8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
1
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
GENERAL DESCRIPTION
The ICS8312I is a low skew, 1-to-12 LVCMOS /
LVTTL Fanout Buffer and a member of the
HiPerClockS™ family of High Performance Clock
Solutions from ICS. The ICS8312I single ended
clock input accepts LVCMOS or LVTTL input lev-
els. The low impedance LVCMOS outputs are designed to
drive 50Ω series or parallel terminated transmission lines. The
effective fanout can be increased from 12 to 24 by utilizing
the ability of the outputs to drive two series terminated lines.
The ICS8312I is characterized at full 3.3V, 2.5V, and 1.8V, or
mixed 3.3V core/2.5V, 3.3V core/1.8V and 2.5V core/1.8V out-
put operating supply modes. Guaranteed output and part-to-
part skew characteristics along with the 1.8V output capa-
bilities makes the ICS8312I ideal for high performance, single
ended applications that also require a limited output voltage.
BLOCK DIAGRAM PIN ASSIGNMENT
FEATURES
•12 LVCMOS / LVTTL outputs
•LVCMOS / LVTTL clock input
•Maximum output frequency: 250MHz
•Output skew: 160ps (maximum)
•Operating supply modes: Core/Output
3.3V/3.3V
2.5V/2.5V
1.8V/1.8V
3.3V/2.5V
3.3V/1.8V
2.5V/1.8V
•-40°C to 85°C ambient operating temperature
HiPerClockS™
ICS
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
Q4
VDDO
Q5
GND
Q6
VDDO
Q7
GND
GND
VDD
CLK_EN
CLK
GND
OE
VDD
GND
GND
Q8
VDDO
Q9
GND
Q10
VDDO
Q11
GND
Q3
VDDO
Q2
GND
Q1
VDDO
Q0
ICS8312I
32-Lead LQFP
7mm x 7mm x 1.4mm body package
Y Pacakge
Top View
Q0:Q11
CLK_EN
CLK
OE
nD
Q
LE
12
8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
2
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
TABLE 1. PIN DESCRIPTIONS
TABLE 2. PIN CHARACTERISTICS
TABLE 3A. OUTPUT ENABLE AND CLOCK ENABLE FUNCTION TABLE
TABLE 3B. CLOCK INPUT FUNCTION TABLE
rebmuNemaNepyTnoitpircseD
,21,8,5,1
,12,71,61
92,52
DNGrewoP.dnuorgylppusrewoP
7,2V
DD
rewoP.snipylppuseroC
3NE_KLCtupnIpulluP .stuptuokcolcgnilbasiddnagnilbaneroflortnocsuonorhcnyS
.slevelecafre
tniLTTVL/SOMCVL
4KLCtupnInwodlluP.slevelecafretniLTTVL/SOMCVL.tupnikcolC
6EOtupnIpulluP stuptuofognilbasiddnagn
ilbaneslortnoC.elbanetuptuO
.slevelecafretniLTTVL/SOMCVL.11Qurht0Q
,51,31,11,9
,22,02,81
,82,62,42
23,03
,8
Q,9Q,01Q,11Q
,5Q,6Q,7Q
,2Q,3Q,4Q
0Q,1Q
tuptuO .slevelecafretniLTTVL/SOMCVL.stuptuo11Qurht0Q
,91,41,01
13,72,
32 V
ODD
rewoP.snipylppustuptuO
:ETON
pulluP
dna
nwodlluP
.seulavlacipytrof,scitsiretcarahCniP,2elbaTeeS.srotsisertupnilanretniotrefer
stupnIstuptuO
EONE_KLCKLC11Q:0Q
110 WOL
111 HGIH
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
C
NI
ecnaticapaCtupnI 4Fp
C
DP
ecnaticapaCnoitapissiDrewoP
)tuptuorep(
V
ODD
V564.3=91Fp
V
ODD
V526.2=81Fp
V
ODD
V2=61Fp
R
PULLUP
rotsiseRpulluPtupnI 15KΩ
R
NWODLLUP
rotsiseRnwodlluPtupnI 15KΩ
R
TUO
ecnadepmItuptuO
V
ODD
%5±V3.3=7
Ω
V
ODD
%5±V5.2=7
Ω
V
ODD
V2.0±V8.1=01Ω
stupnIlortnoCtuptuO
EONE_KLC11Q:0Q
0X Z-iH
10 WOL
11 tupniKLCswolloF
8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
3
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDO = 3.3V±5%, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
