DS90CR283MTD NSC [National Semiconductor], DS90CR283MTD Datasheet

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DS90CR283MTD

Manufacturer Part Number
DS90CR283MTD
Description
28-Bit Channel Link-66 MHz
Manufacturer
NSC [National Semiconductor]
Datasheet
© 1998 National Semiconductor Corporation
DS90CR283/DS90CR284
28-Bit Channel Link-66 MHz
General Description
The DS90CR283 transmitter converts 28 bits of CMOS/TTL
data into four LVDS (Low Voltage Differential Signaling) data
streams. A phase-locked transmit clock is transmitted in par-
allel with the data streams over a fifth LVDS link. Every cycle
of the transmit clock 28 bits of input data are sampled and
transmitted. The DS90CR284 receiver converts the LVDS
data streams back into 28 bits of CMOS/TTL data. At a trans-
mit clock frequency of 66 MHz, 28 bits of TTL data are trans-
mitted at a rate of 462 Mbps per LVDS data channel. Using
a 66 MHz clock, the data throughput is 1.848 Gbit/s
(231 Mbytes/s).
The multiplexing of the data lines provides a substantial
cable reduction. Long distance parallel single-ended buses
typically require a ground wire per active signal (and have
very limited noise rejection capability). Thus, for a 28-bit wide
data bus and one clock, up to 58 conductors are required.
With the Channel Link chipset as few as 11 conductors (4
data pairs, 1 clock pair and a minimum of one ground) are
needed. This provides a 80% reduction in required cable
Block Diagrams
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
See NS Package Number MTD56
Order Number DS90CR283MTD
DS90CR283
DS012889
DS012889-27
width, which provides a system cost savings, reduces con-
nector physical size and cost, and reduces shielding require-
ments due to the cables’ smaller form factor.
The 28 CMOS/TTL inputs can support a variety of signal
combinations. For example, 7 4-bit nibbles or 3 9-bit (byte +
parity) and 1 control.
Features
n 66 MHz clock support
n Up to 231 Mbytes/s bandwidth
n Low power CMOS design (
n Power Down mode (
n Up to 1.848 Gbit/s data throughput
n Narrow bus reduces cable size and cost
n 290 mV swing LVDS devices for low EMI
n PLL requires no external components
n Low profile 56-lead TSSOP package
n Rising edge data strobe
n Compatible with TIA/EIA-644 LVDS Standard
See NS Package Number MTD56
Order Number DS90CR284MTD
<
DS90CR284
0.5 mW total)
<
610 mW)
www.national.com
DS012889-1
July 1997

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DS90CR283MTD Summary of contents

Page 1

... With the Channel Link chipset as few as 11 conductors (4 data pairs, 1 clock pair and a minimum of one ground) are needed. This provides a 80% reduction in required cable Block Diagrams DS90CR283 Order Number DS90CR283MTD See NS Package Number MTD56 TRI-STATE ® registered trademark of National Semiconductor Corporation. ...

Page 2

Pin Diagrams DS90CR283 Typical Application www.national.com DS90CR284 DS012889-21 2 DS012889-22 DS012889-23 ...

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 −0. CMOS/TTL Ouput Voltage −0. LVDS Receiver ...

Page 4

Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified Symbol Parameter RECEIVER SUPPLY CURRENT I Receiver Supply Current, CCRW Worst Case I Receiver Supply Current, CCRZ Power Down Note 1: “Absolute Maximum Ratings” are those values beyond ...

Page 5

Receiver Switching Characteristics Over recommended operating supply and temperature ranges unless otherwise specified Symbol Parameter CLHT CMOS/TTL Low-to-High Transition Time ( Figure 3 ) CMOS/TTL High-to-Low Transition Time ( Figure 3 ) CHLT RSKM RxIN Skew Margin (Note 7), = ...

Page 6

AC Timing Diagrams (Continued) FIGURE 4. DS90CR283 (Transmitter) Input Clock Transition Time = 0V Note 8: Measurements at V diff Note 9: TCCS measured between earliest and latest initial LVDS edges. Note 10: TxCLK OUT Differential Low High Edge FIGURE ...

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AC Timing Diagrams (Continued) FIGURE 8. DS90CR283 (Transmitter) Clock In to Clock Out Delay FIGURE 9. DS90CR284 (Receiver) Clock In to Clock Out Delay FIGURE 10. DS90CR283 (Transmitter) Phase Lock Loop Set Time FIGURE 11. DS90CR284 (Receiver) Phase Lock Loop ...

Page 8

AC Timing Diagrams (Continued) FIGURE 12. Seven Bits of LVDS in One Clock Cycle FIGURE 13. 28 Parallel TTL Data Inputs Mapped to LVDS Outputs (DS90CR283) www.national.com FIGURE 14. Transmitter Powerdown Delay FIGURE 15. Receiver Powerdown Delay 8 DS012889-15 DS012889-16 ...

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AC Timing Diagrams (Continued) FIGURE 16. Transmitter LVDS Output Pulse Position Measurement SW — Setup and Hold Time (Internal data sampling window) TCCS — Transmitter Output Skew RSKM Cable Skew (type, length) + Source Clock Jitter (cycle to cycle) Cable ...

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DS90CR283 Pin Description — Channel Link Transmitter Pin Name I/O No. TxIN I 28 TTL Level inputs TxOUT Positive LVDS differential data output TxOUT− Negative LVDS differential data output TxCLK TTL level clock ...

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Applications Information (Continued) plications include flat ribbon, flex, twisted pair and Twin-Coax. All are available in a variety of configurations and options. Flat ribbon cable, flex and twisted pair generally per- form well in short point-to-point applications while Twin-Coax is ...

Page 12

Applications Information FIGURE 19. CHANNEL LINK Decoupling Configuration CLOCK JITTER: The CHANNEL LINK devices employ a PLL to generate and recover the clock transmitted across the LVDS interface. The width of each bit in the serialized LVDS data stream is ...

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13 ...

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... Physical Dimensions inches (millimeters) unless otherwise noted 56-Lead Molded Thin Shrink Small Outline Package, JEDEC Order Number DS90CR283MTD or DS90CR284MTD LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION ...

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