ICST ICS8344AY-01, ICS8344AY-01T Datasheet

Integrated
Circuit
Systems, Inc.

ICS8344-01

LOW SKEW, 1-TO-24

DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER

GENERAL DESCRIPTION

,&6

HiPerClockS™

can accept most standard differential input levels. The
ICS8344-01 is designed to translate any differential signal
levels to L VCMOS levels. The low impedance LVCMOS 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. The clock enable is internally synchro­nized to eliminate runt pulses on the outputs during asyn­chronous assertion/deassertion of the clock enable pin. The
outputs are driven low when disabled. The ICS8344-01 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 ICS8344-01 ideal for those clock distribution
applications demanding well defined performance and
repeatability.

The ICS8344-01 is a low voltage, low skew
fanout buffer and a member of the HiPerClockS™
family of High Performance Clock Solutions from
ICS. The ICS8344-01 has two selectable clock
inputs. The CLK0, nCLK0 and CLK1, nCLK1 pairs

FEATURES

• 24 L VCMOS outputs, 7Ω typical output impedance

• 2 selectable CLKx, nCLKx inputs

• CLK0, nCLK0 and CLK1, nCLK1 pairs can accept the

following input levels: L VDS, LVPECL, L VHSTL, SSTL,
HCSL

• Output frequency up to 250MHz

• Translates any single ended input signal to LVCMOS with

resistor bias on nCLK input

• Synchronous clock enable

• Output skew: 200 ps (maximum)

• Part-to-part skew: 900ps (maximum)

• Bank skew: 85ps (maximum)

• Propagation delay: 5ns (maximum)

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

• 0°C to 70°C ambient operating temperature

• Industrial temperature information available upon request

BLOCK DIAGRAM PIN ASSIGNMENT

GND

V

Q14

CLK_SEL

CLK0

nCLK0

CLK1

nCLK1

CLK_EN

OE

1

0

Q0 - Q7

Q8 - Q15

Q16 - Q23

LE
Q

nD

Q16
Q17

V

DDO

GND

Q18
Q19
Q20
Q21

V

DDO

GND

Q22
Q23

Q15

DDO

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

1
2
3
4
5
6
7
8
9
10
11
12

ICS8344-01

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

nCLK1

VDDGND

CLK_SEL

48-Lead LQFP

7mm x 7mm x 1.4mm

Y Package

Top View

Q13

CLK1

Q12

Q11

VDDGND

GND

Q10

CLK0

nCLK0

V

DDO

Q8

Q9

nc

OE

CLK_EN

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

Q7
Q6
V

DDO

GND
Q5
Q4
Q3
Q2
V

DDO

GND
Q1
Q0

8344AY-01 www.icst.com/products/hiperclocks.html REV. B AUGUST 6, 2001

1

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

91,51V
611KLCntupnIpulluP.tupnikcolcLCEPVLlaitnereffidgnitrevnI
711KLCtupnInwodlluP.tupnikcolcLCEPVLlaitnereffidgnitrevni-noN
020KLCntupnIpulluP.tupnikcolcLCEPVLlaitnereffidgnitrevnI