egatloVylppuSeroC 531.33.3564.3V
V
ODD
egatloVylppuStuptuO 531.33.3564.3V
I
DD
tnerruCylppuSrewoP 01Aµ
I
ODD
tnerruCylppuStuptuO 01Aµ
TABLE 4B. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDO = 2.5V±5%, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
egatloVylppuSeroC 573.25.2526.2V
V
ODD
egatloVylppuStuptuO 573.25.2526.2V
I
DD
tnerruCylppuSrewoP 01Aµ
I
ODD
tnerruCylppuStuptuO 01Aµ
TABLE 4C. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDO = 1.8V±0.2V, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
egatloVylppuSeroC 6.18.10.2V
V
ODD
egatloVylppuStuptuO 6.18.10.2V
I
DD
tnerruCylppuSrewoP 01Aµ
I
ODD
tnerruCylppuStuptuO 01Aµ
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
DD 4.6V
Inputs, VI-0.5V to VDD + 0.5 V
Outputs, VO-0.5V to VDDO + 0.5V
Package Thermal Impedance, θJA 47.9°C/W (0 lfpm)
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 4D. POWER SUPPLY DC CHARACTERISTICS, VDD = 3.3V±5%, VDDO = 2.5V±5%, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
egatloVylppuSeroC 531.33.3564.3V
V
ODD
egatloVylppuStuptuO 573.25.2526.2V
I
DD
tnerruCylppuSrewoP 01Aµ
I
ODD
tnerruCylppuStuptuO 01Aµ
TABLE 4E. POWER SUPPLY DC CHARACTERISTICS, VDD = 3.3V±5%, VDDO = 1.8V±0.2V, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
egatloVylppuSeroC 531.33.3564.3V
V
ODD
egatloVylppuStuptuO 6.18.10.2V
I
DD
tnerruCylppuSrewoP 01Aµ
I
ODD
tnerruCylppuStuptuO 01Aµ
TABLE 4F. POWER SUPPLY DC CHARACTERISTICS, VDD = 2.5V±5%, VDDO = 1.8V±0.2V, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
egatloVylppuSeroC 573.25.2526.2V
V
ODD
egatloVylppuStuptuO 6.18.10.2V
I
DD
tnerruCylppuSrewoP 01Aµ
I
ODD
tnerruCylppuStuptuO 01Aµ
8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
4
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
TABLE 4F. LVCMOS/LVTTL DC CHARACTERISTICS, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
HI
egatloVhgiHtupnI
KLC
V
DD
%5±V3.3=2V
DD
3.0+V
V
DD
%5±V5.2=7.1V
DD
3.0+V
V
DD
V2.0±V8.1=V*56.0
DD
V
DD
3.0+V
EO,NE_KLC
V
DD
%5±V3.3=2V
DD
3.0+V
V
DD
%5±V5.2=7.1V
DD
3.0+V
V
DD
V2.0±V8.1=V*56.0
DD
V
DD
3.0+V
V
LI
egatloVwoLtupnI
KLC
V
DD
%5±V3.3=3.0-3.1V
V
DD
%5±V5.2=3.0-7.0V
V
DD
V2.0±V8.1=3.0-V*53.0
DD
V
EO,NE_KLC
V
DD
%5±V3.3=3.0-3.1V
V
DD
%5±V5.2=3.0-7.0V
V
DD
V2.0±V8.1=3.0-V*53.0
DD
V
I
HI
tnerruChgiHtupnI
KLC
V
DD
%5±V3.3=051Aµ
V
DD
%5±V5.2=051Aµ
V
DD
V2.0±V8.1=051Aµ
EO,NE_KLC
V
DD
%5±V3.3=5Aµ
V
DD
%5±V5.2=5Aµ
V
DD
V2.0±V8.1=5Aµ
I
LI
tnerruCwoLtupnI
KLC
V
DD
%5±V3.3=5-Aµ
V
DD
%5±V5.2=5-Aµ
V
DD
V2.0±V8.1=5-Aµ
EO,NE_KLC
V
DD
%5±V3.3=051-Aµ
V
DD
%5±V5.2=051-Aµ
V
DD
V2.0±V8.1=051-Aµ
V
HO
egatloVhgiHtuptuO
V
ODD
1ETON;%5±V3.3=6.2V
V
ODD
I;%5±V5.2=
HO
Am1-=2 V
V
ODD
1ETON;%5±V5.2=8.1V
V
ODD
I;V2.0±V8.1=
HO
Au001-=V
DD
2.0-V
V
ODD
1ETON;V2.0±V8.1=V
DD
3.0-V
V
LO
egatloVwoLtuptuO
V
ODD
1ETON;%5±V3.3=5.0V
V
ODD
I;%5±V5.2=
LO
Am1=4.0V
V
ODD
1ETON;%5±V5.2=54.0V
V
ODD
I;V2.0±V8.1=
LO
Au001=2.0V
V
ODD
1ETON;V2.0±V8.1=53.0V
05htiwdetanimretstuptuO:1ETON ΩVot
ODD
.smargaid"tiucriCtseTdaoL",noitcestnemerusaeMretemaraPeeS.2/
