SEMTECH SK2111

SK2111
1:10 Differential LVDS Clock Driver
TEST AND MEASUREMENT PRODUCTS
Description
Features
SK2111 is a 1 to 10 data/clock distributor utilizing
LVDS (Low Voltage Differential Signaling) technology
for high speed operation. Data paths are fully differential from input-to-output for low noise generation
and low pulse width distortion. The design allows
connection of 1 input to all 10 outputs. LVDS I/O
enable high speed data transmission for point-to-point
interconnects. This device can be used as a high
speed differential 1 to 10 signal distribution / fanout
replacing multi-drop bus applications for higher speed
links with improved signal quality. It can also be
used for clock distribution up to 800 MHz.
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The SK2111 accepts LVDS signal levels, LVPECL levels directly or PECL with attenuation network resistors. The inputs of SK2111 have an on-chip 100 Ω
termination resistors to minimize the component count.
The OE input is synchronous so that the outputs will
only be enabled/disabled when they are already in the
low state. This feature prevents generating any runt
clocks. The EDQUAD LQFP package has an exposed
heatslug which is connected to VEE substrate.
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Supply Voltage Range: +3.0V to +3.6V
Part-to-part skew 75 ps (Max.)
Output channel-to-channel skew is 60 ps (Max.)
800 MHz minimum toggle frequency
Differential output voltage (DVOUT) is 350 mV
(typical) with 100 Ω termination load
LVDS receiver inputs accept LVPECL signals
On-chip 100 Ω input termination resistor
Fast propagation delay of 500 ps (typical)
Receiver input threshold <±100 mV
VREF for LVDS single-ended input applications
ESD Protection of >4000V
Industrial Temperature Range: -40oC to +85oC
Available in Thermally Enhanced EDQUAD
32 Pin LQFP Package
Conforms to ANSI/TIA/EIA-644 LVDS standard
10
CLK1
Q0:Q9
CLK1*
Q0*:Q9*
100 Ω
Q
Q6*
Q6
18
17
16
VCC
Q2*
26
15
Q7
Q2
27
14
Q7*
Q1*
28
13
Q8
Q1
29
12
Q8*
Q0*
30
11
Q9
Q0
31
10
Q9*
VCC
32
9
VCC
SK2111
1
2
3
4
5
6
7
8
VEE
CLK1*
CLK1
VREF
NC
NC
1.2V
VCC
VREF
20 19
25
D
OE
21
Q5*
22
Q5
23
Q4*
Q4
24
VCC
OE
LEN
Q3*
Functional Block Diagram
Q3
Pin Description
Pin Names
Pi n
Function
CLK1, CLK1*
Differential LVDS Input Pair
Q0, Q9, Q0*, Q9*
Differential LVDS Outputs
V REF
LVDS Reference Voltage 1.2V
OE
Output Enable Input LV TTL / LVCMOS
Revision 3 / April 24, 2003
OE
Q0-Q9
Q0*-Q9*
0
LOW
HIGH
1
Qn
Qn*
Truth Table
1
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SK2111
TEST AND MEASUREMENT PRODUCTS
Package Information
Thermally Enhanced
EDQUAD 32 Pin LQFP Package
D
D1
HEATSINK INSTRUSION .0127 MAX.
N
EXPOSED HEATSINK
4.32 ± .12 DIAMETER
1
-A-
E1
-B-
E
NOTES:
1. All dimensions are in millimeters (mm).
2. Dimensions shown are nominal with
tolerance as indicated.
3. L / F: EFTEC 64T copper, or equivalent,
0.127 mm (.005”) thick.
4. Foot length “L” is measured at gage
plane, at 0.25 above the seating
plane.
-D-
12˚ Typ.
DIMS.
TOL.
Millimeters
A
0.2
1.4 Min./1.6 Max.
A1
A2
A
e
A1
12˚ Typ.
0.20 RAD. TYP.
0.20 RAD. TYP.
.05 Min./.15 Max
A2
±.05
1.40
D
±.20
9.00
D1
±.10
7.00
E
±.20
9.00
E1
±.10
7.00
L
+.15/-.10
.60
e
BASIC
.80
b
±.05
.35
0°- 7°
θ
ddd
MAX.
.20
ccc
MAX.
.10
6˚ ± 4˚
A
STANDOFF
A1
.25
SEATING
PLANE
0.17 MAX.
-C-
q
b
L
ddd M C A - B S D S
LEAD COPLANARITY
ccc C
Revision 3 / April 24, 2003
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SK2111
TEST AND MEASUREMENT PRODUCTS
Absolute Maximum Ratings*
Sy mb ol
P aram et er
Val u e
Unit
V CC
Pow er Su p p l y
-0.3 to 4.6
V
VI
In p u t Vol tag e
-0.3 to V CC + 0.3
V
IIN
In p u t Cu rren t
±20
mA
I OU T
O u t p u t Cu rren t
Con t i n u ou s
Su rg e
50
10 0
mA
mA
θJA for
EDQUA D LQFP
T h ermal R esi stan ce ( J u n cti on -to-amb i en t)
at 400 L FPM, 4 l ay er b oard
29.8
oC/W
θJA for
EDQUA D LQFP
T h ermal R esi stan ce ( J u n cti on -to-amb i en t)
at Sti l l A i r, 4 l ay er b oard
44
oC/W
Tstg
Storag e Temp eratu re R an g e
-40 to 125
oC
* Maximum Ratings are those beyond which damage to the device may occur.
