LVPECL Terminators
Technical
Data Sheet
RoHS Compliant Parts Available
Description
These integrated termination networks provide high
performance line termination designs for both 2.5V & 3.3V
LVPECL busses.
Specifically designed shielding inside the package combined
with a ceramic substrate virtually eliminates cross talk between
channels that is common in other termination networks and
resistor arrays.
The BGA packaging has been proven to reduce rework and
improve reliability.
Style G
3
Features
•
•
•
•
•
•
•
8 Bit Thevenin Termination Set
Compliant for LVPECL Termination
Excellent High Frequency Performance
Slim BGA Package
1% Resistor Tolerance
Low Channel to Channel Cross Talk
RoHS Compliant Designs Available
•
Compatible with both lead and lead-
free processes
LVPECL Thevenin Termination
R1
R1
2
Zo
R2
R2
1
A
B
C
D
E
F
G
H
Zo = 50 Ohms
V
C C
= 3.3 Volts
V
EE
= 0 Volts
Zo = 50 Ohms
V
C C
= 2.5 Volts
V
EE
= 0 Volts
Thevenin Vtt = 1.3Volts
R1 = 127 Ohms
R2 = 82.5 Ohms
Thevenin Vtt = 0.5 Volts
R1 = 250 Ohms
R2 = 62.5 Ohms
V
EE
Electrical Specifications
Resistor Tolerance:
TCR
Operating Temperature Range
Maximum Resistor Power:
RT1250
RT1250
RT1251
RT1251
Maximum Package Power:
Process Requirements:
Maximum Re-flow Temperature
R1
R2
R1
R2
±
1.0%
±
200 ppm/°C
-55°C to +125°C
B6-1.27mm Pitch
96mW
96mW
143mW
164mW
1.0 Watt at 70°C
Typical Application
LVPECL
DRIVERS
V
EE
V
C C
R2 R1
LVPECL
RECEVERS
B7-1.00mm Pitch
60mW
66mW
91mW
105mW
Per IPC/JEDEC J-STD-020C
CTS
RT2250/RT2251
Ordering Information
Standard
Part No.
RT1250B6*
RT1250B7
RT1251B6
R1
Ω
127
127
250
R2
Ω
82.5
82.5
62.5
Bits
8
8
8
Pitch (mm)
1.27
1.00
1.27
RoHS
Part No.
RT2250B6*
RT2250B7
RT2251B6
Packaging Information
Suffix
Tape Width
Carrier Pitch
Reel Diameter
Parts/Reel
TR7
24 mm
8 mm
7 inch
1,000
TR13
24mm
8 mm
13 inch
4,000
RT1251B7
250
62.5
8
1.00
RT2251B7
*Indicates available Top Probe-able part numbers.
Refer to the following link for detailed Top Side Probe-able information:
www.ctscorp.com/components/clearone/TopProveClearOne.pdf
Part Number Coding
7 inch reel, Add TR7 to part
number, example RT2250B7TR7
13 inch reel, Add TR13 to part
number, example RT2250B7TR13
(Bulk packaging is not available)
Direction of Feed
CTS Electronic Components
www.ctscorp.com
© 2006 CTS Corporation. All rights reserved. Information subject to change.
Page 1
LVPECL Terminators
October 07
Recommended Land Pattern
Outline of Substrate
BGA Routing Scheme
Blind vias to V
EE
reference plane layer
recommended on
every other row as
shown.
Blind vias to V
CC
reference plane layer
recommended on
every other row as
shown.
PCB Pad Diameter
1.00mm Pitch (B7) = 0.51mm/.020 inch (minimum)
1.27mm pitch (B6) = 0.64mm/.025 inch (minimum)
Solder Mask Dia = Pad
Diameter +.15mm (.006 inch)
Signal Lines -
9 mil trace width
or similar to
achieve
controlled 50
Ohm
transmission line
impedance Zo.
For .006" Thick Solder Paste Stencil, Aperture Opening Should
be Equal to the PCB Pad Diameter.
Refer to
www.ctscorp.com/components/clearone.asp
for
additional PCB design information
Mechanical Diagram
L
H
W
RT_250B_
CTS YRWK
A1 Identifier
P (Pitch)
P (Pitch)
K
D
1.00mm Pitch
RT1250B7
RT2250B7
RT1251B7
RT2251B7
RT1250B6
RT2250B6
RT1251B6
RT2251B6
mm
inch
L
8.00±0.15
.315±.006
W
3.00±0.15
.118±.006
H
1.19±0.15
.047±.006
P
1.00±0.25
.039±.010
D
0.64±0.05
.025±.002
K
0.50±0.25
.020±.010
1.27mm Pitch
mm
inch
L
10.16±0.15
.400±.006
W
3.81±0.15
.150±.006
H
1.32±0.15
.052±.006
P
1.27±0.25
.050±.010
D
0.76±0.05
.030±.002
K
0.64±0.25
.025±.010
Complete ClearONE Product, Processing, and Application Information can be found at the following link:
http://www.ctscorp.com/components/clearone.asp
CTS Electronic Components
www.ctscorp.com
© 2006 CTS Corporation. All rights reserved. Information subject to change.
Page 2
LVPECL Terminators
October 07
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