8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
5
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
TABLE 5B. AC CHARACTERISTICS, VDD = VDDO = 2.5V±5%, TA = -40°C TO 85°C
TABLE 5A. AC CHARACTERISTICS, VDD = VDDO = 3.3V±5%, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
f
XAM
ycneuqerFtuptuO 052zHM
pt
HL
1ETON;hgiHotwoLyaleDnoitagaporPf≤zHM0522.10.27.2sn
t
)o(ks5,2ETON;wekStuptuO 051sp
t
)pp(ks5,3ETON;wekStraP-ot-traP 058sp
t
R
/t
F
4ETON;emiTesiRtuptuO%08ot%02571008sp
cdoelcyCytuDtuptuOf≤zHM0515455%
ftaderusaemsretemarapllA
XAM
.esiwrehtodetonsselnu
.5hguorht1setoNrofwolebdetsilC5elbaTeeS
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
f
XAM
ycneuqerFtuptuO 052zHM
pt
HL
1ETON;hgiHotwoLyaleDnoitagaporPf≤zHM05252.14.25.3sn
t
)o(ks5,2ETON;wekStuptuO 551sp
t
)pp(ks5,3ETON;wekStraP-ot-traP 1.1sn
t
R
/t
F
4ETON;emiTesiRtuptuO%08ot%02002008sp
cdoelcyCytuDtuptuOf≤zHM0515455%
.esiwrehtodetonsselnuXAMftaderusaemsretemar
apllA
hguorht1setoNrofwolebdetsilC5elbaTeeS
TABLE 5C. AC CHARACTERISTICS, VDD = VDDO = 1.8V±0.2V, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
f
XAM
ycneuqerFtuptuO 002zHM
pt
HL
1ETON;hgiHotwoLyaleDnoitagaporPf≤zHM0026.13.39.4sn
t
)o(ks5,2ETON;wekStuptuO 061sp
t
)pp(ks5,3ETON;wekStraP-ot-traP 4.2sn
t
R
/t
F
4ETON;emiTesiRtuptuO%08ot%02571578sp
cdoelcyCytuDtuptuOf≤zHM0015455%
ftaderusaemsretemarapllA
XAM
.esiwrehtodetonsselnu
VmorfderusaeM:1ETON
DD
Vottupniehtfo2/
ODD
.tuptuoehtfo2/
VtaderusaeM.snoitidnocdaollauqehtiwdnaegatlovylppusemasehttastuptuoneewtebwekssadenifeD
:2ETON
ODD
.2/
lauqehtiwdnasegatlovylppusemasehttagnitareposecivedtnereffidnostuptuoneewtebweksehtsadenifeD:3ETON
Vtaderusaemerastuptuoeht,ecivedhcaenostupnifoepytemasehtgnisU.snoitidnocdaol
ODD
.2/
.noitcudorpnidetsettoN.noitaziretcarahcybdeetnaraugerasretemarapesehT:4ETON
.56dradnatSCEDEJhtiwecn
adroccanidenifedsiretemarapsihT:5ETON
8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
6
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
TABLE 5D. AC CHARACTERISTICS, VDD = 3.3V±5%, VDDO = 2.5V±5%, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
f
XAM
ycneuqerFtuptuO 052zHM
pt
HL
1ETON;hgiHotwoLyaleDnoitagaporPf≤zHM0525.11.28.2sn
t
)o(ks5,2ETON;wekStuptuO 051sp
t
)pp(ks5,3ETON;wekStraP-ot-traP 1sn
t
R
/t
F
4ETON;emiTesiRtuptuO%08ot%02002008sp
cdoelcyCytuDtuptuOf≤zHM0515455%
.esiwrehtodetonsselnuXAMftaderusaemsretemar
apllA
.5hguorht1setoNrofwolebdetsilF5elbaTeeS
TABLE 5E. AC CHARACTERISTICS, VDD = 3.3V±5%, VDDO = 1.8V±0.2V, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
f
XAM
ycneuqerFtuptuO 002zHM
pt
HL
1ETON;hgiHotwoLyaleDnoitagaporPf≤zHM0025.15.25.3sn
t
)o(ks5,2ETON;wekStuptuO 051sp
t
)pp(ks5,3ETON;wekStraP-ot-traP 4.1sn
t
R
/t
F
4ETON;emiTesiRtuptuO%08ot%02002008sp
cdoelcyCytuDtuptuOf≤zHM0015455%
.esiwrehtodetonsselnuXAMftaderusaemsretemar
apllA
hguorht1setoNrofwolebdetsilF5elbaTeeS
TABLE 5F. AC CHARACTERISTICS, VDD = 2.5V±5%, VDDO = 1.8V±0.2V, TA = -40°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
f
XAM
ycneuqerFtuptuO 002zHM
pt
HL
1ETON;hgiHotwoLyaleDnoitagaporPf≤zHM0024.17.29.3sn
t
)o(ks5,2ETON;wekStuptuO 061sp