DC Characteristics
SK2111 LVCMOS/LVTTL DC Electrical Characteristics
(VCC = 3.0V to 3.6V, VEE = 0V)
TA = -40o C
Characteristics
Min
VI H
Input HIGH Voltage
2.0
VI L
Input LOW Voltage
VC L
Input Clamp Voltage
Symbol
Revision 3 / April 24, 2003
Typ
TA = 0o C
Max
Min
Typ
Max
2.0
-0.8
Min
Typ
Max
-0.8
Min
Typ
3
Conditions
-0.8
0.8
-1.5
U n i ts
V
0.8
-1.5
Max
2.0
0.8
-1.5
TA = 85o C
2.0
0.8
-1.5
TA = 25o C
-0.8
V
IC L = 18 mA
V
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SK2111
TEST AND MEASUREMENT PRODUCTS
DC Characteristics (continued)
SK2111 LVDS Input/Output DC Electrical Characteristics
(VCC = 3.0V to 3.6V, VEE = 0V)
TA = - 40o C
Symbol
Min
Characteristics
Typ
TA = 0o C
Max
Min
Typ
TA = 25o C
Max
Min
Typ
TA = 85o C
Max
Min
Typ
Max
U n i ts
VIH
Input High Voltage
0.9
2.6
0.9
2.6
0.9
2.6
0.9
2.6
V
VIL
Input Low Voltage
0.65
2.4
0.65
2.4
0.65
2.4
0.65
2.4
V
VO H
Output High Voltage
1.25
1.8
1.25
1.8
1.25
1.8
1.25
1.8
V
VO L
Output Low Voltage
0.95
1.5
0.95
1.5
0.95
1.5
0.95
1.5
V
V PP
Peak-to-Peak Input
Swing
0.1
1.0
0.1
1.0
0.1
1.0
0.1
1.0
V
DV O U T
Peak-to-peak Voltage 1
0.25
0.35
0.47
0.25
0.37
0.47
0.25
0.39
0.47
0.25
0.4
0.47
V
VR E F
LVDS Reference Voltage
1.1
1.2
1.3
1.1
1.2
1.3
1.1
1.2
1.3
1.1
1.2
1.3
V
RI N
Input Impedance
80
95
120
80
100
120
80
105
120
80
110
120
Ω
SK2111 Power Supply DC Electrical Characteristics
(VCC = 3.0V to 3.6V, VEE = 0V)
TA = - 40o C
TA = 0o C
TA = 25o C
TA = 85o C
Symbol
Characteristics
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
U n i ts
IC C
Total Supply Current4
120
165
230
120
175
230
120
185
230
120
190
230
mA
Revision 3 / April 24, 2003
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SK2111
TEST AND MEASUREMENT PRODUCTS
AC Characteristics
SK2111 AC Electrical Characteristics
(VCC = 3.0V to 3.6V, VEE = 0V)
TA = -40o C
Symbol
Characteristics
Min
FM A X
Max Toggle Frequency 2
800
tPLH
t P HL
Propagation Delay
CLK to Output
400
t r, t f
Output Rise and Fall Time
(20% to 80% )
150
TC C S
Output Channel-to-Channel
Skew
Typ
TA = 0o C
Max
Min
Typ
TA = 25o C
Max
800
485
570
390
320
155
Min
Typ
TA = 85o C
Max
800
480
60
570
410
330
160
60
Min
Typ
Max
800
495
580
430
340
165
60
U n i ts
MHz
515
600
ps
360
ps
60
ps
NOTES:
1. DVOUT is obtained as follows: Voltages of Q and Q* outputs with respect to VEE are measured. The absolute
difference between the high and the low is equal to DVOUT.
2. 250 mV minimum output peak-to-peak swing for Max toggle frequency.
3. For part ordering information, see HPP Part Ordering Information Data Sheet
4. RL = 100Ω, 800 MHz, OE = High
Revision 3 / April 24, 2003
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SK2111
TEST AND MEASUREMENT PRODUCTS
AC Characteristics (continued)
AC Timing Diagrams
PIN Descriptions
CL
R1+
Pulse
Generator
R
R150Ω
RL
D
OUT+
OUT-
CL
50Ω
Figure 1: LVDS Output Load
Ordering Information
O r d er i n g C o d e
Packag e ID
SK2111A XF
32-LQFP-EDQU A D
SK2111A XFT
32-LQFP-EDQU A D
Contact Information
Semtech Corporation
Test and Measurement Division
10021 Willow Creek Rd., San Diego, CA 92131
Phone: (858) 695-1808 FAX: (858) 695-2633
Revision 3 / April 24, 2003
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