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ICS8344BYI
Datasheet (ICST)
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Datasheet ICS8344BYI, ICS8344BYI-T Datasheet (ICST)

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Page 1
Integrated Circuit Systems, Inc.
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
,&6
HiPerClockS™
can accept most standard differential input levels. The ICS8344I is designed to translate any differential signal lev­els to LVCMOS levels. The 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. ICS8344I 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 ICS8344I ideal for those clock distribution applica­tions demanding well defined performance and repeatability .
The ICS8344I is a low voltage, low skew fanout buffer and a member of the HiPerClockS™ family of High Performance Clock Solutions from ICS. The ICS8344I has two selectable clock in­puts. The CLK0, nCLK0 and CLK1, nCLK1 pairs
FEATURES
• 24 L VCMOS outputs, 7Ω typical output impedance
• 2 selectable differential clock input pairs for redundant clock
applications
• CLKx, nCLKx pair can accept the following differential input levels: L VDS, L VPECL, L VHSTL, SSTL, HCSL
• Maximum output frequency up to 100MHz
• Translates any single-ended input signal to L VCMOS with
resistor bias on nCLK input
• Multiple output enable pins for disabling unused outputs in reduced fanout applications
• Output skew: 275ps (maximum)
• Part-to-part skew: 600ps (maximum)
• Bank skew: 150ps (maximum)
• 3.3V , 2.5V or mixed 3.3V , 2.5V operating supply modes
• -40°C to 85°C ambient operating temperature
BLOCK DIAGRAM PIN ASSIGNMENT
GND
V
Q14
Q15
DDO
CLK_SEL
CLK0
nCLK0
CLK1
nCLK1
OE1
OE2
OE3
Q16
0
1
Q0 - Q7
Q8 - Q15
Q16 - Q23
Q17
VDDO
GND
Q18 Q19 Q20 Q21
V
GND
Q22 Q23
48 47 46 45 44 43 42 41 40 39 38 37
1 2 3 4 5 6 7 8 9
DDO
10 11 12
13 14 15 16 17 18 19 20 21 22 23 24
CLK_SEL
ICS8344I
nCLK1
VDDGND
48-Lead LQFP
7mm x 7mm x 1.4mm package body
Q10
Q11
Q12
Q13
nCLK0
VDDGND
CLK1
Y Package
T op View
GND
OE3
CLK0
V
DDO
Q9
OE2
Q8
36 35 34 33 32 31 30 29 28 27 26 25
OE1
Q7 Q6 V
DDO
GND Q5 Q4 Q3 Q2 V
DDO
GND Q1 Q0
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
1
Page 2
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.tupnikcolclaitnereffidgnitrevnI 711KLCtupnInwodlluP..tupnikcolclaitnereffidgnitrevni-noN 020KLCntupnIpulluP.tupnikcolclaitnereffidgnitrevnI 120KLCtupnInwodlluP..tupnikcolclaitnereffidgnitrevni-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
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
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
.stupni1KLCn,1KLCstceles,HGIHnehW.tupnitceleskcolC
.0KLCn,0KLCstceles,WOLnehW
.slevelecafretniSOMCVL/LTTVL
stuptuofognilbasiddnagnilbaneslortnoC.elbanetuptuO
.32Qurht61Q
stuptuofognilbasiddnagnilbaneslortnoC.elbanetuptuO
.51Qurht8Q
stuptuofognilbasiddnagnilbaneslortnoC.elbanetuptuO
.7Qurht0Q
TABLE 2. PIN CHARACTERISTICS
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
,0KLCn,0KLC
C
NI
C
DP
R
PULLUP
R R
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
NWODLLUP
TUO
tupnI
ecnaticapaC
)tuptuorep(
rotsiseRpulluPtupnI 15KΩ
ecnadepmItuptuO 7
1KLCn,1KLC
,LES_KLC
3EO,2EO,1EO
ecnaticapaCnoitapissiDrewoP
rotsiseRnwodlluPtupnI 15KΩ
2
4Fp
4Fp
02Fp
Ω
Page 3
Integrated Circuit Systems, Inc.
TABLE 3A. OUTPUT ENABLE FUNCTION TABLE
1knaB2knaB3knaB
tupnItuptuOtupnItuptuOtupnItuptuO
1EO7Q-0Q2EO51Q-8Q3EO32Q-61Q
0Z-iH0Z-iH0 Z-iH
1delbanE1delbanE1 delbanE
TABLE 3B. CLOCK SELECT FUNCTION TABLE
tupnIlortnoCkcolC
LES_KLC0KLCn,0KLC1KLCn,1KLC
0detceleSdetceles-eD
1detceles-eDdetceleS
ICS8344I
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
.sleveldedneelgnistpeccaottupni
edoMtuptuOottupnIytiraloP
laitnereffidehtgniriwsessucsidhcihw,8erugiF,31egapnonoitcesnoitamrofnInoitacilppAehtotreferesaelP:1ETON
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
3
Page 4
Integrated Circuit Systems, Inc.
