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90CR283 Datasheet


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90CR283 pdf
July 2001
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
parallel 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
www.DataSheet4U.caotmransmit clock frequency of 66 MHz, 28 bits of TTL data are
transmitted 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
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.
n 66 MHz clock support
n Up to 231 Mbytes/s bandwidth
n Low power CMOS design (< 610 mW)
n Power Down mode (< 0.5 mW total)
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
Block Diagrams
Order Number DS90CR283MTD
See NS Package Number MTD56
Order Number DS90CR284MTD
See NS Package Number MTD56
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 2001 National Semiconductor Corporation DS012889
National Semiconductor
National Semiconductor

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