Product Folder Sample & Buy Support & Community Tools & Software Technical Documents DS90LV047A SNLS044D - MAY 2000 - REVISED JULY 2016 DS90LV047A 3-V LVDS Quad CMOS Differential Line Driver 1 Features 3 Description * * * * * * * * * * The DS90LV047A device is a quad CMOS flowthrough differential line driver designed for applications requiring ultra-low power dissipation and high data rates. The device is designed to support data rates in excess of 400 Mbps (200 MHz) using Low Voltage Differential Signaling (LVDS) technology. 1 * * * >400-Mbps (200 MHz) Switching Rates Flow-Through Pinout Simplifies PCB Layout 300-ps Typical Differential Skew 400-ps Maximum Differential Skew 1.7-ns Maximum Propagation Delay 3.3-V Power Supply Design 350-mV Differential Signaling Low Power Dissipation (13 mW at 3.3-V Static) Interoperable With Existing 5-V LVDS Receivers High impedance on LVDS Outputs on Power Down Conforms to TIA/EIA-644 LVDS Standard Industrial Operating Temperature Range (-40C to +85C) Available in Surface Mount SOIC and Low Profile TSSOP Package 2 Applications * * Multifunction Printers LVDS - LVCMOS Translation The DS90LV047A accepts low voltage TTL/CMOS input levels and translates them to low voltage (350 mV) differential output signals. In addition, the driver supports a TRI-STATE function that may be used to disable the output stage, disabling the load current, and thus dropping the device to an ultra low idle power state of 13 mW typical. The DS90LV047A has a flow-through pinout for easy PCB layout. The EN and EN* inputs are ANDed together and control the TRI-STATE outputs. The enables are common to all four drivers. The DS90LV047A and companion line receiver (DS90LV048A) provide a new alternative to high power psuedo-ECL devices for high speed point-to-point interface applications. Device Information(1) PART NUMBER DS90LV048A PACKAGE BODY SIZE (NOM) SOIC (16) 9.90 mm x 3.91 mm TSSOP (16) 5.00 mm x 4.40 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Functional Diagram 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. DS90LV047A SNLS044D - MAY 2000 - REVISED JULY 2016 www.ti.com Table of Contents 1 2 3 4 5 6 7 8 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 3 6.1 6.2 6.3 6.4 6.5 6.6 6.7 3 4 4 4 4 5 6 Absolute Maximum Ratings ...................................... ESD Ratings.............................................................. Recommended Operating Conditions....................... Thermal Information .................................................. Electrical Characteristics .......................................... Switching Characteristics ......................................... Typical Characteristics .............................................. Parameter Measurement Information .................. 8 Detailed Description ............................................ 11 8.1 Overview ................................................................. 11 8.2 Functional Block Diagram ....................................... 12 8.3 Feature Description................................................. 12 8.4 Device Functional Modes........................................ 13 9 Application and Implementation ........................ 14 9.1 Application Information............................................ 14 9.2 Typical Application ................................................. 14 10 Power Supply Recommendations ..................... 16 11 Layout................................................................... 16 11.1 Layout Guidelines ................................................. 16 11.2 Layout Example .................................................... 17 12 Device and Documentation Support ................. 18 12.1 12.2 12.3 12.4 12.5 12.6 Documentation Support ........................................ Receiving Notification of Documentation Updates Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 18 18 18 18 18 18 13 Mechanical, Packaging, and Orderable Information ........................................................... 18 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision C (April 2013) to Revision D * Added ESD Ratings table, Thermal Information table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section....................................... 