LOW SKEW, 1-TO-24
ICS8344I
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V Inputs, V
I
Outputs, V Package Thermal Impedance, θ
Storage T emperature, T
DD
O
JA
STG
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 the
DC Characteristics
or
AC Characteristics
ods may affect product reliability.
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
is not implied. Exposure to absolute maximum rating conditions for extended peri-
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, V
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
V
ODD
I
DD
TABLE 4B. LVCMOS DC CHARACTERISTICS, V
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
HI
V
LI
I
HI
I
LI
V
HO
V
LO
egatloVylppuSevitisoP 531.33.3564.3V
egatloVylppuStuptuO 531.33.3564.3V
tnerruCylppuSrewoPtnecseiuQ 59Am
= V
DD
egatloVhgiHtupnI
egatloVwoLtupnI
tnerruChgiHtupnI
tnerruCwoLtupnI
,LES_KLC
3EO,2EO,1EO
,LES_KLC
3EO,2EO,1EO 3EO,2EO,1EOV
LES_KLCV
3EO,2EO,1EOV
LES_KLCV
egatloVhgiHtuptuO
egatloVwoLtuptuO
= V
DD
DDO
= 3.3V±5%, TA = -40°C TO 85°C
DDO
= 3.3V±5%, TA = -40°C TO 85°C
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=
NI
V,564.3=
NI
V531.3=
Am63-=
V531.3=
Am63=
28.3V
3.0-8.0V
V0=051-Aµ V0=5-Aµ
6.2V
6.0V
TABLE 4C. DIFFERENTIAL DC CHARACTERISTICS, V
DD
= V
= 3.3V±5%, TA = -40°C TO 85°C
DDO
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
I
HI
I
LI
V
PP
V
RMC
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
tnerruChgiHtupnI
tnerruCwoLtupnI
egatloVtupnIkaeP-ot-kaeP 51.03.1V
1KLCn,0KLCn 5Aµ
1KLC,0KLC 051Aµ
1KLCn,0KLCn051-Aµ
1KLC,0KLC5-Aµ
2,1ETON;egatloVtupnIedoMnommoC 5.0+DNGV
VsiKLCn,KLCrofegatlovtupnimumixameht,snoitacilppadedneelgnisroF:1ETON
.
VsadenifedsiegatlovedomnommoC:2ETON
4
DD
.V3.0+
58.0-V
DD
Page 5
Integrated Circuit Systems, Inc.
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
TABLE 5A. AC CHARACTERISTICS, V
DD
= V
= 3.3V±5%, TA = -40°C TO 85°C
DDO
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
f
XAM
pt
HL
pt
LH
t
)b(ks6,2ETON;wekSknaB 051sp
t
)o(ks6,3ETON;wekStuptuO 572sp
t
)pp(ks6,4ETON;wekStraP-ot-traP 006sp
t
R
t
F
,yaleDnoitagaporP
,yaleDnoitagaporP
ycneuqerFtuptuOmumixaM 001zHM
1ETON;hgiHotwoL
1ETON;woLothgiH
f ≤ zHM0016.23.4sn
f ≤ zHM0014.23.4sn
5ETON;emiTesiRtuptuO%07ot%030030071sp
5ETON;emiTllaFtuptuO%07ot%030030041sp
cdoelcyCytuDtuptuO %04%06%
t
NE
t
SID
5ETON;emiTelbanEtuptuOzHM7.66=f5sn
5ETON;emITelbasiDtuptuOzHM7.66=f4sn
.esiwrehtodetonsselnuzHM001taderusaemsretemarapllA
.2/
VottniopgnissorctupnilaitnerefffidehtmorfderusaeM:1ETON
ODD
.snoitidnocdaollauqehtiwdnasegatlovemasehttastuptuofoknabanihtiwwekssadenifeD:2ETON
.snoitidnocdaollauqehtiwdnaegatlovylppusemasehttastuptuoneewtebwekssadenifeD:3ETON
.2/
VtaderusaeM
ODD
segatlovylppusemasehttagnitareposecivedtnereffidnostuptuoneewtebwekssadenifeD:4ETON
derusaemerastuptuoeht,ecivedhcaenostupnifoepytemasehtgnisU.snoitidnocdaollauqehtiwdna
Vta
.2/
ODD
.noitcudorpnidetsettoN.noitaziretcarahcybdeetnaraugerasretemarapesehT:5ETON
.56dradnatSCEDEJhtiwecnadroccanidenifedsiretemarapsihT:6ETON
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
5
Page 6
Integrated Circuit Systems, Inc.
