ICST ICS83940AY, ICS83940AYT Datasheet
PRELIMINARY
Integrated
Circuit
Systems, Inc.
GENERAL DESCRIPTION
,&6
HiPerClockS™
terminated transmission lines. The effective fanout can be increased from 18 to 36 by utilizing the ability of the outputs to
drive two series terminated lines. The differential clock
input is designed to accept any differential input levels
including LVPECL.
The ICS83940 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
ICS83940 ideal for those clock distribution applications demanding well defined performance and repeatability.
The ICS83940 is a low skew, 1-to-18 Fanout
Buffer and a member of the HiPerClockS™
family of High Performance Clock Solutions from
ICS. The low impedance LVCMOS outputs are designed to drive 50Ω series or parallel
ICS83940
LOW SKEW, 1-TO-18
L VCMOS FANOUT BUFFER
FEATURES
• 18 L VCMOS outputs, 23Ω typical output impedance
• Output frequency up to 200MHz
• 150ps output skew
• Part to part skew: 850ps
• Selectable LVCMOS or differential clock input
• LVTTL / LVCMOS clock select input
• Full 3.3V , 2.5V or mixed 3.3V , 2.5V supply modes
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
BLOCK DIAGRAM PIN ASSIGNMENT
Q1
Q0
CLK_SEL
CLK0
nCLK0
LVCMOS_CLK
0
1
Q0
LVCMOS_CLK
Q1 - Q16
Q17
GND
GND
CLK_SEL
CLK
nCLK
VDDI
VDDO
32 31 30 29 28 27 26 25
1
2
3
4
5
6
7
8
ICS83940
9 10 11 12 13 14 15 16
Q16
Q17
32-Lead LQFP
7mm x 7mm x 1.4mm package body
VDDO
Q3
Q2
Q14
GND
Q15
Y Pacakge
T op View
Q4
Q13
Q5
Q12
GND
24
23
22
21
20
19
18
17
VDDO
Q6
Q7
Q8
VDDI
Q9
Q10
Q11
GND
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.
83940AY www.icst.com/products/hiperclocks.html REV. B JULY 31, 2001
1
PRELIMINAR Y
Integrated
Circuit
Systems, Inc.
TABLE 1. PIN DESCRIPTIONS
rebmuNemaNepyTnoitpircseD
52,71,21,2,1DNGrewoP.dnuorgottcennoC.dnuorgylppusrewoptuptuO
3KLC_SOMCVLtupnInwodlluP.slevelecafretniSOMCVL.tupnikcolC
4LES_KLCtupnInwodlluP
5KLCtupnInwodlluP
6KLCntupnIpulluP
12,7IDDVrewoP.V5.2roV3.3ottcennoC.ylppusrewoptupnI
92,61,8ODDVrewoP.V5.2roV3.3ottcennoC.ylppusrewoptuptuO
,41,31,11,01,9
,22,02,91,81,51
,82,72,62,42,32
23,13,03
ICS83940
LOW SKEW, 1-TO-18
L VCMOS FANOUT BUFFER
tupnikcolcSOMCVLtceleS.tupnitceleskcolC
nehwstupnikcolcLCEPVLstceleS.HGIHnehw
.WOL
laitnereffidynA.tupnikcolclaitnereffidgnitrevni-noN
.slevelecafetni
laitnereffidynA.tupnikcolclaitnereffidgnitrevnI
.slevelecafetni
,31Q,41Q,51Q,61Q,71Q
,8Q,9Q,01Q,11Q,21Q
,3Q,4Q,5Q,6Q,7Q
0Q,1Q,2Q
tuptuO
32.stuptuokcolC Ω .ecnadepmituptuolacipyt
slevelecafretniSOMCVL
TABLE 2. PIN CHARACTERISTICS
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
NIC
DPC
PULLUPRrotsiseRpulluPtupnI 15KΩ
NWODLLUPRrotsiseRnwodlluPtupnI 15KΩ
TUORecnadepmItuptuO 32
tupnI
ecnaticapaC
)tuptuorep(
,0KLCn,0KLC
KLC_SOMCVL
LES_KLC 4Fp
V564.3=ODDV,IDDVFp
ecnaticapaCnoitapissiDrewoP
,V564.3=IDDV
V526.2=ODDV
V526.2=ODDV,IDDVFp
4Fp
Fp
Ω
83940AY www.icst.com/products/hiperclocks.html REV. B JULY 31, 2001
2
PRELIMINARY
Integrated
Circuit
Systems, Inc.
