CLINK3V48BT-133 National Semiconductor, CLINK3V48BT-133 Datasheet

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CLINK3V48BT-133

Manufacturer Part Number
CLINK3V48BT-133
Description
BOARD EVAL FOR DS90CR485, 486
Manufacturer
National Semiconductor

Specifications of CLINK3V48BT-133

Main Purpose
Interface, SerDes (Serializer / De-Serializer)
Embedded
No
Utilized Ic / Part
DS90CR485, DS90CR486
Primary Attributes
Serializes 48 LVCMOS/LVTTL to 8 LVDS, 66 ~ 133 MHz
Secondary Attributes
Transmits over 2 Meter 3M MDR LVDS Cable
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
© 2006 National Semiconductor Corporation
DS90CR486
133MHz 48-Bit Channel Link Deserializer (6.384 Gbps)
General Description
The DS90CR486 receiver converts eight Low Voltage Differ-
ential Signaling (LVDS) data streams back into 48 bits of
LVCMOS/LVTTL data. Using a 133MHz clock, the data
throughput is 6.384Gbit/s (798Mbytes/s).
The multiplexing of data lines provides a substantial cable re-
duction. Long distance parallel single-ended buses typically
require a ground wire per active signal (and have very limited
noise rejection capability). Thus, for a 48-bit wide data and
one clock, up to 98 conductors are required. With this Channel
Link chipset as few as 19 conductors (8 data pairs, 1 clock
pair and a minimum of one ground) are needed. This provides
an 80% reduction in interconnect width, which provides a sys-
tem cost savings, reduces connector physical size and cost,
and reduces shielding requirements due to the cables' smaller
form factor.
The DS90CR486 deserializer is improved over prior genera-
tions of Channel Link devices and offers higher bandwidth
support and longer cable drive with three areas of enhance-
ment. To increase bandwidth, the maximum clock rate is
increased to 133 MHz and 8 serialized LVDS outputs are pro-
vided. Cable drive is enhanced with a user selectable pre-
emphasis (on DS90CR485) feature that provides additional
output current during transitions to counteract cable loading
effects. Optional DC balancing on a cycle-to-cycle basis, is
also provided to reduce ISI (Inter-Symbol Interference). With
pre-emphasis and DC balancing, a low distortion eye-pattern
Generalized Block Diagram
200252
is provided at the receiver end of the cable. A cable deskew
capability has been added to deskew long cables of pair-to-
pair skew. These three enhancements allow long cables to
be driven.
The DS90CR486 is intended to be used with the DS90CR485
Channel Link Serializer. It is also backward compatible with
serializers DS90CR481 and DS90CR483. The DS90CR486
is footprint compatible with the DS90CR484.
The chipset is an ideal solution to solve EMI and interconnect
size problems for high-throughput point-to-point applications.
For more details, please refer to the “Applications Informa-
tion” section of this datasheet.
Features
Up to 6.384 Gbps throughput
66MHz to 133MHz input clock support
Reduces cable and connector size and cost
Cable Deskew function
DC balance reduces ISI distortion
For point-to-point backplane or cable applications
Low power, 890 mW typ at 133MHz
Flow through pinout for easy PCB design
+3.3V supply voltage
100-pin TQFP package
Conforms to TIA/EIA-644-A-2001 LVDS Standard
20025203
November 2006
www.national.com

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CLINK3V48BT-133 Summary of contents

Page 1

... ISI (Inter-Symbol Interference). With pre-emphasis and DC balancing, a low distortion eye-pattern Generalized Block Diagram © 2006 National Semiconductor Corporation is provided at the receiver end of the cable. A cable deskew capability has been added to deskew long cables of pair-to- pair skew. These three enhancements allow long cables to be driven ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( LVCMOS/LVTTL Output Voltage LVDS Receiver Input Voltage Junction Temperature Storage Temperature Lead Temperature (Soldering, 4 sec.) Maximum Package Power Dissipation Capacity @ 25° ...