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
TABLE 4D. POWER SUPPLY DC CHARACTERISTICS, V
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
V
ODD
I
DD
TABLE 4E. L VCMOS DC CHARACTERISTICS, V
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
HI
V
LI
I
HI
I
LI
V
HO
V
LO
egatloVylppuSevitisoP 531.33.3564.3V
egatloVylppuStuptuO 573.25.2526.2V
tnerruCylppuSrewoPtnecseiuQ 59Am
= 3.3V±5%, V
DD
egatloVhgiHtupnI
egatloVwoLtupnI
tnerruChgiHtupnI
tnerruCwoLtupnI
,LES_KLC
3EO,2EO,1EO
,LES_KLC
3EO,2EO,1EO 3EO,2EO,1EOV
LES_KLCV
3EO,2EO,1EOV
LES_KLCV
egatloVhgiHtuptuO
egatloVwoLtuptuO
= 3.3V±5%, V
DD
DD
DD
= 2.5V±5%, TA = -40°C TO 85°C
DDO
= 2.5V±5%, TA = -40°C TO 85°C
DDO
28.3V
V=
DD
NI
V=
DD
NI
V
DD
V
ODD
I
HO
V
DD
V
ODD
I
LO
V564.3=5Aµ V564.3=051Aµ
V,564.3=
V0=051-Aµ
NI
V,564.3=
0=5-Aµ
NI
,V531.3=
V573.2=
2V
Am72-=
,V531.3=
V563.2=
Am72=
3.0-8.0V
36.0V
TABLE 4F. DIFFERENTIAL DC CHARACTERISTICS, V
= 3.3V±5%, V
DD
= 2.5V±5%, TA = -40°C TO 85°C
DDO
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
I
HI
I
LI
V
PP
V
RMC
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
tnerruChgiHtupnI
tnerruCwoLtupnI
egatloVtupnIkaeP-ot-kaeP 51.03.1V
1KLCn,0KLCn 5Aµ
1KLC,0KLC 051Aµ
1KLCn,0KLCn051-Aµ
1KLC,0KLC5-Aµ
2,1ETON;egatloVtupnIedoMnommoC 5.0+DNGV
VsiKLCn,KLCrofegatlovtupnimumixameht,snoitacilppadedneelgnisroF:1ETON
sadenifedsiegatlovedomnommoC:2ETONV
.
6
DD
.V3.0+
58.0-V
DD
Page 7
Integrated Circuit Systems, Inc.
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
TABLE 5B. AC CHARACTERISTICS, V
= 3.3V±5%, V
DD
= 2.5V±5%, TA = -40°C TO 85°C
DDO
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
f
XAM
pt
HL
pt
LH
t
)b(ks6,2ETON;wekSknaB 051sp
t
)o(ks6,3ETON;wekStuptuO 572sp
t
)pp(ks6,4ETON;wekStraP-ot-traP 006sp
t
R
t
F
,yaleDnoitagaporP
,yaleDnoitagaporP
ycneuqerFtuptuOmumixaM 001zHM
1ETON;hgiHotwoL
1ETON;woLothgiH
f ≤ zHM0016.25.4sn
f ≤ zHM0016.25.4sn
5ETON;emiTesiRtuptuO%07ot%030030071sp
5ETON;emiTllaFtuptuO%07ot%030030041sp
cdoelcyCytuDtuptuO %04%06%
t
NE
t
SID
5ETON;emiTelbanEtuptuOzHM7.66=f6sn
5ETON;emITelbasiDtuptuOzHM7.66=f6sn
.esiwrehtodetonsselnuzHM001taderusaemsretemarapllA
.2/
VottniopgnissorctupnilaitnerefffidehtmorfderusaeM:1ETON
ODD
.snoitidnocdaollauqehtiwdnasegatlovemasehttastuptuofoknabanihtiwwekssadenifeD:2ETON
.snoitidnocdaollauqehtiwdnaegatlovylppusemasehttastuptuoneewtebwekssadenifeD:3ETON
.2/
VtaderusaeM
ODD
segatlovylppusemasehttagnitareposecivedtnereffidnostuptuoneewtebwekssadenifeD:4ETON
derusaemerastuptuoeht,ecivedhcaenostupnifoepytemasehtgnisU.snoitidnocdaollauqehtiwdna
Vta
.2/
ODD
.noitcudorpnidetsettoN.noitaziretcarahcybdeetnaraugerasretemarapesehT:5ETON
.56dradnatSCEDEJhtiwecnadroccanidenifedsiretemarapsihT:6ETON
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
7
Page 8
Integrated Circuit Systems, Inc.