t
)pp(ks5,3ETON;wekStraP-ot-traP 6.1sn
t
R
/t
F
4ETON;emiTesiRtuptuO%08ot%02002008sp
cdoelcyCytuDtuptuOf≤zHM0015455%
ftaderusaemsretemarapllA
XAM
.esiwrehtodetonsselnu
VmorfderusaeM:1ETON
DD
Vottupniehtfo2/
ODD
.tuptuoehtfo2/
VtaderusaeM.snoitidnocdaollauqehtiwdnaegatlovylppusemasehttastuptuoneewtebwekssadenifeD
:2ETON
ODD
.2/
lauqehtiwdnasegatlovylppusemasehttagnitareposecivedtnereffidnostuptuoneewtebweksehtsadenifeD:3ETON
Vtaderusaemerastuptuoeht,ecivedhcaenostupnifoepytemasehtgnisU.snoitidnocdaol
ODD
.2/
.noitcudorpnidetsettoN.noitaziretcarahcybdeetnaraugerasretemarapesehT:4ETON
.56dradnatSCEDEJhtiwecn
adroccanidenifedsiretemarapsihT:5ETON
8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
7
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
PARAMETER MEASUREMENT INFORMATION
SCOPE
Qx
LVCMOS
1.8V CORE/1.8V OUTPUT LOAD AC TEST CIRCUIT
2.4±0.9V
VDDO
-0.9V±0.1V
VDD
0.9V±0.1V
SCOPE
Qx
LVCMOS
2.5V CORE/2.5V OUTPUT LOAD AC TEST CIRCUIT
2.05V±5%
VDDO
-1.25V±5%
VDD
1.25V±5%
3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT
SCOPE
Qx
LVCMOS
1.65V±5%
-1.165V±5%
3.3V CORE/2.5V OUTPUT LOAD AC TEST CIRCUIT
3.3V CORE/1.8V OUTPUT LOAD AC TEST CIRCUIT 2.5 CORE/1.8V OUTPUT LOAD AC TEST CIRCUIT
SCOPE
Qx
LVCMOS
1.25V±5%
-1.25V±5%
SCOPE
Qx
LVCMOS
0.9V ± 0.1V
-0.9V ± 0.1V
SCOPE
Qx
LVCMOS
2.05V±5%
VDDO
-0.9V±0.1V
VDD
0.9V±0.1V
VDD,
VDDO
GND
VDD,
VDDO
GND
VDD,
VDDO
GND
GND
GND GND
8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
8
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
Clock
Outputs
20%
80% 80%
20%
t
R
t
F
Pulse Width
tPERIOD
tPW
tPERIOD
odc =
V
DDO
2
Q0:Q11
t
PD
V
DD
2
V
DDO
2
CLK
Q0:Q11
OUTPUT RISE/FALL TIME
PART-TO-PART SKEWOUTPUT SKEW
PROPAGATION DELAY
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
t
sk(o)
V
DDO
2
V
DDO
2
Qy
Qx
t
sk(pp)
V
DDO
2
V
DDO
2
Qy
Qx
Part 1
Part 2
8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
9
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
RELIABILITY INFORMATION
TRANSISTOR COUNT
The transistor count for ICS8312I is: 339
TABLE 6. θJAVS. AIR FLOW TABLE
θθ
θθ
θJA by Velocity (Linear Feet per Minute)
0 200 500
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.
8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
10
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
PACKAGE OUTLINE - Y SUFFIX
TABLE 7. PACKAGE DIMENSIONS
NOITAIRAVCEDEJ
SRETEMILLIMNISNOISNEMIDLLA
LOBMYS
ABB
MUMINIMLANIMONMUMIXAM
N23
A----06.1
1A 50.0--51.0
2A 53.104.154.1
b03.073.054.0
c90.0--02.0
DCISAB00.9
1D CISAB00.7
2D .feR06.5
ECISAB00.9
1E CISAB00.7
2E .feR06.5
eCISAB08.0
L54.006.057.
0
θθ
θ
θθ 0
°
-- 7
°
ccc ----01.0
Reference Document: JEDEC Publication 95, MS-026
8312AYI http://www.icst.com/products/hiperclocks.html REV. A OCTOBER 23, 2003
11
Integrated
Circuit
Systems, Inc.
ICS8312I
LOW SKEW, 1-TO-12
LVCMOS / LVTTL FANOUT BUFFER
TABLE 8. 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.
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IYA2138SCIIYA2138SCIPFQLdaeL23yartrep052C°58otC°04-
TIYA2138SCIIY
A2138SCIleeRdnaepaTnoPFQLdaeL230001C°58otC°04-
