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83940BYLF

P1-P3P4-P6P7-P9P10-P12P13-P13
83940BY www.idt.com REV. B JANUARY 31, 2014
1
Low Skew, 1-to-18 LVPECL-to-
LVCMOS/LVTTL Fanout Buffer
ICS83940
PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES JANUARY 27, 2015
GENERAL DESCRIPTION
The ICS83940 is a low skew, 1-to-18 LVPECL-to-LVCMOS/
LVTTL Fanout Buffer. The ICS83940 has twoselectable
clock inputs. The PCLK, nPCLK pair can accept LVPECL,
CML, or SSTL input levels. The LVCMOS_CLK can accept
LVCMOS or LVTTL input levels. The low impedance
LVCMOS/LVTTL outputs are designed to drive 50Ω series
or parallel terminated transmission lines.
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.
BLOCK DIAGRAM PIN ASSIGNMENT
FEATURES
• Eighteen LVCMOS/LVTTL outputs, 16Ω typical output
impedance
• Selectable LVCMOS_CLK or LVPECL clock inputs
• PCLK, nPCLK supports the following input types:
LVPECL, CML, SSTL
• LVCMOS_CLK accepts the following input levels:
LVCMOS or LVTTL
• Maximum output frequency: 250MHz
• Output skew: 150ps (maximum)
• Part to part skew: 750ps (maximum)
• Full 3.3V or 2.5V supply modes
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
• Lead-Free package fully RoHS compliant
• For New Designs Use: 83940DYLF or 83940DYILF
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Pacakge
Top View
Q0:Q17
CLK_SEL
PCLK
nPCLK
LVCMOS_CLK
0
1
18
3
2
3
1
30
2
9
2
8
27
2
6
2
5
9
1
0
12
1
3
14
1
5
1
6
1
2
3
4
5
6
7
8
24
2
3
22
21
2
0
1
9
1
8
17
Q6
Q7
Q8
V
DD
Q9
Q
1
0
Q
1
1
G
N
D
G
N
D
G
N
D
LVCMOS_CL
K
CLK_SE
L
P
C
L
K
nP
C
L
K
V
DD
V
DD
O
V
DD
O
Q
1
2
Q
1
3
Q
1
4
G
N
D
Q
1
5
Q
1
6
Q
1
7
G
N
D
Q5
Q
4
Q3
V
DD
O
Q2
Q1
Q0
ICS839
4
0
83940BY www.idt.com REV. B JANUARY 31, 2014
2
Low Skew, 1-to-18 LVPECL-to-
LVCMOS/LVTTL Fanout Buffer
ICS83940
PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES JANUARY 27, 2015
TABLE 1. PIN DESCRIPTIONS
rebmuNemaNepyTnoitpircseD
52,71,21,2,1DNGrewoP.dnuorgylppusrewoP
3KLC_SOMCVLtupnInwodlluP.slevelecafretniLTTVL/SO
MCVL.tupnikcolC
4LES_KLCtupnInwodlluP
kcolcLTTVL/SOMCVLstceleS.tupnitceleskcolC
stupniKLCPn,KLCPstceleS.HGI
Hnehwtupni
.slevelecafretniLTTVL/SOMCVL.WOLnehw
5KLCPtupnInwodlluP.tupnikcolcLCEPVLlaitnereffidgnitrevni-no
N
6KLCPntupnIpulluP.tupnikcolcLCEPVLlaitnereffidgnitrevnI
12,7V
DD
rewoP.snipylppuseroC
92,61,8V
ODD
rewoP.snipylppustuptuO
,41,31,11,01,9
,22,02,91,81,51
,82,72,62,42,32
23,13,03
,31Q,41Q,51Q,61Q,71Q
,8Q,9Q,0
1Q,11Q,21Q
,3Q,4Q,5Q,6Q,7Q
0Q,1Q,2Q
tuptuO
61.stuptuokcolC Ω .ecnadepmituptuolacipyt
.slevelecafretniLTTVL/S
OMCVL
:ETON
pulluP
dna
wodlluP
