DS90CR281MTDX National Semiconductor, DS90CR281MTDX Datasheet

IC TXRX 28BIT CHAN LINK 56TSSOP

DS90CR281MTDX

Manufacturer Part Number
DS90CR281MTDX
Description
IC TXRX 28BIT CHAN LINK 56TSSOP
Manufacturer
National Semiconductor
Type
Transmitterr
Datasheet

Specifications of DS90CR281MTDX

Protocol
LVDS
Voltage - Supply
4.5 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
56-TSSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Number Of Drivers/receivers
-
Other names
*DS90CR281MTDX
© 1998 National Semiconductor Corporation
DS90CR281/DS90CR282
28-Bit Channel Link
General Description
The DS90CR281 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 DS90CR282 receiver converts the LVDS
data streams back into 28 bits of CMOS/TTL data. At a trans-
mit clock frequency of 40 MHz, 28 bits of TTL data are trans-
mitted at a rate of 280 Mbps per LVDS data channel. Using
a 40 MHz clock, the data throughput is 1.12 Gbit/s
(140 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
Block Diagrams
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
See NS Package Number MTD56
Order Number DS90CR281MTD
DS90CR281
DS012638
DS012638-27
ground) are needed. This provides a 80% reduction in re-
quired cable width, which provides a system cost savings,
reduces connector physical size and cost, and reduces
shielding requirements due to the cables’ smaller form fac-
tor.
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 Narrow bus reduces cable size and cost
n
n 290 mV swing LVDS data transmission
n 1.12 Gbit/s data throughput
n Low swing differential current mode drivers reduce EMI
n Rising edge data strobe
n Power down mode
n Offered in low profile 56-lead TSSOP package
±
1V common mode range (ground shifting)
See NS Package Number MTD56
Order Number DS90CR282MTD
DS90CR282
www.national.com
DS012638-1
July 1997

Related parts for DS90CR281MTDX

DS90CR281MTDX Summary of contents

Page 1

... DS90CR281 Order Number DS90CR281MTD See NS Package Number MTD56 TRI-STATE ® registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS012638 ground) are needed. This provides a 80% reduction in re- quired cable width, which provides a system cost savings, reduces connector physical size and cost, and reduces shielding requirements due to the cables’ ...

Page 2

Connection Diagrams DS90CR281 Typical Application www.national.com DS012638-2 2 DS90CR282 DS012638-3 DS012638-19 ...

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 Input Voltage −0. LVDS Driver Output Voltage −0. LVDS Output Short Circuit ...

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 CLHT CMOS/TTL Low-to-High Transition Time ( Figure 3 ) CMOS/TTL High-to-Low Transition Time ( Figure 3 ) CHLT RCOP RxCLK OUT Period ( Figure 7 ) ...

Page 6

AC Timing Diagrams (Continued) DS012638-7 FIGURE 3. DS90CR282 (Receiver) CMOS/TTL Output Load and Transition Timing FIGURE 4. DS90CR281 (Transmitter) Input Clock Transition Time = 0V Measurements at V diff = 0V Measurements at V diff TCCS measured between earliest and ...

Page 7

AC Timing Diagrams (Continued) FIGURE 7. (Receiver) DS90CR282 Setup/Hold and High/Low Times FIGURE 8. DS90CR281 (Transmitter) Clock In to Clock Out Delay FIGURE 9. DS90CR282 (Receiver) Clock In to Clock Out Delay FIGURE 10. DS90CR281 (Transmitter) Phase Lock Loop Set ...

Page 8

AC Timing Diagrams (Continued) FIGURE 11. DS90CR282 (Receiver) Phase Lock Loop Set Time FIGURE 12. Seven Bits of LVDS in One Clock Cycle FIGURE 13. 28 Parallel TTL Data Inputs Mapped to LVDS Outputs (DS90CR281) www.national.com FIGURE 14. Transmitter Powerdown ...

Page 9

AC Timing Diagrams (Continued) FIGURE 15. Receiver Powerdown Delay 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 ...

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DS90CR281 Pin Description — Channel Link Transmitter (Tx) 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 ...

Page 11

Applications Information (Continued) is good for short and long applications. When using ribbon cable recommended to place a ground line between each differential pair to act as a barrier to noise coupling be- tween adjacent pairs. For Twin-Coax ...

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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... National Semiconductor Asia Pacific Customer Fax: +49 (0) 1 80-530 85 86 Response Group Email: europe.support@nsc.com Tel: 65-2544466 Fax: 65-2504466 Tel: +49 (0) 1 80-532 78 32 Email: sea.support@nsc.com Tel: +49 (0) 1 80-534 16 80 National Semiconductor Japan Ltd. Tel: 81-3-5620-6175 Fax: 81-3-5620-6179 ...

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