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FEATURES

? 20 to 85 MHz Shift Clock Support

? 50% Duty Cycle on Receiver Output Clock

? 2.5 / 0 ns Set & Hold Times on TxINPUTs

? Low Power Consumption

? ±1V Common-Mode Range (around +1.2V)

? Narrow Bus Reduces Cable Size and Cost

? Up to 2.38 Gbps Throughput

? Up to 297.5 Mbytes/sec Bandwidth

? 345 mV (typ) Swing LVDS Devices for Low EMI

? PLL Requires no External Components

? Rising Edge Data Strobe

? Compatible with TIA/EIA-644 LVDS Standard

? Low Profile 56-Lead TSSOP Package

DESCRIPTION

The DS90CR287 transmitter converts 28 bits of

LVCMOS/LVTTL 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 DS90CR288A receiver converts the four LVDS

data streams back into 28 bits of LVCMOS/LVTTL

data. At a transmit clock frequency of 85 MHz, 28 bits

of TTL data are transmitted at a rate of 595 Mbps per

LVDS data channel. Using a 85 MHz clock, the data throughput is 2.38 Gbit/s (297.5 Mbytes/sec).

This chipset is an ideal means to solve EMI and

cable size problems associated with wide, high-speed

TTL interfaces.