DS90CR482VS/NOPB National Semiconductor, DS90CR482VS/NOPB Datasheet

IC SERIALIZER 48BIT 100-TQFP

DS90CR482VS/NOPB

Manufacturer Part Number
DS90CR482VS/NOPB
Description
IC SERIALIZER 48BIT 100-TQFP
Manufacturer
National Semiconductor
Datasheet

Specifications of DS90CR482VS/NOPB

Function
Serializer/Deserializer
Data Rate
5.38Gbps
Input Type
LVDS
Output Type
CMOS, TTL
Number Of Inputs
8
Number Of Outputs
48
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
-10°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*DS90CR482VS
DS90CR482VS

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
DS90CR482VS/NOPB
Manufacturer:
Texas Instruments
Quantity:
10 000
© 2006 National Semiconductor Corporation
DS90CR481 / DS90CR482
48-Bit LVDS Channel Link SER/DES − 65 - 112 MHz
General Description
The DS90CR481 transmitter converts 48 bits of CMOS/TTL
data into eight LVDS (Low Voltage Differential Signaling)
data streams. A phase-locked transmit clock is transmitted in
parallel with the data streams over a ninth LVDS link. Every
cycle of the transmit clock 48 bits of input data are sampled
and transmitted. The DS90CR482 receiver converts the
LVDS data streams back into 48 bits of LVCMOS/TTL data.
At a transmit clock frequency of 112MHz, 48 bits of TTL data
are transmitted at a rate of 672Mbps per LVDS data channel.
Using a 112MHz clock, the data throughput is 5.38Gbit/s
(672Mbytes/s). At a transmit clock frequency of 112MHz, 48
bits of TTL data are transmitted at a rate of 672Mbps per
LVDS data channel. Using a 66MHz clock, the data through-
put is 3.168Gbit/s (396Mbytes/s).
The multiplexing of data lines provides a substantial cable
reduction. Long distance parallel single-ended buses typi-
cally 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 cable width,
which provides a system cost savings, reduces connector
physical size and cost, and reduces shielding requirements
due to the cables’ smaller form factor.
The 48 CMOS/TTL inputs can support a variety of signal
combinations. For example, 6 8-bit words or 5 9-bit (byte +
parity) and 3 controls.
The DS90CR481/DS90CR482 chipset is improved over prior
generations of Channel Link devices and offers higher band-
width support and longer cable drive with three areas of
Generalized Block Diagrams (DS90CR481 and DS90CR482)
DS200091
enhancement. To increase bandwidth, the maximum clock
rate is increased to 112 MHz and 8 serialized LVDS outputs
are provided. Cable drive is enhanced with a user selectable
pre-emphasis feature that provides additional output current
during transitions to counteract cable loading effects. Op-
tional DC balancing on a cycle-to-cycle basis, is also pro-
vided to reduce ISI (Inter-Symbol Interference). With pre-
emphasis and DC balancing, a low distortion eye-pattern 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 of up to +/−1 LVDS data bit time (up to 80 MHz
Clock Rate). These three enhancements allow cables 5+
meters in length to be driven.
The chipset is an ideal means to solve EMI and cable size
problems associated with wide, high speed TTL interfaces.
Features
n 3.168 Gbits/sec bandwidth with 66 MHz Clock
n 5.376 Gbits/sec bandwidth with 112 MHz Clock
n 65 - 112 MHz input clock support
n LVDS SER/DES reduces cable and connector size
n Pre-emphasis reduces cable loading effects
n Optional DC balance encoding reduces ISI distortion
n Cable Deskew of +/−1 LVDS data bit time (up to 80
n 5V Tolerant TxIN and control input pins
n Flow through pinout for easy PCB design
n +3.3V supply voltage
n Transmitter rejects cycle-to-cycle jitter
n Conforms to ANSI/TIA/EIA-644-1995 LVDS Standard
MHz Clock Rate)
20009101
January 2006
www.national.com

Related parts for DS90CR482VS/NOPB

DS90CR482VS/NOPB Summary of contents

Page 1

... Channel Link devices and offers higher band- width support and longer cable drive with three areas of Generalized Block Diagrams (DS90CR481 and DS90CR482) © 2006 National Semiconductor Corporation enhancement. To increase bandwidth, the maximum clock rate is increased to 112 MHz and 8 serialized LVDS outputs are provided ...

