ICST ICS8344BY, ICS8344BYT Datasheet

PRELIMINARY

Integrated
Circuit
Systems, Inc.

GENERAL DESCRIPTION

,&6

HiPerClockS™

low impedance L VCMOS outputs are designed to drive 50Ω
series or parallel terminated transmission lines. The effective
fanout can be increased to 48 by utilizing the ability of the
outputs to drive two series terminated lines. Redundant clock
applications can make use of the dual clock input. The dual
clock inputs also facilitate board level testing. ICS8344 is
characterized at full 3.3V , full 2.5V and mixed 3.3V input and

2.5V output operating supply modes.
Guaranteed output and part-to-part skew characteristics

make the ICS8344 ideal for those clock distribution applica­tions demanding well defined performance and repeatability.

The ICS8344 is a low voltage, low skew fanout
buffer and a member of the HiPerClockS™
family of High Performance Clock Solutions from
ICS. The ICS8344 is designed to translate any
differential signal levels to L VCMOS levels. The

ICS8344

LOW SKEW, 1-TO-24

DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER

FEATURES

• 24 LVCMOS outputs, 7Ω typical output impedance

• Output frequency up to 167MHz

• 275ps output skew, 600ps part to part skew

• Translates any differential input signal (PECL, HSTL, L VDS)

to L VCMOS without external bias networks

• Translates any single-ended input signal to L VCMOS with
resistor bias on nCLK input

• Translates and inverts any single-ended input signal to
L VCMOS with resistor bias on CLK input

• Multiple differential clock input pairs for redundant clock
applications

• LVCMOS control inputs

• Multiple output enable pins for disabling unused outputs in

reduced fanout applications

• 3.3V , 2.5V or mixed 3.3V , 2.5V operating supply modes

• 48 lead low-profile QFP(LQFP), 7mm x 7mm x 1.4mm

package body , 0.5mm package lead pitch

• 0°C to 70°C ambient operating temperature

• Industrial temperature versions available upon request

BLOCK DIAGRAM PIN ASSIGNMENT

VDDO

CLK_SEL

CLK0

nCLK0

CLK1

nCLK1

OE1

OE2

OE3

GND

Q14

Q15

48 47 46 45 44 43 42 41 40 39 38 37

1

Q16

2

010

1

Q0 - Q7

O8 - Q15

O16 - Q23

Q17

VDDO

GND

Q18
Q19
Q20
Q21

VDDO

GND

Q22
Q23

3
4
5
6
7
8
9
10
11
12

13 14 15 16 17 18 19 20 21 22 23 24

nCLK1

VDDI

GND

CLK_SEL

Q11

Q12

Q13

ICS8344

VDDI

GND

CLK1

48-Lead LQFP

Y Package

T op View

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.

8344 www.icst.com REV. B FEBRUARY 2, 2001

GND

Q10

CLK0

nCLK0

VDDO

Q9

OE2

OE3

Q8

36
35
34
33
32
31
30
29
28
27
26
25

OE1

Q7
Q6
VDDO
GND
Q5
Q4
Q3
Q2
VDDO
GND
Q1
Q0

1

PRELIMINARY

Integrated
Circuit
Systems, Inc.

TABLE 1. PIN DESCRIPTIONS

rebmuNemaNepyTnoitpircseD

6,5,2,1

21,11,8,7

,82,9,3

54,93,43

,81,41,01,4
64,04,33,72

31LES_KLCtupnInwodlluP

91,51IDDVrewoP.V5.2roV3.3tcennoC.ylppusrewoptupnI
611KLCntupnIpulluP.riaptupnikcolclaitnereffidyradnocesfotupnignitrevnI
711KLCtupnInwodlluP.riaptupnikcolclaitnereffidyradnocesfotupnignitrevni-noN
020KLCntupnIpulluP.riaptupnikcolclaitnereffidyramirpfotupnignitrevnI
120KLCtupnInwodlluP.riaptupnikcolclaitnereffidyramirpfotupnignitrevni-noN

