January 30, 2001 - To meet growing demands for higher bandwidth, greater transfer rates, and lower power dissipation in backplane interface design and digital system infrastructure, National Semiconductor (NYSE:NSM) is unveiling several new high-speed LVDS (Low Voltage Differential Signaling) data transmission products at DesignCon 2001. The latest additions to National's LVDS product portfolio are focused on new performance advantages, greater levels of integration, compact package design, and on-chip test capability for telecom and datacom systems, mobile phone base stations, and Internet infrastructure equipment. LVDS technology is ideal for point-to-point and multipoint data transfer in high-speed, low-power applications with dense backplanes and cable interconnects.
Also among the products featured by National Semiconductor will be the first in a series of IEEE 1149.1 JTAG (Joint Test Action Group) compliant LVDS devices designed with boundary scan test access. Boundary Scan improves on fault coverage by providing test access to the boundaries of a chip, enabling comprehensive structural and interconnect test capability. The IEEE 1149.1 Standard defines a 4-wire digital interface to a standard test access port on each compliant device.
A new Bus LVDS performance leader shown by National at DesignCon 2001 is the highly integrated DS92LV16, a single-chip 16:1 LVDS serializer and 1:16 deserializer. The 1.28Gbps design can be used to construct 16 bi-directional point-to-point links across 2 pairs between two DS92LV16 parts. In addition to all the features of National's popular 10:1 LVDS serializer/deserializers, the DS92LV16 offers a flexible clocking scheme that allows variable input rates from 30MHz to 80MHz with a (5% clocking disparity between chips. Testability is enhanced and troubleshooting simplified by built-in local and line loopback modes that facilitate segregation of pre-specified parts of the system by the repetition of signals back to the board (local) or back to the cable or backplane (line). Less power is dissipated at termination by a single passive termination resistor, without costly cooling or termination power supply required with PECL designs. Key applications for the DS92LV16 serializer/deserializer are in the convergence of telecom and datacom equipment, such as VoIP (Voice over Internet Protocol) access multiplexers and routers. The device will also provide a flexible, low-power, low-cost serial link across cable or backplanes in base station equipment, Ethernet equipment, line card-to-switch interfaces and proprietary video/imaging systems. The DS92LV16 is housed in an 80-lead LQFP. Piece price in quantities of 1000 is $14. For more information, visit National's Web Site at http://www.national.com/pf/DS/DS92LV16.html
Demonstrating a new level of integration, the DS92LV1260 features six (6) 1:10 LVDS deserializers compacted into a single package. The new IC shrinks board space allocated to the deserializing function by more than 50%, while throttling power consumption and lowering component count. A seventh input channel, added as an alternate path to each of the deserializer inputs, provides built-in redundancy. The new IC's design tracks base station distribution of digitized data from six ADC blocks corresponding to six antenna sectors to multiple baseband-processing boards. The DS92LV1260 is also targeted for applications related to Internet Information Appliance infrastructures. The IC's next version will include a stepped-up clock rate - to 66MHz - plus JTAG and BIST, allowing the DS92LV1260 to keep pace with the faster execution requirements of third generation (3G) wireless base station design. Unit price in quantities of 1,000 is $39.80. For more information, see http://www.national.com/pf/DS/DS92LV1260.html
The DS90LV110 1:10 data distributor enables designers to extend the advantages of high-speed low-power LVDS bus technology into previously uncharted areas. By broadcasting 10 LVDS outputs from a single LVDS input, this device is especially effective in proliferating LVDS data rates in backplane designs for cellular base stations. It can also be used for distributing a high-speed clock signal throughout large systems. The DS90LV110 receiver will accept LVPECL (Low Voltage Pseudo Emitter Coupled Logic) input signals, or PECL levels with attenuation networks. But with less than 800mW power dissipation, it does not have the cooling and power supply requirements of alternative methods. 1,000-piece price in a 28-lead SSOP package is $6.00 each. For more information, visit National's web site at http://www.national.com/pf/DS/DS90LV110T.html
