1FEATURES

2• 20 to 85 MHz Shift Clock Support

• 50% Duty Cycle on Receiver Output Clock

• Best-in-Class Set & Hold Times on TxINPUTs

• Low Power Consumption

• ±1V Common-Mode Range (Around +1.2V)

• Narrow Bus Reduces Cable Size and Cost

• Up to 1.785 Gbps Throughput

• Up to 223 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 48-Lead TSSOP Package

DESCRIPTION

The DS90CR217 transmitter converts 21 bits of

CMOS/TTL data into three LVDS (Low Voltage

Differential Signaling) data streams. A phase-locked

transmit clock is transmitted in parallel with the data

streams over a fourth LVDS link. Every cycle of the

transmit clock 21 bits of input data are sampled and transmitted. At a transmit clock frequency of 85 MHz,

21 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 1.785 Gbit/s (223 Mbytes/sec).

The narrow bus and LVDS signalling of the

DS90CR217 is an ideal means to solve EMI and cable size problems associated with wide, high-speed

TTL interfaces.