1 Changes from Revision B (April 2013) to Revision C * 2 Page Page Changed layout of National Semiconductor Data Sheet to TI format .................................................................................. 15 Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A DS90LV047A www.ti.com SNLS044D - MAY 2000 - REVISED JULY 2016 5 Pin Configuration and Functions D or PW Package 16-Pin SOIC or TSSOP Top View Pin Functions PIN NAME I/O NO. DIN DESCRIPTION 2, 3, 6, 7 I Driver input pin, TTL/CMOS compatible DOUT+ 10, 11, 14, 15 O Non-inverting driver output pin, LVDS levels DOUT- 9, 12, 13, 16 O Inverting driver output pin, LVDS levels EN 1 I Driver enable pin: When EN is low, the driver is disabled. When EN is high and EN* is low or open, the driver is enabled. If both EN and EN* are open circuit, then the driver is disabled. EN* 8 I Driver enable pin: When EN* is high, the driver is disabled. When EN* is low or open and EN is high, the driver is enabled. If both EN and EN* are open circuit, then the driver is disabled. GND 5 -- Ground pin VCC 4 -- Power supply pin, +3.3 V 0.3 V 6 Specifications 6.1 Absolute Maximum Ratings See (1) MIN MAX UNIT Supply voltage (VCC) -0.3 4 V Input voltage (DIN) -0.3 VCC + 0.3 V Enable input voltage (EN, EN*) -0.3 VCC + 0.3 V Output voltage (DOUT+, DOUT-) -0.3 3.9 V Short-circuit duration Maximum package power dissipation at +25C Lead temperature (DOUT+, DOUT-) Continuous D0016A package 1088 PW0016A package 866 Derate D0016A package above +25C 8.5 Derate PW0016A package above +25C 6.9 Soldering (4 s) Maximum junction temperature -65 Storage temperature, Tstg (1) mW mW/C 260 C 150 C 150 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A 3 DS90LV047A SNLS044D - MAY 2000 - REVISED JULY 2016 www.ti.com 6.2 ESD Ratings VALUE Electrostatic discharge (1) V(ESD) (1) Human-body model (HBM) 10000 Machine Model 1200 UNIT V ESD Ratings: HBM (1.5 k, 100 pF) EIAJ (0 , 200 pF) 6.3 Recommended Operating Conditions Supply voltage, VCC Operating free air temperature, TA MIN NOM MAX 3 3.3 3.6 UNIT V -40 25 85 C 6.4 Thermal Information DS90LV047A THERMAL METRIC (1) PW (TSSOP) UNIT 16 PINS RJA Junction-to-ambient thermal resistance 114 C/W RJC(top) Junction-to-case (top) thermal resistance 51 C/W RJB Junction-to-board thermal resistance 59 C/W JT Junction-to-top characterization parameter 8 C/W JB Junction-to-board characterization parameter 58 C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. 6.5 Electrical Characteristics Over supply voltage and operating temperature ranges, unless otherwise specified (1) (2) (3) PARAMETER TEST CONDITIONS VOD1 Differential output voltage VOD1 Change in magnitude of VOD1 for complementary output states VOS Offset voltage VOS Change in magnitude of VOS for complementary output states VOH Output high voltage VOL Output low voltage VIH Input high voltage VIL Input low voltage IIH Input high current VIN = VCC or 2.5 V IIL Input low current VIN = GND or 0.4 V VCL Input clamp voltage ICL = -18 mA (1) (2) (3) 4 RL = 100 (Figure 17) PIN DOUT- DOUT+ MIN TYP MAX UNIT 250 310 450 mV 1 35 |mV| 1.17 1.375 1 25 |mV| 1.33 1.6 V 1.125 0.9 DIN, EN, EN* 1.02 V V 2 VCC V GND 0.8 V -10 2 +10 A -10 -2 +10 A -1.5 -0.8 V Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except: VOD1 and VOD1. All typicals are given for: VCC = 3.3 V, TA = +25C. The DS90LV047A is a current mode device and only functions within datasheet specifications when a resistive load is applied to the driver outputs typical range is (90 to 110 ). Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A DS90LV047A www.ti.com SNLS044D - MAY 2000 - REVISED JULY 2016 Electrical Characteristics (continued) Over supply voltage and operating temperature ranges, unless otherwise specified(1)(2)(3) PARAMETER TEST CONDITIONS IOS Output short-circuit current (4) ENABLED, DIN = VCC, DOUT+ = 0 V or DIN = GND, DOUT- = 0 V IOSD Differential output short-circuit current (4) ENABLED, VOD = 0 V IOFF Power-off leakage VOUT = 0 V or 3.6 V, VCC = 0 V or Open IOZ Output TRI-STATE current EN = 0.8 V and EN* = 2.0 V VOUT = 0 V or VCC ICC No load supply current drivers enabled DIN = VCC or GND ICCL RL = 100 all channels, DIN = VCC Loaded supply current drivers enabled or GND (all inputs) ICCZ No load supply current drivers disabled (4) PIN MIN TYP MAX -4.2 -9 mA -4.2 -9 mA -20 1 20 A -10 1 10 A 4 8 mA 20 30 mA 2.2 6 mA MIN