC TEST CIRCUIT

3.3V LVPECL OUTPUT LOAD AC TEST CIRCUIT

SCOPE

nQx

LVPECL

-1.3V±0.165V

2.5V LVCMOS OUTPUT LOAD AC TEST CIRCUIT

VCC,

VCCA,

VCCO_LVPECL

VEE

3.3V CORE/2.5V LVCMOS OUTPUT LOAD AC TEST CIRCUIT

3.3V LVCMOS OUTPUT LOAD AC TEST CIRCUIT

SCOPE

LVCMOS

1.65±5%

-1.65V±5%

VCC,

VCCA,

VCCO_LVCMOS

VEE

SCOPE

nQx

LVPECL

2.8V±0.04V

-0.5V±0.125V

VCC,

VCCA

VEE

SCOPE

LVCMOS

DDO

1.25±5%

-1.25V±5%

VCC,

VCCA

VEE

SCOPE

nQx

LVPECL

-0.5V±0.125V

VCC,

VCCA,

VCCO_LVPECL

VEE

SCOPE

LVCMOS

1.25±5%

-1.25V±5%

VCC,

VCCA,

VCCO_LVCMOS

VEE

VCCO_LVPECL VCCO_LVCMOS

2.05±5%

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

CCO_LVCMOS

REF_OUT

tPERIOD

PERIOD

odc = x 100%

CLK

RMS PHASE JITTER

PROPAGATION DELAY

Clock

Outputs 20%

80% 80%

20%

SWING

OUTPUT RISE/FALL TIME

Phase Noise Mas

Offset Frequency

Phase Noise Plot

RMS Jitter = Area Under the Masked Phase Noise Plot

Noise Power

LVPECL OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD

tPERIOD

tPW

tPERIOD

odc = x 100%

CCO_LVCMOS

tPW

REF_OUT

LVCMOS OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

APPLICATION INFORMATION

As in any high speed analog circuitry, the power supply pins

are vulnerable to random noise. The ICS843001I-23 provides

separate power supplies to isolate any high switching

noise from the outputs to the internal PLL. VCC, VCCA, and VCCO_x

should be individually connected to the power supply

plane through vias, and bypass capacitors should be

used for each pin. To achieve optimum jitter performance,

power supply isolation is required. Figure 1 illustrates how

a 10Ω resistor along with a 10µF and a .01μF bypass

capacitor should be connected to each VCCA.

POWER SUPPLY FILTERING T ECHNIQUES

FIGURE 1. POWER SUPPLY FILTERING

10Ω

VCCA

10μF

.01μF

3.3V or 2.5V

.01μF

VCC

INPUTS:

CRYSTAL INPUT:

For applications not requiring the use of the crystal oscillator

input, both XTAL_IN and XTAL_OUT can be left floating.

Though not required, but for additional protection, a 1kΩ

resistor can be tied from XTAL_IN to ground.

CLK INPUT:

For applications not requiring the use of the test clock, it can

be left floating. Though not required, but for additional

protection, a 1kΩ resistor can be tied from the CLK input to

ground.

CONTROL PINS:

All control pins have internal pull-ups or pull-downs; additional

resistance is not required but can be added for additional

protection. A 1kΩ resistor can be used.

RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS

OUTPUTS:

LVCMOS OUTPUT:

All unused LVCMOS output can be left floating. We

recommend that there is no trace attached.

LVPECL OUTPUT

All unused LVPECL outputs can be left floating. We

recommend that there is no trace attached. Both sides of the

differential output pair should either be left floating or

terminated.

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

TERMINATION FOR 3.3V LVPECL OUTPUT

- 2V

50Ω50Ω

RTT

= 50Ω

FOUT FIN

RTT = Z

((V

+ V

) / (V

– 2)) – 2

3.3V

125Ω125Ω

84Ω84Ω

Zo = 50Ω

FOUT FIN

The clock layout topology shown below is a typical ter-

mination for LVPECL outputs. The two different layouts

mentioned are recommended only as guidelines.

FOUT and nFOUT are low impedance follower outputs

that generate ECL/LVPECL compatible outputs. There-

fore, terminating resistors (DC current path to ground)

or current sources must be used for functionality. These

FIGURE 3B. LVPECL OUTPUT T ERMINATIONFIGURE 3A. LVPECL OUTPUT T ERMINATION

outputs are designed to drive 50Ω transmission lines.

Matched impedance techniques should be used to maxi-

mize operating frequency and minimize signal distor-

tion. Figures 3A and 3B show two different layouts which

are recommended only as guidelines. Other suitable

clock layouts may exist and it would be recommended

that the board designers simulate to guarantee compat-

ibility across all printed circuit and clock component pro-

cess variations.

CRYSTAL INPUT INTERFACE

The ICS843001I-23 has been characterized with 18pF

parallel resonant crystals. The capacitor values shown in

Figure 2. CRYSTAL INPUt INTERFACE

Figure 2 below were determined using an 18pF parallel

resonant crystal and were chosen to minimize the ppm error.

ICS84332

XTA L_ I N

XTA L_OU T

18pF Parallel Cry stal

22p

ICS843001I-23

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

TERMINATION FOR 2.5V LVPECL OUTPUT

Figure 4A and Figure 4B show examples of termination for

2.5V LVPECL driver. These terminations are equivalent to ter-

minating 50Ω to VCC - 2V. For VCC = 2.5V, the VCC - 2V is very

close to ground level. The R3 in Figure 4B can be eliminated

and the termination is shown in Figure 4C.

FIGURE 4C. 2.5V LVPECL TERMINATION EXAMPLE

FIGURE 4B. 2.5V LVPECL DRIVER T ERMINATION EXAMPLE

FIGURE 4A. 2.5V LVPECL DRIVER T ERMINATION EXAMPLE

62.5

Zo = 50 Ohm

250

2.5V

2,5V LVPECL

Driv er

62.5

250

Zo = 50 Ohm

2.5V

VCC=2.5V

Zo = 50 Ohm

2,5V LVPECL

Driver

VCC=2.5V

2.5V

2,5V LVPECL

Driv er

VCC=2.5V

2.5V

Zo = 50 Ohm

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

RELIABILITY INFORMATION

TRANSISTOR COUNT

The transistor count for ICS843001I-23 is: 4165

TABLE 7. θJAVS. AIR FLOW TABLE FOR 24 LEAD TSSOP

θθ

θJA by Velocity (Meters per Second)

0 1 2.5

Multi-Layer PCB, JEDEC Standard Test Boards 70°C/W 65°C/W 62°C/W

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

PACKAGE OUTLINE - G SUFFIX FOR 24 LEAD TSSOP

TABLE 8. PACKAGE DIMENSIONS

Reference Document: JEDEC Publication 95, MO-153

LOBMYS sretemilliM

muminiMmumixaM

N42

A--02.1

1A50.051.0

2A08.050.1

b91.003.0

c90.002.0

D07.709.7

ECISAB04.6

1E03.405.4

eCISAB56.0

4.057.0

α°0°8

aaa--01.0

843001AGI-23 www.icst.com/products/hiperclocks.html REV. B JANUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS843001I-23

FEMTOCLOCKS™ C RYSTAL-TO-3.3V LVPECL/LVCMOS

FREQUENCY SYNTHESIZER

PRELIMINARY

TABLE 9. ORDERING INFORMATION

While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use

or for infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use

in normal commercial and industrial applications. Any other applications such as those requiring high reliability or other extraordinary environmental requirements are not

recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product

for use in life support devices or critical medical instruments.

The aforementioned trademarks, HiPerClockS and FemtoClocks are trademarks of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries.

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