Product category: Communications ICs (Wired)
News Release from: Texas Instruments (April 2001-March 2006) | Subject: SN65MLVD20x series
Edited by the Electronicstalk Editorial Team on 23 January 2002
First multipoint-LVDS data line circuits
A new family of low-power, low-noise solutions for high-speed backplane and cable transmission of multipoint data is now available from Texas Instruments
The new devices are the industry's first family of single line transceivers, drivers and receivers compliant with the soon to be published Multipoint Low-Voltage Differential Signalling (M-LVDS) specification TIA/EIA-899. Low power and low noise characteristics make the devices appropriate for a wide range of high-speed, inter- and intra-system communications.
This article was originally published on Electronicstalk on 23 January 2002 at 8.00am (UK)
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TI's new SN65MLVD20x series of M-LVDS line circuits provide low-voltage differential signaling at speeds up to 200Mbit/s between up to 32 devices over typical distances of 30m.
Multipoint databuses can be found in industrial process control, automobiles, RAIDs, LANs, data libraries, computers, and a host of other equipment requiring data transmission between multiple nodes.
As an extension of the TIA/EIA-644 (LVDS) standard with point-to-point signalling that is already widely used for high-speed communications, the M-LVDS standard targets multipoint applications while offering the benefits of low voltage differential signalling.
Differential signalling provides for lower radiated electromagnetic emissions and susceptibility over widely used single-ended technologies such as BTL or GTL.
The lower operating voltages provide much higher speeds and lower power over 5V based differential technologies such as RS-485 and RS-422.
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'The release of the new SN65MLVD20x family shows TI's continuing leadership in pushing the speed/power envelope for data transmission', said Peter Peisker, Analog Market Development Manager for TI in Europe.
'Our customers want to increase system throughput without increasing the size of interconnects or system power consumption.
The M-LVDS compliant SN65MLVD20x family of devices does this very well'.
SN65MLVD20x drivers can drive 30ohm loads at 200Mbit/s while drawing only 19mA of current from a 3.3V supply and 63mW of power.
Controlled output voltage transitions minimise the transmission line effects of stubs and other discontinuities along the transmission path.
They also include features that allow for bus contention, live insertion, and other events common to multipoint bus applications.
The receivers of the SN65MLVD20x family feature a wide common-mode input voltage range of -1 to 3.4V and permit data transfers with a minimum ???1V of ground noise.
Current draw at 200Mbit/s is only 11mA from a 3.3V supply.
Two differential input voltage thresholds are offered.
For the maximum signal-to-noise ratio, Type-1 receivers detect differential voltages of as little as 50mV.
Type-2 receivers feature an input threshold offset by 100mV that provides a known output with no input signal present.
The first series of M-LVDS products from TI duplicate industry-standard footprints of the SN75176 transceiver and SN75ALS180 driver and receiver with other footprints currently in development.
The new SN65MLVD20x family is available now.
Samples and application notes for designing with new M-LVDS devices are available from the TI website.
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