TYP MAX DOUT- DOUT+ VCC DIN = VCC or GND, EN = GND, EN* = VCC UNIT Output short circuit current (IOS) is specified as magnitude only, minus sign indicates direction only. 6.6 Switching Characteristics VCC = +3.3V 10%, TA = -40C to +85C (1) (2) (3) PARAMETER TEST CONDITIONS UNIT tPHLD Differential propagation delay high to low 0.5 0.9 1.7 ns tPLHD Differential propagation delay low to high 0.5 1.2 1.7 ns tSKD1 Differential pulse skew |tPHLD - tPLHD| (4) 0 0.3 0.4 ns tSKD2 Channel-to-channel skew (5) 0 0.4 0.5 ns tSKD3 Differential part-to-part skew (6) 0 1 ns tSKD4 Differential part-to-part skew (7) 0 1.2 ns tTLH Rise time 0.5 1.5 ns tTHL Fall time 0.5 1.5 ns tPHZ Disable time high to Z 2 5 ns tPLZ Disable time low to Z 2 5 ns tPZH Enable time Z to high 3 7 ns tPZL Enable time Z to low 3 7 ns fMAX (1) (2) (3) (4) (5) (6) (7) (8) Maximum operating frequency RL = 100 , CL = 15 pF (Figure 18 and Figure 19) RL = 100 , CL = 15 pF (Figure 20 and Figure 21) (8) 200 250 MHz All typicals are given for: VCC = 3.3 V, TA = +25C. Generator waveform for all tests unless otherwise specified: f = 1 MHz, ZO = 50 , tr 1 ns, and tf 1 ns. CL includes probe and jig capacitance. tSKD1 |tPHLD - tPLHD| is the magnitude difference in differential propagation delay time between the positive going edge and the negative going edge of the same channel. tSKD2 is the differential channel-to-channel skew of any event on the same device. tSKD3, differential part-to-part skew, is defined as the difference between the minimum and maximum specified differential propagation delays. This specification applies to devices at the same VCC and within 5C of each other within the operating temperature range. tSKD4, part to part skew, is the differential channel-to-channel skew of any event between devices. This specification applies to devices over recommended operating temperature and voltage ranges, and across process distribution. tSKD4 is defined as |Max - Min| differential propagation delay. fMAX generator input conditions: tr = tf < 1 ns (0% to 100%), 50% duty cycle, 0 V to 3 V. Output criteria: duty cycle = 45% / 55%, VOD > 250 mV, all channels switching. Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A 5 DS90LV047A SNLS044D - MAY 2000 - REVISED JULY 2016 www.ti.com 6.7 Typical Characteristics 6 Figure 1. Output High Voltage vs Power Supply Voltage Figure 2. Output Low Voltage vs Power Supply Voltage Figure 3. Output Short Circuit Current vs Power Supply Voltage Figure 4. Output TRI-STATE Current vs Power Supply Voltage Figure 5. Differential Output Voltage vs Power Supply Voltage Figure 6. Differential Output Voltage vs Load Resistor Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A DS90LV047A www.ti.com SNLS044D - MAY 2000 - REVISED JULY 2016 Typical Characteristics (continued) Figure 7. Offset Voltage vs Power Supply Voltage Figure 8. Power Supply Current vs Power Supply Voltage Figure 9. Power Supply Current vs Ambient Temperature Figure 10. Differential Propagation Delay vs Power Supply Voltage Figure 11. Differential Propagation Delay vs Ambient Temperature Figure 12. Differential Skew vs Power Supply Voltage Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A 7 DS90LV047A SNLS044D - MAY 2000 - REVISED JULY 2016 www.ti.com Typical Characteristics (continued) Figure 13. Differential Skew vs Ambient Temperature Figure 14. Transition Time vs Power Supply Voltage Figure 15. Transition Time vs Ambient Temperature Figure 16. Data Rate vs Cable Length 7 Parameter Measurement Information Figure 17. Driver VOD and VOS Test Circuit 8 Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A DS90LV047A www.ti.com SNLS044D - MAY 2000 - REVISED JULY 2016 Parameter Measurement Information (continued) Figure 18. Driver Propagation Delay and Transition Time Test Circuit Figure 19. Driver Propagation Delay and Transition Time Waveforms Figure 20. Driver TRI-STATE Delay Test Circuit Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A 9 DS90LV047A SNLS044D - MAY 2000 - REVISED JULY 2016 www.ti.com Parameter Measurement Information (continued) Figure 21. Driver TRI-STATE Delay Waveform 10 Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A DS90LV047A www.ti.com SNLS044D - MAY 2000 - REVISED JULY 2016 8 Detailed Description 8.1 Overview LVDS drivers and receivers are intended to be primarily