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
TABLE 4G. POWER SUPPLY DC CHARACTERISTICS, V
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
V
ODD
I
DD
TABLE 4H. LVCMOS DC CHARACTERISTICS, V
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
HI
V
LI
I
HI
I
LI
V
HO
V
LO
egatloVylppuSevitisoP 573.25.2526.2V
egatloVylppuStuptuO 573.25.2526.2V
tnerruCylppuSrewoPtnecseiuQ 59Am
= V
DD
egatloVhgiHtupnI
egatloVwoLtupnI
tnerruChgiHtupnI
tnerruCwoLtupnI
,LES_KLC
3EO,2EO,1EO
,LES_KLC
3EO,2EO,1EO 3EO,2EO,1EOV
LES_KLCV
3EO,2EO,1EOV
LES_KLCV
egatloVhgiHtuptuO
egatloVwoLtuptuO
= V
DD
DDO
= 2.5V±5%, TA = -40°C TO 85°C
DDO
= 2.5V±5%, TA = -40°C TO 85°C
V=
DD
NI
V=
DD
NI
DD
DD
V
DD
I
HO
V
DD
I
LO
V526.2=5Aµ V526.2=051Aµ
V,526.2=
NI
V,526.2=
NI
Am72-=
Am72=
29.2V
3.0-8.0V
V0=051-Aµ V0=5-Aµ
V573.2=ODDV=
V573.2=ODDV=
2V
6.0V
TABLE 4I. DIFFERENTIAL DC CHARACTERISTICS, V
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
I
HI
I
LI
V
PP
V
RMC
tnerruChgiHtupnI
tnerruCwoLtupnI
1KLC,0KLC 051Aµ
1KLC,0KLC5-Aµ
egatloVtupnIkaeP-ot-kaeP 51.03.1V
= V
DD
= 2.5V±5%, TA = -40°C TO 85°C
DDO
1KLCn,0KLCn 5Aµ
1KLCn,0KLCn051-Aµ
2,1ETON;egatloVtupnIedoMnommoC 5.0+DNGV
VsiKLCn,KLCrofegatlovtupnimumixameht,snoitacilppadedneelgnisroF:1ETON
VsadenifedsiegatlovedomnommoC:2ETON
.
DD
.V3.0+
58.0-V
DD
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
8
Page 9
Integrated Circuit Systems, Inc.
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
TABLE 5C. AC CHARACTERISTICS, V
= V
DD
= 2.5V±5%, TA = -40°C TO 85°C
DDO
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
f
XAM
pt
HL
pt
LH
t
)b(ks6,2ETON;wekSknaB 051sp
t
)o(ks6,3ETON;wekStuptuO 572sp
t
)pp(ks6,4ETON;wekStraP-ot-traP 006sp
t
R
t
F
,yaleDnoitagaporP
,yaleDnoitagaporP
ycneuqerFtuptuOmumixaM 001zHM
1ETON;hgiHotwoL
1ETON;woLothgiH
f ≤ zHM0017.23.4sn
f ≤ zHM0017.23.4sn
5ETON;emiTesiRtuptuO%07ot%030030071sp
5ETON;emiTllaFtuptuO%07ot%030030041sp
cdoelcyCytuDtuptuO %04%06%
t
NE
t
SID
5ETON;emiTelbanEtuptuOzHM7.66=f6sn
5ETON;emITelbasiDtuptuOzHM7.66=f6sn
.esiwrehtodetonsselnuzHM001taderusaemsretemarapllA
.2/
VottniopgnissorctupnilaitnerefffidehtmorfderusaeM:1ETON
ODD
.snoitidnocdaollauqehtiwdnasegatlovemasehttastuptuofoknabanihtiwwekssadenifeD:2ETON
.snoitidnocdaollauqehtiwdnaegatlovylppusemasehttastuptuoneewtebwekssadenifeD:3ETON
.2/
VtaderusaeM
ODD
segatlovylppusemasehttagnitareposecivedtnereffidnostuptuoneewtebwekssadenifeD:4ETON
derusaemerastuptuoeht,ecivedhcaenostupnifoepytemasehtgnisU.snoitidnocdaollauqehtiwdna
Vta
.2/
ODD
.noitcudorpnidetsettoN.noitaziretcarahcybdeetnaraugerasretemarapesehT:5ETON
.56dradnatSCEDEJhtiwecnadroccanidenifedsiretemarapsihT:6ETON
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
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Integrated Circuit Systems, Inc.
