Description
DS90CR215MTDX/NOPB Texas Instruments LVDS Interface IC 3.3V Rising Edge Data Strobe LVDS 48-Pin TSSOP
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.
Key Features
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: -40C to +85C
Technical Attributes
Description
Value
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Transmission Data Rate
1386 Mbps
Maximum Differential Output Voltage
0.45 V
Input Type
CMOS|TTL
Number of Elements per Chip
3
Differential Input High Threshold Voltage
0.1 V
Maximum Input Current
10 uA
Lead Finish
Tin
Max Processing Temp
260
Number of Receivers
21
Typical Operating Supply Voltage
3.3 V
Maximum Power Dissipation
1980 mW
Differential Input Low Threshold Voltage
-0.1 V
Minimum Operating Supply Voltage
3 V
Mounting
Surface Mount
Maximum Operating Supply Voltage
3.6 V
Number of Drivers
3
Operating Temperature
-40 to 85 C
Manufacturer Part Number: DS90CR215MTDX/NOPB
Manufacturer: Texas Instruments