used in an uncomplicated point-to-point configuration as is shown in Figure 23. This configuration provides a clean signaling environment for the fast edge rates of the drivers. The receiver is connected to the driver through a balanced media which may be a standard twisted pair cable, a parallel pair cable, or simply PCB traces. Typically, the characteristic differential impedance of the media is in the range of 100 . A termination resistor of 100 (selected to match the media), and is located as close to the receiver input pins as possible. The termination resistor converts the driver output current (current mode) into a voltage that is detected by the receiver. Other configurations are possible such as a multi-receiver configuration, but the effects of a mid-stream connector(s), cable stub(s), and other impedance discontinuities as well as ground shifting, noise margin limits, and total termination loading must be taken into account. The DS90LV047A differential line driver is a balanced current source design. A current mode driver, generally speaking has a high output impedance and supplies a constant current for a range of loads (a voltage mode driver on the other hand supplies a constant voltage for a range of loads). Current is switched through the load in one direction to produce a logic state and in the other direction to produce the other logic state. The output current is typically 3.1 mA, a minimum of 2.5 mA, and a maximum of 4.5 mA. The current mode driver requires (as discussed above) that a resistive termination be employed to terminate the signal and to complete the loop as shown in Figure 23. AC or unterminated configurations are not allowed. The 3.1-mA loop current develops a differential voltage of 310 mV across the 100- termination resistor which the receiver detects with a 250-mV minimum differential noise margin, (driven signal minus receiver threshold (250 mV - 100 mV = 150 mV). The signal is centered around +1.2 V (Driver Offset, VOS) with respect to ground as shown in Figure 22. NOTE The steady-state voltage (VSS) peak-to-peak swing is twice the differential voltage (VOD) and is typically 620 mV. The current mode driver provides substantial benefits over voltage mode drivers, such as an RS-422 driver. Its quiescent current remains relatively flat versus switching frequency. Whereas the RS-422 voltage mode driver increases exponentially in most case from 20 MHz to 50 MHz. This is due to the overlap current that flows between the rails of the device when the internal gates switch. Whereas the current mode driver switches a fixed current between its output without any substantial overlap current. This is similar to some ECL and PECL devices, but without the heavy static ICC requirements of the ECL/PECL designs. LVDS requires > 80% less current than similar PECL devices. AC specifications for the driver are a tenfold improvement over other existing RS-422 drivers. The TRI-STATE function allows the driver outputs to be disabled, thus obtaining an even lower power state when the transmission of data is not required. Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A 11 DS90LV047A SNLS044D - MAY 2000 - REVISED JULY 2016 www.ti.com 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 LVDS Fail-Safe This section addresses the common concern of fail-safe biasing of LVDS interconnects, specifically looking at the DS90LV047A driver outputs and the DS90LV048A receiver inputs. The LVDS receiver is a high-gain, high-speed device that amplifies a small differential signal (20 mV) to CMOS logic levels. Due to the high gain and tight threshold of the receiver, take care to prevent noise from appearing as a valid signal. The internal fail-safe circuitry of the receiver is designed to source or sink a small amount of current, providing fail-safe protection (a stable known state of HIGH output voltage) for floating, terminated, or shorted receiver inputs. 1. Open Input Pins. The DS90LV048A is a quad receiver device, and if an application requires only 1, 2, or 3 receivers, the unused channel(s) inputs must be left OPEN. Do not tie unused receiver inputs to ground or any other voltages. The input is biased by internal high value pullup and pulldown resistors to set the output to a HIGH state. This internal circuitry ensures a HIGH, stable output state for open inputs. 