PARAMETER MEASUREMENT INFORMATION
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
V
V
DD
DDO
LVCMOS
VDD = +1.65V V
= +1.65V
DDO
GND = -1.65V
V
DDO
SCOPE
Qx
FIGURE 1A - 3.3V OUTPUT LOAD TEST CIRCUIT
SCOPE
LVCMOS
V
= +1.25V
DDO
GND = -1.25V
FIGURE 1B - 2.5V OUTPUT LOAD TEST CIRCUIT
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
10
Qx
Page 11
Integrated Circuit Systems, Inc.
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
V
V
DD
DDO
LVCMOS
VDD = +2.05V V
= +1.25V
DDO
GND = -1.25V
Qx
FIGURE 1C - 3.3V/2.5V OUTPUT LOAD TEST CIRCUIT
V
DD
SCOPE
CLK0, CLK1
nCLK0, nCLK1
GND
Qx
Qy
VPP
Cross Points
FIGURE 2 - DIFFERENTIAL INPUT LEVEL
tsk(o)
FIGURE 3 - O UTPUT SKEW
V
CMR
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
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Integrated Circuit Systems, Inc.
P ART 1
Qx
P ART 2
Qy
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
tsk(pp)
FIGURE 4 - PART-TO-PART SKEW
Clock Inputs and Outputs
CLK0, CLK1
nCLK0, nCLK1
Q0 - Q23
70%
30%
trise tfall
FIGURE 5 - INPUT AND OUTPUT RISE AND FALL TIME
V
/2
DDOx
tp
LH
tp
HL
FIGURE 6 - PROPAGATION DELAY
70%
30%
V
SWING
CLK0, CLK1,
Q0 - Q23
nCLK0, nCLK1
Pulse Width
t
PERIOD
t
odc =
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
PW
t
PERIOD
FIGURE 7 - odc & t
12
PERIOD
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Integrated Circuit Systems, Inc.
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
APPLICA TION INFORMATION
WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS
ICS8344I
Figure 8
generated by the bias resistors R1, R2 and C1. This bias circuit should be located as close as possible to the input pin. The ratio of R1 and R2 might need to be adjusted to position the V_REF in the center of the input voltage swing. For example, if the input clock swing is only 2.5V and V
shows how the differential input can be wired to accept single ended levels. The reference voltage V_REF ~ VDD/2 is
= 3.3V , V_REF should be 1.25V and R2/R1 = 0.609.
DD
CLK_IN
CLK_IN
C1
C1
0.1uF
0.1uF
R1 1K
R1 1K
V_REF
V_REF
R2 1K
R2 1K
VDD
VCC
+
+
-
-
FIGURE 8 - SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT
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Integrated Circuit Systems, Inc.
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
RELIABILITY INFORMATION
TABLE 7. θ
TRANSISTOR COUNT
The transistor count for ICS8344I is: 1,449
VS
. AIR FLOW TABLE
JA
q
Single-Layer PCB, JEDEC Standard Test Boards 67.8°C/W 55.9°C/W 50.1°C/W Multi-Layer PCB, JEDEC Standard Test Boards 47.9°C/W 42.1°C/W 39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
by V elocity (Linear Feet per Minute)
JA
0 200 500
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
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Integrated Circuit Systems, Inc.
PACKAGE OUTLINE - Y SUFFIX
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
TABLE 8. PACKAGE DIMENSIONS
NOITAIRAVCEDEJ
LOBMYS
N A
1A
2A b c D
1D
2D E
1E
2E e L
q
ccc
Reference Document: JEDEC Publication 95, MS-026
MUMINIMLANIMONMUMIXAM
84
50.051.0
53.104.154.1
71.022.072.0
90.002.0
54.006.057.0
°
0
SRETEMILLIMNISNOISNEMIDLLA
CCB
06.1
CISAB00.9 CISAB00.7
05.5 CISAB00.9 CISAB00.7
05.5
CISAB5.0
7
°
80.0
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
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Integrated Circuit Systems, Inc.
TABLE 9. ORDERING INFORMATION
rebmuNredrO/traPgnikraMegakcaPtnuoCerutarepmeT
IYB4438SCIIYB4438SCIPFQLdaeL84yartrep052C°58otC°04-
T-IYB4438SCIIYB4438SCIleeRdnaepaTnoPFQLdaeL840001C°58otC°04-
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
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.
8344BYI www.icst.com/products/hiperclocks.html REV. A AUGUST 9, 2001
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