Page 2

Generalized Transmitter Block Diagram – DS90CR481 Generalized Receiver Block Diagram – DS90CR482 Ordering Information Order Number DS90CR481VJD DS90CR482VS www.national.com Function Transmitter (Serializer) Receiver (Deserializer) 2 20009102 20009103 Package VJD100A VJD100A ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( CMOS/TTL Input Voltage LVCMOS/TTL Output Voltage −0. LVDS Receiver Input Voltage LVDS Driver Output Voltage LVDS Output Short Circuit Duration ...

Page 4

Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter I Output Short Circuit OS Current I Output TRI-STATE OZ Current LVDS RECEIVER DC SPECIFICATIONS V Differential Input High TH Threshold V Differential Input Low TL ...

Page 5

Transmitter Switching Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter LLHT LVDS Low-to-High Transition Time, (Figure 2), PRE = 0.75V (disabled) LVDS Low-to-High Transition Time, (Figure 2), PRE = Vcc (max) LHLT LVDS High-to-Low Transition ...

Page 6

Chipset RSKM Characteristics Over recommended operating supply and temperature ranges unless otherwise specified.(Notes 4, 7). See Applications Infor- mation section for more details on this parameter and how to apply it. Symbol Parameter RSKM Receiver Skew Margin without Deskew in ...

Page 7

AC Timing Diagrams Note 8: The worst case test pattern produces a maximum toggling of digital circuits, LVDS I/O and CMOS/TTL I/O. FIGURE 2. DS90CR481 (Transmitter) LVDS Output Load and Transition Times FIGURE 3. DS90CR482 (Receiver) CMOS/TTL Output Load and ...

Page 8

AC Timing Diagrams FIGURE 5. DS90CR481 (Transmitter) Setup/Hold and High/Low Times FIGURE 6. DS90CR482 (Receiver) Setup/Hold and High/Low Times FIGURE 7. DS90CR481 (Transmitter) Propagation Delay - Latency www.national.com (Continued) 8 20009115 20009131 20009127 ...

Page 9

AC Timing Diagrams (Continued) FIGURE 8. DS90CR482 (Receiver) Propagation Delay - Latency FIGURE 9. DS90CR481 (Transmitter) Phase Lock Loop Set Time FIGURE 10. DS90CR482 (Receiver) Phase Lock Loop Set Time 20009132 20009119 9 20009133 www.national.com ...

Page 10

AC Timing Diagrams FIGURE 11. DS90CR481 (Transmitter) Power Down Delay FIGURE 12. DS90CR482 (Receiver) Power Down Delay www.national.com (Continued) 10 20009121 20009134 ...

Page 11

AC Timing Diagrams (Continued) 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) RSKM ≥ Cable Skew (type, length) + ...

Page 12

LVDS Interface Optional features supported: Pre-emphasis and DESKEW FIGURE 15. 48 Parallel TTL Data Bits Mapped to LVDS Bits with DC Balance Enabled www.national.com 12 20009104 ...

Page 13

LVDS Interface (Continued) Optional feature supported: Pre-emphasis FIGURE 16. 48 Parallel TTL Data Bits Mapped to LVDS Bits with DC Balance Disabled 13 20009135 www.national.com ...

Page 14

Applications Information The DS90CR481/DS90CR482 chipset is improved over prior generations of Channel Link devices and offers higher band- width support and longer cable drive with three areas of enhancement. To increase bandwidth, the maximum clock rate is increased to 112 ...

Page 15

Applications Information current data disparity is zero or negative, the data shall be sent inverted. If the running word disparity is zero, the data shall be sent inverted. DC Balance mode is set when the BAL pin on the transmitter ...

Page 16

Applications Information HOW TO CONFIGURE FOR BACKPLANE APPLICATIONS In a backplane application with differential line impedance of 100Ω the differential line pair-to-pair skew can controlled by trace layout. The transmitter-DS90CR481 “DS_OPT” pin may be set high backplane application ...

Page 17

DS90CR481 Pin Descriptions—Channel Link Transmitter Pin Name I/O TxIN I TxOUTP O TxOUTM O TxCLKIN I TxCLKP O TxCLKM PLLSEL I PRE I DS_OPT I BAL GND I PLLV I CC PLLGND I ...

Page 18

DS90CR482 Pin Descriptions—Channel Link Receiver Pin Name I/O RxINP I RxINM I RxOUT O RxCLKP I RxCLKM I RxCLKOUT O PLLSEL I DESKEW GND I PLLV I CC PLLGND I LVDSV I CC LVDSGND ...

Page 19

DS90DR481 — Connection Diagram Transmitter - DS90CR481 - TQFP - Top View 19 20009106 www.national.com ...

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DS90CR482 – Connection Diagram www.national.com Receiver - DS90CR482 - TQFP - Top View 20 20009107 ...

Page 21

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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