The CLC001, a serial digital cable driver, receives LVDS signals and outputs PECL signals over 75-ohm cables used with telecom equipment such as digital routers and distribution amplifiers for intermediate range intra- or inter-building communications. Output voltage levels are adjustable from 800mV p-p to 1,000mV p-p via a single external resistor. The device is also ideal for moving high-speed data across standard 75-ohm impedance cables used with professional VCRs and digital cameras. Operating at speeds up to 622Mbps, the CLC001 output meets the mask outlined for SDH (Synchronous Digital Hierarchy) by ITU-T G.703 specifications for telecommunications and SMPTE 259M requirements for video applications. The CLC001 is packaged in an 8-pin SOIC. Unit price is $2.00 in quantities of 1,000. To learn more, visit http://www.national.com/pf/CL/CLC001.html
Demonstrating National's package design innovation, the DS90LV001, is an LVDS buffer in a tiny 8-pin LLP (Leadless Leadframe Package). Inputs and outputs are LVDS compliant, making the device ideal for backplane signals in telecom and similar large-system applications. The LLP package - 75% smaller than the standard SOIC - can be placed on the board edge, the backplane itself or other "stub-hider" spots too small for traditional packages. Given this flexibility, system designers can shorten stub length of traces connecting the backplane transmission line to the input terminals on the tributary cards. With shorter stubs, data rates increase and overall performance improves. The wide input dynamic range of the DS90LV001 also allows acceptance of LVPECL signals, expanding the IC's potential for applications that require LVPECL to LVDS translation. Operation is up to 800 Mbps, above the standard OC12 rate of 622 Mbps used in optical systems. The 1,000-piece price is $.80 each, in either the LLP or SOIC package. For more information, visit National's web site at http://www.national.com/pf/DS/DS90LV001.html
Another new addition to the Bus LVDS family is the DS92LV040 four-channel Bus LVDS transceiver. This device includes two pairs of Bus LVDS drivers and receivers with separate control signals. This feature facilitates individual clock and data pair distribution through backplanes or cable interconnects. National developed the DS92LV040 for busing 155Mbps clock and data signals in telecom systems. The 1,000-piece price is $4.50 each, in the 44-lead LLP package. For more information, visit National's web site at http://www.national.com/pf/DS/DS92LV040A.html
Boundary Scan products to be showcased at DesignCon 2001 include the SCAN92LV090, the first 9-channel Bus LVDS transceiver with IEEE 1149.1 test access. A second LVDS technology-based product with boundary scan, the SCAN921023 and SCAN921224 serializer/deserializer chipset, will also be previewed at DesignCon 2000. This chipset adds 1149.1 (JTAG) testability by providing both the traditional EXTEST test plus an at-speed RUNBIST test. When the RUNBIST instruction is executed, the chipset will automatically synchronize and perform a Pseudo-Random Bit Sequence (PRBS) Bit Error Rate Test (BERT). The deserializer provides "test completed" and "pass/fail" flags through 1149.1 to indicate bit errors are less than 10-7. Since the SCAN921023/1224 create a very high speed interconnect, RUNBIST is needed to check for faults (e.g. capacitance) that would otherwise not be caught using EXTEST alone. The SCAN chipsets advance the trend to high-speed data transfer over differential wiring while lowering overall system costs of base stations for 3G mobile phones/appliances. For more information see http://www.national.com/scan
and http://www.national.com/appinfo/lvds/
About National Semiconductor
National Semiconductor is the premier analog company driving the information age. Combining real-world analog and state-of-the-art digital technology, the company is focused on the fast growing markets for wireless handsets; information appliances; information infrastructure; and display, imaging and human interface technologies. With headquarters in Santa Clara, California, National reported sales of $2.1 billion for its last fiscal year and has about 10,500 employees worldwide. Additional company and product information is available on the World Wide Web at www.national.com.
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