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1FEATURES

2? Single +3.3V Supply

? Chipset (Tx + Rx) Power Consumption <250

mW (typ)

? Power-down Mode (<0.5 mW total)

? Up to 173 Megabytes/sec Bandwidth

? Up to 1.386 Gbps Data Throughput

? Narrow Bus Reduces Cable Size

? 290 mV Swing LVDS Devices for Low EMI

? +1V Common Mode Range (Around +1.2V)

? PLL Requires No External Components

? Low Profile 48-Lead TSSOP Package

? Rising Edge Data Strobe

? Compatible with TIA/EIA-644 LVDS Standard

? ESD Rating > 7 kV

? Operating Temperature: ?40°C to +85°C

DESCRIPTION

The DS90CR215 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. The DS90CR216 receiver converts the

LVDS data streams back into 21 bits of CMOS/TTL

data. At a transmit clock frequency of 66 MHz, 21 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 1.386 Gbit/s (173 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 21-bit wide data and one clock, up to 44 conductors are required. With the

Channel Link chipset as few as 9 conductors (3 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 connector physical size and cost, and

reduces shielding requirements due to the cables'

smaller form factor.

The 21 CMOS/TTL inputs can support a variety of

signal combinations. For example, five 4-bit nibbles

plus 1 control, or two 9-bit (byte + parity) and 3

control.