.seulavlacipytrof,scitsiretcarahCniP,2elbaTeeS.srotsisertupnilanretniotrefern
TABLE 2. PIN CHARACTERISTICS
TABLE 3A. CLOCK SELECT FUNCTION TABLE
TABLE 3B. CLOCK INPUT FUNCTION TABLE
tupnIlortnoCkcolC
LES_KLCKLCPn,KLCPKLC_SOMCVL
0detceleSdetceles-eD
1detceles-eDdetceleS
stupnIstuptuO
edoMtuptuOottupnIytiraloP
LES_KLCKLC_SOMCVLKLCPKLCPn71Q:0Q
0— 0 1 WOLdednEelgniSotlaitnereffiDgnitrevnIno
N
0— 1 0 HGIHdednEelgniSotlaitnereffiDgnitrevnInoN
0— 0
;desaiB
1ETON
WOLdednEelgniSotdednEelgniSgnitrevnInoN
0— 1
;desaiB
1ET
ON
HGIHdednEelgniSotdednEelgniSgnitrevnInoN
0— 1ETON;desaiB0HGIHdednEelgniSotdednEelgniSgnitrevnI
0— 1ETON;desaiB1WOLde
dnEelgniSotdednEelgniSgnitrevnI
10 ——WOLdednEelgniSotdednEelgniSgnitrevnInoN
11 —— HGIHdednEelgniSotdednEelgniSgnitrevn
InoN
."sleveLdednEelgniStpeccAottupnIlaitnereffiDehtgniriW".noitcesnoitamrofnInoitacilppAehtotreferesa
elP:1ETON
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
C
NI
ecnaticapaCtupnI 4Fp
C
DP
ecnaticapaCnoitapissiDrewoP
)tuptuorep(
V
DD
V,
ODD
74.3=31Fp
V
DD
V,
ODD
526.2=11Fp
R
PULLUP
rotsiseRpulluPtupnI 15KΩ
R
NWODLLUP
rotsiseRnwodlluPtupnI 15KΩ
R
TUO
ecnadepmItuptuO116112
Ω
83940BY www.idt.com REV. B JANUARY 31, 2014
3
Low Skew, 1-to-18 LVPECL-to-
LVCMOS/LVTTL Fanout Buffer
ICS83940
PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES JANUARY 27, 2015
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, V
DD
= V
DDO
= 3.3V±5%, TA = 0° TO 70°
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
egatloVylppuSeroC 531.33.3564.3V
V
ODD
egatloVylppuStuptuO 531.33.3564.3V
I
DD
tnerruCylppuSrewoP 52Am
I
ODD
tnerruCylppuStuptuO 52Am
TABLE 4B. DC CHARACTERISTICS, V
DD
= V
DDO
= 3.3V±5%, TA = 0° TO 70°
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
HI
egatloVhgiHtupnIKLC_SOMCVL4.2V
DD
V
V
LI
egatloVwoLtupnIKLC_SOMCVL 8.0V
V
PP
kaeP-ot-kaeP
egatloVtupnI
KLCPn,KLCP003Vm
V
RMC
edoMnommoCtupnI
2,1ETON;egatloV
KLCPn,KLCP5.1+DNGV
DD
V
I
NI
tnerruCtupnI 002±Aµ
V
HO
egatloVhgiHtuptuOI
HO
Am02-=4.2V
V
LO
egatloVwoLtuptuOI
LO
Am02=5.0V
siKLCPn,KLCProfegatlovtupnimumixameht,snoitacilppadedneelgnisroF:1ETON V
DD
.V3.0+
sadenifedsiegatlovedomnommoC:2ETONV
HI
.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
DD
4.6V
Inputs, V
I
-0.5V to V
DD
+ 0.5 V
Outputs, V
O
-0.5V to V
DDO
+ 0.5V
Package Thermal Impedance, θ
JA
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.
P1-P3P4-P6P7-P9P10-P12P13-P13

83940BYLF

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Buy 83940BYLF
Manufacturer:
Description:
IC CLK BUFFER 2:18 250MHZ 32TQFP
Lifecycle:
New from this manufacturer.
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