ICST ICS8344BYI, ICS8344BYI-T Datasheet
Integrated
Circuit
Systems, Inc.
ICS8344I
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-L VCMOS FANOUT BUFFER
GENERAL DESCRIPTION
,&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
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
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
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
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
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