2. Terminated Input. If the DS90LV047A driver is disconnected (cable unplugged), or if the DS90LV047A driver is in a TRI-STATE or power-off condition, the receiver output is again in a HIGH state, even with the end of cable 100- termination resistor across the input pins. The unplugged cable can become a floating antenna which can pick up noise. If the cable picks up more than 10 mV of differential noise, the receiver may see the noise as a valid signal and switch. To insure that any noise is seen as common-mode and not differential, a balanced interconnect must be used. Twisted pair cable offers better balance than flat ribbon cable. 3. Shorted Inputs. If a fault condition occurs that shorts the receiver inputs together, thus resulting in a 0-V differential input voltage, the receiver output remains in a HIGH state. Shorted input fail-safe is not supported across the common-mode range of the device (GND to 2.4 V). It is only supported with inputs shorted and no external common-mode voltage applied. 12 Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A DS90LV047A www.ti.com SNLS044D - MAY 2000 - REVISED JULY 2016 Feature Description (continued) External lower value pullup and pulldown resistors (for a stronger bias) may be used to boost fail-safe in the presence of higher noise levels. The pullup and pulldown resistors should be in the 5-k to 15-k range to minimize loading and waveform distortion to the driver. The common-mode bias point should be set to approximately 1.2 V (less than 1.75 V) to be compatible with the internal circuitry. Figure 22. Driver Output Levels 8.4 Device Functional Modes Table 1 lists the functional modes DS90LV047A. Table 1. Truth Table ENABLES EN H INPUT EN* L or Open All other combinations of ENABLE inputs OUTPUTS DIN DOUT+ DOUT- L L H H H L X Z Z Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A 13 DS90LV047A SNLS044D - MAY 2000 - REVISED JULY 2016 www.ti.com 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI's customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information The DS90LV047A has a flow-through pinout that allows for easy PCB layout. The LVDS signals on one side of the device easily allows for matching electrical lengths of the differential pair trace lines between the driver and the receiver as well as allowing the trace lines to be close together to couple noise as common-mode. Noise isolation is achieved with the LVDS signals on one side of the device and the TTL signals on the other side. 9.2 Typical Application Figure 23. Point-to-Point Application 9.2.1 Design Requirements When using LVDS devices, it is important to remember to specify controlled impedance PCB traces, cable assemblies, and connectors. All components of the transmission media should have a matched differential impedance of about 100 . They should not introduce major impedance discontinuities. Balanced cables (for example, twisted pair) are usually better than unbalanced cables (ribbon cable) for noise reduction and signal quality. Balanced cables tend to generate less EMI due to field canceling effects and also tend to pick up electromagnetic radiation as common-mode (not differential mode) noise which is rejected by the LVDS receiver. For cable distances < 0.5 M, most cables can be made to work effectively. For distances 0.5 M d 10 M, CAT5 (Category 5) twisted pair cable works well, is readily available and relatively inexpensive. 9.2.2 Detailed Design Procedure 9.2.2.1 Probing LVDS Transmission Lines Always use high impedance (> 100 k), low capacitance (< 2 pF) scope probes with a wide bandwidth (1 GHz) scope. Improper probing gives deceiving results. 9.2.2.2 Data Rate vs Cable Length Graph Test Procedure A pseudo-random bit sequence (PRBS) of 29-1 bits was programmed into a function generator (Tektronix HFS9009) and connected to the driver inputs through 50- cables and SMB connectors. An oscilloscope (Tektronix 11801B) was used to probe the resulting eye pattern, measured differentially at the input to the receiver. A 100- resistor was used to terminate the pair at the far end of the cable. The measurements were taken at the far end of the cable, at the input of the receiver, and used for the jitter analysis for this graph (Figure 16). The frequency of the input signal was increased until the measured