120KLCtupnInwodlluP.tupnikcolcLCEPVLlaitnereffidgnitrevni-noN

22NE_KLCtupnIpulluP

32EOtupnIpulluP
42cndesunU.tcennocoN

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

pulluP

:ETON

dna

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

V

ODD

DNGrewoP.dnuorgottcennoC.dnuorgylppusrewoP

DD

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

11Q,01Q,9Q,8Q

51Q,41Q,31Q,21Q

tuptuO7.stuptuo32Qurht61Q Ω .ecnadepmituptuolacipyt

rewoP.V5.2roV3.3tcennoC.snipylppustuptuO

rewoP.V5.2roV3.3tcennoC.snipylppusevitisoP

tuptuO7.stuptuo7Qurht0Q Ω .ecnadepmituptuolacipyt

tuptuO7.stuptuo51Qurht8Q Ω .ecnadepmituptuolacipyt

nwodlluP

ICS8344-01

LOW SKEW, 1-TO-24

DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER

,stupniKLCn,1KLCstceles,HGIHnehW.tupnitceleskcolC

.stupni0KLCn,0KLCstceles,WOLnehW

.sslevelecafretniLTTVL/SOMCVL

.stuptuokcolcgnilbasiddnagnilbaneroflortnocgnizinorhcnyS

.slevelecafretniSOMCVL

stuptuofognilbasiddnagnilbaneslortnoC.elbanetuptuO

.32Qurht0Q

.seulavlacipytrof,scitsiretcarahCniP,2elbaTeeS.srotsisertupnilanretniotsrefer

TABLE 2. PIN CHARACTERISTICS

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

,0KLCn,0KLC

C

NI

C

DP

R

PULLUP

R
R

8344AY-01 www.icst.com/products/hiperclocks.html REV. B AUGUST 6, 2001

NWODLLUP

TUO

ecnaticapaCtupnI

)tuptuorep(

rotsiseRpulluPtupnI 15KΩ

rotsiseRnwodlluPtupnI 15KΩ

ecnadepmItuptuO 7

1KLCn,1KLC

,LES-KLC

EO,NE_KLC

ecnaticapaCnoitapissiDrewoP

2

4Fp

4Fp

Fp
Fp
Fp

Ω

Integrated
Circuit
Systems, Inc.

TABLE 3A. OUPUT ENABLE FUNCTION TABLE

1knaB2knaB3knaB

tupnItuptuOtupnItuptuOtupnItuptuO

EO7Q-0QEO51Q-8QEO32Q-61Q

0Z-iH0Z-iH0 Z-iH

1delbanE1delbanE1 delbanE

TABLE 3B. CLOCK SELECT FUNCTION TABLE

tupnIlortnoCkcolC

LES_KLC0KLCn,0KLC1KLCn,1KLC

0detceleSdetceles-eD

1detceles-eDdetceleS

ICS8344-01

LOW SKEW, 1-TO-24

DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER

TABLE 3C. CLOCK INPUT FUNCTION TABLE

stupnIstuptuO

EO1KLC,0KLC1KLCn,0KLCn32Qurht0Q

10 1 WOLdednEelgniSotlaitnereffiDgnitrevnInoN
11 0 HGIHdednEelgniSotlaitnereffiDgnitrevnInoN
10 1ETON;desaiBWOLlaitnereffiDotdednEelgniSgnitrevnInoN
11 1ETON;desaiBHGIHlaitnereffiDotdednEelgniSgnitrevnInoN
11ETON;desaiB0HGIHlaitnereffiDotdednEelgniSgnitrevnI
11ETON;desaiB1WOLlaitnereffiDotdednEelgniSgnitrevnI

.sleveldedneelgnistpeccaottupni

edoMtuptuOottupnIytiraloP

laitnereffidehtgniriwsessucsidhcihw,8erugiF,11egapnonoitcesnoitamrofnInoitacilppAehtotreferesaelP:1ETON

8344AY-01 www.icst.com/products/hiperclocks.html REV. B AUGUST 6, 2001

3

Integrated
Circuit
Systems, Inc.

ICS8344-01

LOW SKEW, 1-TO-24

DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER

Supply Voltage, V

Inputs, V
Outputs, V

DDx

I

O

Package Thermal Impedance, θ
Storage T emperature, T

STG

JA

4.6V

-0.5V to VDD + 0.5V

-0.5V to V

DDO

+ 0.5V

47.9°C/W (0lfpm)

-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. Functional operation of product at these conditions or any conditions beyond those listed in

DC Characteristics

the

or

AC Characteristics

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

periods may affect product reliability .

TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, V

DD

= V

= 3.3V±5%, TA = 0°C TO 70°C

DDO

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

V

DD

V

ODD

I

DD

TABLE 4B. LVCMOS DC CHARACTERISTICS, V

egatloVylppuSevitisoP 531.33.3564.3V

egatloVylppuStuptuO 531.33.3564.3V

tnerruCylppuSrewoPtnecseiuQ 59Am

= V

DD

= 3.3V±5%, TA = 0°C TO 70°C

DDO

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

V

HI

V

LI

I

HI

I

LI

V

HO

V

LO

egatloVhgiHtupnI

EO

egatloVwoLtupnI

EO

tnerruChgiHtupnI

tnerruCwoLtupnI

EO,NE_KLCV

LES_KLCV

EO,NE_KLCV

LES_KLCV

egatloVhgiHtuptuO

egatloVwoLtuptuO

,NE_KLC,LES_KLC

,NE_KLC,LES_KLC

V=

DD

NI

V=

DD

NI

DD

DD

V

V=

DD

ODD

I

HO

V

V=

DD

ODD

I

LO

V564.3=5Aµ
V564.3=051Aµ

V,564.3=

V0=051-Aµ

NI

V,564.3=

V0=5-Aµ

NI

V531.3=

Am63-=

V531.3=

Am63=

28.3V

3.0-8.0V

7.2V

5.0V

TABLE 4C. DIFFERENTIAL DC CHARACTERISTICS, V

DD

= V

= 3.3V±5%, TA = 0°C TO 70°C

DDO

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

I

HI

tnerruChgiHtupnI

1KLC,0KLCV

1KLCn,0KLCnV

1KLCn,0KLCnV

I

LI

V

PP

V

RMC

8344AY-01 www.icst.com/products/hiperclocks.html REV. B AUGUST 6, 2001

tnerruCwoLtupnI

1KLC,0KLCV

egatloVtupnIkaePot-kaeP 3.03.1V

2,1ETON:egatloVtupnIedoMnommoC 9.02V

VsadenifedsiegatlovedomnommoC:2ETON

.

V=

DD

NI

V=

DD

NI

DD

DD

4

V564.3=5Aµ
V564.3=051Aµ

V,V564.3=

V0=051-Aµ

NI

V,V564.3=

V0=5-Aµ

NI

Vsi1KLCn,1KLCdna0KLCn,0KLCrofegatlovtupnimumixameht,snoitacilppadedneelgnisroF:1ETON

DD

.V3.0+

Integrated
Circuit
Systems, Inc.

ICS8344-01

LOW SKEW, 1-TO-24

DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER

TABLE 4D. POWER SUPPLY DC CHARACTERISTICS, V

DD

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

V

DD

V

ODD

I

DD

egatloVylppuSevitisoP 531.33.3564.3V

egatloVylppuStuptuO 573.25.2526.2V

tnerruCylppuSrewoPtnecseiuQ 59Am

TABLE 4E. L VCMOS DC CHARACTERISTICS, VDDI = V

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

V

HI

V

LI

I

HI

I

LI

V

HO

V

LO

egatloVhgiHtupnI

EO

egatloVwoLtupnI

EO

tnerruChgiHtupnI

tnerruCwoLtupnI

EO,NE_KLCV

LES_KLCV

EO,NE_KLCV

LES_KLCV

egatloVhgiHtuptuO

egatloVwoLtuptuO

= 3.3V±5%, V

= 3.3V±5%, V

DD

,NE_KLC,LES_KLC

,NE_KLC,LES_KLC

DD

DD

DD

DD

V

V

I

HO

V

V

I

= 2.5V±5%, TA = 0°C TO 70°C

DDO

= 2.5V±5%, TA = 0°C TO 70°C

DDO

V=

NI

V=

NI

DD

ODD

DD

ODD

LO

V564.3=5Aµ
V564.3=051Aµ

V,564.3=

V0=051-Aµ

NI

V,564.3=

V0=5-Aµ

NI

V531.3=

V573.2=

Am72-=

V531.3=

V573.2=

Am72=

28.3V

3.0-8.0V

9.1V

4.0V

TABLE 4F. DIFFERENTIAL DC CHARACTERISTICS, V

= 3.3V±5%, V

DD

= 2.5V±5%, TA = 0°C TO 70°C

DDO

lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU

I

HI

tnerruChgiHtupnI

1KLC,0KLCV

1KLCn,0KLCn

1KLCn,0KLCnV

I

LI

tnerruCwoLtupnI

1KLC,0KLC

V

PP

V

RMC

8344AY-01 www.icst.com/products/hiperclocks.html REV. B AUGUST 6, 2001

egatloVtupnIkaeP-ot-kaeP 3.03.1V

2,1ETON;egatloVtupnIedoMnommoC 9.02V

.

VsadenifedsiegatlovedomnommoC:2ETON

V=

DD

NI

V=

DD

NI

V

DD

V

NI

V

DD

V

NI

V564.3=5Aµ
V564.3=051Aµ

,V564.3=

V0=

,V564.3=

V0=

051-Aµ

5-Aµ

Vsi1KLCn,1KLCdna0KLCn,0KLCrofegatlovtupnimumixameht,snoitacilppadedneelgnisroF:1ETON

.V3.0

+DD

5