223EOtupnIpulluP

322EOtupnIpulluP

421EOtupnIpulluP

03,92,62,52
63,53,23,13
24,14,83,73
84,74,44,34

91Q,81Q,71Q,61Q
32Q,22Q,12Q,02Q

ODDVrewoP.V5.2roV3.3tcennoC.ylppusrewoptuptuO

DNGrewoP.dnuorgottcennoC.dnuorgylppusrewoP

3Q,2Q,1Q,0Q
7Q,6Q,5Q,4Q

11Q,01Q,9Q,8Q

51Q,41Q,31Q,21Q

tuptuO7.stuptuo32Qurht51Q Ω .ecnadepmituptuolacipyt

tuptuO7.stuptuo7Qurht0Q Ω .ecnadepmituptuolacipyt

tuptuO7.stuptuo51Qurht8Q Ω .ecnadepmituptuolacipyt

ICS8344

LOW SKEW, 1-TO-24

DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER

,1KLCdna0KLCn,0KLCneewtebstceleS.tupnitceleskcolC

.tuptuoehtslortnoctahtriaplaitnereffidehtsa1KLCn

stuptuofognilbasiddnagnilbaneslortnoC.elbanetuptuO

.32Qurht61Q

stuptuofognilbasiddnagnilbaneslortnoC.elbanetuptuO

.51Qurht8Q

stuptuofognilbasiddnagnilbaneslortnoC.elbanetuptuO

.7Qurht0Q

TABLE 2. PIN CHARACTERISTICS

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

,0KLCn,0KLC

NIC

DPC

PULLUPRrotsiseRpulluPtupnI 15KΩ

NWODLLUPRrotsiseRnwodlluPtupnI 15KΩ

TUORecnadepmItuptuO 7

8344 www.icst.com REV. B FEBRUARY 2, 2001

tupnI

ecnaticapaC

)tuptuorep(

1KLCn,1KLC

,LES_KLC

3EO,2EO,1EO

V564.3=ODDV,IDDVFp

ecnaticapaCnoitapissiDrewoP

V526.2

2

=ODDV,V564.3=IDDV

V526.2=ODDV,IDDVFp

Fp

Fp

Fp

Ω

PRELIMINARY

Integrated
Circuit
Systems, Inc.

TABLE 3A. OUTPUT ENABLE FUNCTION TABLE

1knaB2knaB3knaB

tupnItuptuOtupnItuptuOtupnItuptuO

1EO7Q-0Q2EO51Q-8Q3EO32Q-61Q

0Z-iH0Z-iH0 Z-iH

1evitcA1evitcA1 evitcA

TABLE 3B. CLOCK SELECT FUNCTION TABLE

tupnIlortnoCkcolC

LES_KLC0KLCn,0KLC1KLCn,1KLC

0detceleSdetceles-eD

1detceles-eDdetceleS

ICS8344

LOW SKEW, 1-TO-24

DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER

TABLE 3C. CLOCK INPUTS FUNCTION TABLE

stupnIstuptuO

3EO,2EO,1EOKLCKLCn32Qurht0Q
10 1WOLdednEelgniSotlaitnereffiDgnitrevnInoN
110 HGIHdednEelgniSotlaitnereffiDgnitrevnInoN
10 1ETON;desaiBWOLlaitnereffiDotdednEelgniSgnitrevnInoN
11 1ETON;desaiBHGIHlaitnereffiDotdednEelgniSgnitrevnInoN
11ETON;desaiB0HGIHlaitnereffiDotdednEelgniSgnitrevnI
11ETON;desaiB1WOLlaitnereffiDotdednEelgniSgnitrevnI

.2/IDDV

edoMtuptuOottupnIytiraloP

stestupnidesaibehttaegatlovehT.desaibebstupnilaitnereffidehtfoenotahtseriuqeresutupnidedneelgniS:1ETON

otrotsiserasikrowtensaibtupnidednemmocerehtsleveltupniSOMCVLroF.tupnidedneelgnisehtroftniophctiwseht

1.0adnadnuorgoteulavlauqeforotsisera,IDDVµ sitniophctiwsgnitluserehT.dnuorgottupniehtmorfroticapacF

8344 www.icst.com REV. B FEBRUARY 2, 2001

3

PRELIMINARY

Integrated

Circuit

Systems, Inc.

LOW SKEW, 1-TO-24

ICS8344

DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER

ABSOLUTE MAXIMUM RATINGS

Supply Voltage 4.6V
Inputs -0.5V to VDD + 0.5V

Outputs -0.5V to VDDO + 0.5V
Ambient Operating T emperature 0°C to 70°C
Storage T emperature -65°C to 150°C

Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings
are stress specifications only and functional operation of product at these condition or any conditions beyond those listed

DC Characteristics

in the
periods may affect product reliability .

TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDDI = VDDO = 3.3V±5%, TA = 0°C TO 70°C

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

IDDVegatloVylppuSrewoPtupnI 531.33.3564.3V
ODDVegatloVylppuSrewoPtuptuO 573.25.2526.2V

IDDItnerruCylppuSrewoPtnecseiuQ

or

AC Characteristics

is not implied. Exposure to absolute maximum rating conditions for extended

V564.3=HIV=IDDV

V0=LIV

021Am

TABLE 4B. DIFFERENTIAL DC CHARACTERISTICS, VDDI = VDDO = 3.3V±5%, TA = 0°C TO 70°C

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

HIItnerruChgiHtupnI

LIItnerruCwoLtupnI

1KLCn,0KLCn 5Aµ

1KLC,0KLC 051Aµ

1KLCn,0KLCn051-Aµ

1KLC,0KLC5-Aµ

.elbatscitsiretcarahCCAniRMCVdnaPPVees,sleveltupnixKLCn,xKLCroF:ETON

TABLE 4C. LVCMOS DC CHARACTERISTICS, VDDI = VDDO = 3.3V±5%, TA = 0°C TO 70°C

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

HIVegatloVhgiHtupnI

LIVegatloVwoLtupnI

HIItnerruChgiHtupnI

LIItnerruCwoLtupnI

HOVegatloVhgiHtuptuO

LOVegatloVwoLtuptuO

,LES_KLC

3EO,2EO,1EO

,LES_KLC

3EO,2EO,1EO
3EO,2EO,1EOV564.3=NIV=IDDV5Aµ

LES_KLCV564.3=NIV=IDDV051Aµ

3EO,2EO,1EOV0=NIV,564.3=IDDV051-Aµ

LES_KLC0=NIV,564.3=IDDV5-Aµ

V564.3=IDDV28.3V

V531.3=IDDV3.0-8.0V

V531.3=ODDV=IDDV

Am63-=HOI

V531.3=ODDV=IDDV

Am63=LOI

6.2V

6.0V

8344 www.icst.com REV. B FEBRUARY 2, 2001

4

PRELIMINARY

Integrated

Circuit

Systems, Inc.

LOW SKEW, 1-TO-24

ICS8344

DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER

TABLE 5A. AC ELECTRICAL CHARACTERISTICS, VDDI = VDDO = 3.3V±5%, TA = 0°C TO 70°C

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

XAMfycneuqerFtupnImumixaM 761zHM

PPVegatloVtupnIkaeP-ot-kaePzHM761=f3.03.1V

RMCVegatloVtupnIedoMnommoCzHM761=f9.02V

HLpthgiH-ot-woL,yaleDnoitagaporPzHM0 ≤ f ≤ zHM7616.23.4sn

LHptwoL-ot-hgiH,yaleDnoitagaporPzHM0 ≤ f ≤ zHM7614.23.4sn

)b(kst2ETON;wekSknaB

)o(kst3ETON;wekStuptuO

)pp(kst4ETON;wekStraP-ot-traP

Rt5ETON;emiTesiRtuptuO%07ot%030020001sp
Ft5ETON;emiTllaFtuptuO%07ot%030020001sp

WPthtdiWesluPtuptuO

NEt5ETON;emiTelbanEtuptuOzHM7.66=f5sn

SIDt5ETON;emITelbasiDtuptuOzHM7.66=f4sn

05htiwdetanimretstuptuollA Ω .2/ODDVot

.snoitidnocdaollauqehtiw

zHM0 ≤ f ≤ zHM761

2/ODDV

2/ODDV

2/ODDV

zHM761=f53.25.256.3sn

foegdegnisirehtnoderusaeM

foegdegnisirehtnoderusaeM

foegdegnisirehtnoderusaeM

-2/ELCYCt

56.0-

.esiwrehtodetonsselnunimPPVdnazHM761taderusaemsretemarapllA:1ETON

.noitcudorpnidetsettoN.noitaziretcarahcybdeetnaraugerasretemarapesehT:5ETON

2/ELCYCt

.snoitidnocdaollauqehtiwdnasegatlovemasehttastuptuofoknabanihtiwwekssadenifeD:2ETON

segatlovylppusemasehttagnitareposecivedtnereffidnostuptuotnereffidtaweksehtsadenifeD:4ETON

051sp

572sp

006sp

2/ELCYCt

56.0+

.snoitidnocdaollauqehtiwdnasegatlovylppusemasehttastuptuofosknabssorcawekssadenifeD:3ETON

sn

8344 www.icst.com REV. B FEBRUARY 2, 2001

5