jitter (ttcs) equaled 20% with respect to the unit interval (ttui) for the particular cable length under test. Twenty percent jitter is a reasonable place to start with many system designs. The data used was NRZ. Jitter was measured at the 0-V differential voltage of the differential eye pattern. The DS90LV047A and DS90LV048A can be evaluated using the new DS90LV047-048AEVM. 14 Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A DS90LV047A www.ti.com SNLS044D - MAY 2000 - REVISED JULY 2016 Typical Application (continued) Figure 24 shows very good typical performance that can be used as a design guideline for data rate vs cable length. Increasing the jitter percentage increases the curve respectively, allowing the device to transmit faster over longer cable lengths. This relaxes the jitter tolerance of the system allowing more jitter into the system, which could reduce the reliability and efficiency of the system. Alternatively, decreasing the jitter percentage has the opposite effect on the system. The area under the curve is considered the safe operating area based on the above signal quality criteria. For more information on eye pattern testing, please see AN-808 Long Transmission Lines and Data Signal Quality (SNLA028). 9.2.3 Application Curve Figure 24. Power Supply Current vs Frequency Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A 15 DS90LV047A SNLS044D - MAY 2000 - REVISED JULY 2016 www.ti.com 10 Power Supply Recommendations Although the DS90LV047A draws very little power while at rest. At higher switching frequencies there is a dynamic current component which increases the overall power consumption. The DS90LV047A power supply connection must take this additional current consumption into consideration for maximum power requirements. 11 Layout 11.1 Layout Guidelines * * * Use at least 4 PCB layers (top to bottom); LVDS signals, ground, power, TTL signals. Isolate TTL signals from LVDS signals, otherwise the TTL may couple onto the LVDS lines. It is best to put TTL and LVDS signals on different layers which are isolated by a power/ground plane(s). Keep drivers and receivers as close to the (LVDS port side) connectors as possible. 11.1.1 Power Decoupling Recommendations Bypass capacitors must be used on power pins. Use high frequency ceramic (surface mount is recommended) 0.1-F and 0.001-F capacitors in parallel at the power supply pin with the smallest value capacitor closest to the device supply pin. Additional scattered capacitors over the printed-circuit board improves decoupling. Multiple vias must be used to connect the decoupling capacitors to the power planes. A 10-F (35-V) or greater solid tantalum capacitor must be connected at the power entry point on the printed-circuit board between the supply and ground. 11.1.2 Differential Traces Use controlled impedance traces which match the differential impedance of your transmission medium (that is, cable) and termination resistor. Run the differential pair trace lines as close together as possible as soon as they leave the IC (stubs must be < 10 mm long). This helps eliminate reflections and ensure noise is coupled as common-mode. In fact, we have seen that differential signals which are 1 mm apart radiate far less noise than traces 3 mm apart since magnetic field cancellation is much better with the closer traces. In addition, noise induced on the differential lines is much more likely to appear as common-mode which is rejected by the receiver. Match electrical lengths between traces to reduce skew. Skew between the signals of a pair means a phase difference between signals, which destroys the magnetic field cancellation benefits of differential signals and EMI, results. NOTE The velocity of propagation, v = c/Er where c (the speed of light) = 0.2997mm/ps or 0.0118 in/ps Do not rely solely on the autoroute function for differential traces. Carefully review dimensions to match differential impedance and provide isolation for the differential lines. Minimize the number or vias and other discontinuities on the line. Avoid 90 turns (these cause impedance discontinuities). Use arcs or 45 bevels. Within a pair of traces, the distance between the two traces must be minimized to maintain common-mode rejection of the receivers. On the printed-circuit board, this distance must remain constant to avoid discontinuities in differential impedance. Minor violations at connection points are allowable. 