LOW SKEW, 1-TO-18
L VCMOS FANOUT BUFFER
TABLE 3A. CLOCK SELECT FUNCTION TABLE
tupnIlortnoCkcolC
LES_KLC0KLCn,0KLCKLC_SOMCVL
0detceleSdetceles-eD
1detceles-eDdetceleS
TABLE 3B. CLOCK INPUT FUNCTION TABLE
stupnIstuptuO
LES-KLCKLC_SOMCVL0KLC0KLCn
0 — 01WOLdednEelgniSotlaitnereffiDgnitrevnInoN
0 — 10HGIHdednEelgniSotlaitnereffiDgnitrevnInoN
0 — 01ETON;desaiBWOLdednEelgniSotdednEelgniSgnitrevnInoN
0 — 11ETON;desaiBHGIHdednEelgniSotdednEelgniSgnitrevnInoN
0 — 1ETON;desaiB0HGIHdednEelgniSotdednEelgniSgnitrevnI
0 — 1ETON;desaiB1WOLdednEelgniSotdednEelgniSgnitrevnI
10 ——WOLdednEelgniSotdednEelgniSgnitrevnInoN
11 ——HGIHdednEelgniSotdednEelgniSgnitrevnInoN
1.0adnadnuorgoteulavlauqeforotsisera,IDDVµ sitniophctiwsgnitluserehT.dnuorgottupniehtmorfroticapacF
.2/IDDV
urht0Q
71Q
ICS83940
edoMtuptuOottupnIytiraloP
stestupnidesaibehttaegatlovehT.desaibebstupnilaitnereffidehtfoenotahtseriuqeresutupnidedneelgniS:1ETON
otrotsiserasikrowtensaibtupnidednemmocerehtsleveltupniSOMCVLroF.tupnidedneelgnisehtroftniophctiwseht
83940AY www.icst.com/products/hiperclocks.html REV. B JULY 31, 2001
3
PRELIMINAR Y
Integrated
Circuit
Systems, Inc.
ICS83940
LOW SKEW, 1-TO-18
L VCMOS FANOUT BUFFER
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VDD 4.6V
Inputs, V
Outputs, V
Package Thermal Impedance, θ
Storage T emperature, T stg -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 the
DC Characteristics
affect product reliability .
TABLE 4A. DC CHARACTERISTICS, VDDI = VDDO = 3.3V±5%, TA = 0° TO 70°
DDItnerruCylppuSrewoPV564.3=ODDV=IDDV07Am
I -0.5V to VDD+0.5 V
O -0.5V to VDD+0.5V
JA 46°C/W (0lfpm)
or
AC Characteristics
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
IDDVegatloVylppuSrewoPtupnI 531.33.3564.3V
ODDVegatloVylppuSrewoPtuptuO 531.33.3564.3V
is not implied. Exposure to absolute maximum rating conditions for extended periods may
TABLE 4B. LVCMOS DC CHARACTERISTICS, VDDI = VDDO = 3.3V±5%, TA = 0° TO 70°
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
HIVegatloVhgiHtupnI
LIVegatloVwoLtupnIKLC_FERV531.3=IDDV3.0-3.1V
HIItnerruChgiHtupnI
LIItnerruCwoLtupnI
HOVegatloVhgiHtuptuO
LOVegatloVwoLtuptuO
KLC_FER
LES_KLC
LES_KLCV531.3=IDDV3.0-8.0V
,KLC_FER
LES_KLC
,KLC_FER
LES_KLC
V564.3=IDDV28.3V
V564.3=NIV=IDDV051Aµ
V0=NIV,V564.3=IDDV5-Aµ
,V531.3=ODDV
Am02-=HOI
,V531.3=ODDV
Am02=LOI
4.2V
6.0V
TABLE 4C. DIFFERENTIAL DC CHARACTERISTICS, VDDI = VDDO = 3.3V±5%, TA = 0° TO 70°
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
HIItnerruChgiHtupnI
LIItnerruCwoLtupnI
PPVegatloVtupnIkaeP-ot-kaeP 51.03.1V
RMCV
83940AY www.icst.com/products/hiperclocks.html REV. B JULY 31, 2001
2,1ETON
0KLCV564.3=NIV=IDDV051Aµ
0KLCnV564.3=NIV=IDDV5Aµ
0KLCV0=NIV,V564.3=IDDV5-Aµ
0KLCnV0=NIV,V564.3=IDDV051-Aµ
;egatloVedoMnommoCtupnI
.HIVsadenifedsiegatlovedomnommoC:2ETON
4
5.0+DNG58.0-DDVV
.V3.0+DDVsi0KLCn,0KLCrofegatlovtupnimumixameht,snoitacilppadedneelgnisroF:1ETON
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