Page 3

Receiver Switching Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter CLHT LVCMOS/LVTTL Low-to-High Transition Time, (Figure 2), Rx data out, (Note 5) LVCMOS/LVTTL Low-to-High Transition Time, (Figure 2), Rx clock out, (Note 5) CHLT LVCMOS/LVTTL ...

Page 4

AC Timing Diagrams Note 7: The worst case test pattern produces a maximum toggling of digital circuits, LVDS I/O and LVCMOS/LVTTL I/O. FIGURE 2. DS90CR486 LVCMOS/LVTTL Output Load and Transition Times FIGURE 3. DS90CR486 Setup/Hold and High/Low Times www.national.com FIGURE ...

Page 5

FIGURE 4. DS90CR486 Propagation Delay - Latency FIGURE 5. DS90CR486 Phase Lock Loop Set Time (V FIGURE 6. DS90CR486 Power Down Delay 5 20025228 20025220 > 3.0V) CC 20025222 www.national.com ...

Page 6

C—Setup and Hold Time (Internal data sampling window) defined by Rspos (receiver input strobe position) min and max Tppos—Transmitter output pulse position (min and max) RSKMD = ISI (Inter-symbol interference) + TPPOS(variance) + LVDS Source Clock Jitter (cycle to cycle) ...

Page 7

LVDS Interface FIGURE 8. 48 LVCMOS/LVTTL Outputs Mapped to 8 LVDS Inputs (DC Balance Mode- Disable, BAL = Low) (E1 - Falling Edge Rising Edge) 7 20025204 www.national.com ...

Page 8

FIGURE 9. 48 LVCMOS/LVTTL Outputs Mapped to 8 LVDS Inputs(DC Balance Mode - Enable, BAL = High) www.national.com (E1 - Falling Edge Rising Edge) 8 20025257 ...

Page 9

DS90CR486 Outputs Mapped to DS90CR485 Outputs/DS90CR483 Inputs DS90CR486 Receiver Output RxOUT0 RxOUT1 RxOUT2 RxOUT3 RxOUT4 RxOUT5 RxOUT6 RxOUT7 RxOUT8 RxOUT9 RxOUT10 RxOUT11 RxOUT12 RxOUT13 RxOUT14 RxOUT15 RxOUT16 RxOUT17 RxOUT18 RxOUT19 RxOUT20 RxOUT21 RxOUT22 RxOUT23 RxOUT24 RxOUT25 RxOUT26 RxOUT27 RxOUT28 RxOUT29 ...

Page 10

DS90CR486 Receiver Output RxOUT47 * E1 = Falling Edge and E2 = Rising Edge of RxCLK P/M Input Clock Edge www.national.com DS90CR485 Transmitter Input * E1-D23 10 DS90CR483 Transmitter Input TxIN47 ...

Page 11

DS90CR486 Pin Descriptions — Channel Link Receiver Pin Name I/O RxINP I RxINM I RxOUT O RxCLKP I RxCLKM I RxCLKOUT O PLLSEL DESKEW I BAL I CON1 GND I PLLV I CC ...

Page 12

Applications Information DC BALANCE In addition to data information an additional bit is transmitted on every LVDS data signal line during each cycle as shown in Figure 9. This bit is the DC balance bit (DCB). The purpose of the ...

Page 13

The transmitter-DS90CR485 “DS_OPT” pin may be set high backplane application with short PCB dis- tance traces, pre-emphasis from the transmitter is typically not required. The “PRE” pin should be left open (do not tie to ground). ...

Page 14

CONFIGURATION 1 DS90CR481/483 and DS90CR484 with DC Balance ON (BAL=High, 33MHz to 80MHz) − The DS_OPT pin at the input of the transmitter DS90CR481/483 must be applied low for a minimum of four clock cycles in order for the receiver ...

Page 15

Pin Diagram Receiver - DS90CR486 (Top View) 15 20025207 www.national.com ...

Page 16

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Dimensions show in millimeters Order Number DS90CR486VS NS Package Number VS100A 16 ...

Page 17

Notes 17 www.national.com ...

Page 18

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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