11.1.3 Termination Use a termination resistor which best matches the differential impedance or your transmission line. The resistor must be between 90 and 130 . Remember that the current mode outputs need the termination resistor to generate the differential voltage. LVDS does not work without resistor termination. Typically, connecting a single resistor across the pair at the receiver end will suffice. 16 Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A DS90LV047A www.ti.com SNLS044D - MAY 2000 - REVISED JULY 2016 Layout Guidelines (continued) Surface mount 1% to 2% resistors are best. PCB stubs, component lead, and the distance from the termination to the receiver inputs must be minimized. The distance between the termination resistor and the receiver should be < 10 mm (12 mm maximum). 11.2 Layout Example DS90LV048A DS90LV047A LVCMOS Inputs 1 EN DOUT1- 16 1 RIN1- EN 16 2 DIN1 DOUT1+ 15 2 RIN1+ ROUT1 15 3 DIN2 DOUT2+ 14 3 RIN2+ ROUT2 14 4 VCC DOUT2- 13 4 RIN2- VCC 13 5 GND DOUT3- 12 5 RIN3- GND 12 6 DIN3 DOUT3+ 11 6 RIN3+ ROUT3 11 RIN4+ ROUT4 10 RIN4- EN* 9 Series Termination (optional) LVCMOS Outputs Decoupling Cap Decoupling Cap 7 DIN4 DOUT4+ 10 7 8 EN* DOUT4- 9 8 Series Termination (optional) Input Termination (Required) Figure 25. Layout Recommendation Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A 17 DS90LV047A SNLS044D - MAY 2000 - REVISED JULY 2016 www.ti.com 12 Device and Documentation Support 12.1 Documentation Support 12.1.1 Related Documentation For related documentation, see the following: * LVDS Owner's Manual (SNLA187) * AN-808 Long Transmission Lines and Data Signal Quality (SNLA028) * AN-977 LVDS Signal Quality: Jitter Measurements Using Eye Patterns Test Report #1 (SNLA166) * AN-971 An Overview of LVDS Technology (SNLA165) * AN-916 A Practical Guide to Cable Selection (SNLA219) * AN-805 Calculating Power Dissipation for Differential Line Drivers (SNOA233) * AN-903 A Comparison of Differential Termination Techniques (SNLA034) * AN-1194 Failsafe Biasing of LVDS Interfaces (SNLA051) 12.2 Receiving Notification of Documentation Updates To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document. 12.3 Community Resources The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TI E2ETM Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support. 12.4 Trademarks E2E is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. 12.5 Electrostatic Discharge Caution These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 12.6 Glossary SLYZ022 -- TI Glossary. This glossary lists and explains terms, acronyms, and definitions. 13 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. 18 Submit Documentation Feedback Copyright (c) 2000-2016, Texas Instruments Incorporated Product Folder Links: DS90LV047A PACKAGE OPTION ADDENDUM www.ti.com 4-Nov-2016 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (C) Device Marking (4/5) DS90LV047ATM NRND SOIC D 16 48 TBD Call TI Call TI -40 to 85 DS90LV047A TM DS90LV047ATM/NOPB ACTIVE SOIC D 16 48 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 DS90LV047A TM DS90LV047ATMTC NRND TSSOP PW 16 92 TBD Call TI Call TI -40 to 85 DS90LV 047AT DS90LV047ATMTC/NOPB ACTIVE TSSOP PW 16 92 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 DS90LV 047AT DS90LV047ATMTCX/NOPB ACTIVE TSSOP PW 16 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 DS90LV 047AT DS90LV047ATMX/NOPB ACTIVE SOIC D 16 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 DS90LV047A TM (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 4-Nov-2016 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 10-Aug-2016 TAPE AND REEL INFORMATION *All dimensions are nominal Device DS90LV047ATMTCX/NO PB DS90LV047ATMX/NOPB Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TSSOP PW 16 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 SOIC D 16 2500 330.0 16.4 6.5 10.3 2.3 8.0 16.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 10-Aug-2016 *All dimensions are nominal Device DS90LV047ATMTCX/NOP B DS90LV047ATMX/NOPB Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TSSOP PW 16 2500 367.0 367.0 35.0 SOIC D 16 2500 367.0 367.0 35.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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