SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 QUAD HIGH-SPEED DIFFERENTIAL RECEIVERS FEATURES * * * * * * DESCRIPTION Meets or Exceeds the Requirements of ANSI TIA/EIA-644A Standard Single-Channel Signaling Rates up to 560 Mbps -4 V to 5 V Common-Mode Input Voltage Range Flow-Through Architecture Active Failsafe Assures a High-level Output When an Input Signal Is not Present SN65LVDS348 Provides a Wide CommonMode Range Replacement for the SN65LVDS048A or the DS90LV048A APPLICATIONS * * * * * Logic Level Translator Point-to-Point Baseband Data Transmission Over 100- Media ECL/PECL-to-LVTTL Conversion Wireless Base Stations Central Office or PABX Switches The SN65LVDS348, SN65LVDT348, SN65LVDS352, and SN65LVDT352 are high-speed, quadruple differential receivers with a wide common-mode input voltage range. This allows receipt of TIA/EIA-644 signals with up to 3-V of ground noise or a variety of differential and single-ended logic levels. The '348 is in a 16-pin package to match the industry-standard footprint of the DS90LV048. The '352 adds two additional VCC and GND pins in a 24-pin package to provide higher data transfer rates with multiple receivers in operation. All offer a flow-through architecture with all inputs on one side and outputs on the other to ease board layout and reduce crosstalk between receivers. LVDT versions of both integrate a 110- line termination resistor. These receivers also provide 3x the standard's minimum common-mode noise voltage tolerance. The -4 V to 5 V common-mode range allows usage in harsh operating environments or accepts LVPECL, PECL, LVECL, ECL, CMOS, and LVCMOS levels without level shifting circuitry. See the Application Information Section for more details on the ECL/PECL to LVDS interface. DATA TRANSFER RATE vs FREE-AIR TEMPERATURE 550 Timer SN65LVDS352PW LVDT Device Only Data Transfer Rate - Mxfr/s 500 450 400 SN65LVDS348PW 350 (One of Four Shown) 300 250 200 -60 215 -1 prbs NRZ, VID = 0.4 V VIC = 1.2 V, CL = 5.5 pF, 40% Open Eye 4 Receivers Switching, Input Jitter < 45 ps -40 -20 0 20 40 60 TA - Free-Air Temperature - C 80 100 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 2002-2004, Texas Instruments Incorporated SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 DESCRIPTION (CONTINUED) Precise control of the differential input voltage thresholds allows for inclusion of 50 mV of input-voltage hysteresis to improve noise rejection. The differential input thresholds are still no more than 50 mV over the full input common-mode voltage range. The receiver inputs can withstand 15 kV human-body model (HBM), with respect to ground, without damage. This provides reliability in cabled and other connections where potentially damaging noise is always a threat. The receivers also include a (patent-pending) failsafe circuit that provides a high-level output approximately 600 ns after loss of the input signal. The most common causes of signal loss are disconnected cables, shorted lines, or powered-down transmitters. This prevents noise from being received as valid data under these fault conditions. This feature may also be used for Wired-Or bus signaling. The SN65LVDT348 and SN65LVDT352 include an integrated termination resistor. This reduces board space requirements and parts count by eliminating the need for a separate termination resistor. This can also improve signal integrity at the receiver by reducing the stub length from the line termination to the receiver. The intended application of these devices and signaling technique is for point-to-point baseband data transmission over controlled impedance media of approximately 100 . The transmission media may be printed-circuit board traces, backplanes, or cables. The ultimate rate and distance of data transfer is dependent upon the attenuation characteristics of the media and the noise coupling to the environment. The SN65LVDS348, SN65LVDT348, SN65LVDS352 and SN65LVDT352 are characterized for operation from -40C to 85C. SN65LVDS348, SN65LVDT348 D or PW PACKAGE (TOP VIEW) RIN1- RIN1+ RIN2+ RIN2- RIN3- RIN3+ RIN4+ RIN4- 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 SN65LVDS352, SN65LVDT352 PW PACKAGE (TOP VIEW) EN ROUT1 ROUT2 VCC GND ROUT3 ROUT4 EN 1A 1B 2A 2B EN 1,2 VCCA AGND EN 3,4 3A 3B 4A 4B 1 2 3 4 5 6 7 8 9 10 11 12 NC - No internal connection 2 Submit Documentation Feedback 24 23 22 21 20 19 18 17 16 15 14 13 NC 1Y DGND1 VCCD1 2Y NC NC 3Y VCCD2 DGND2 4Y NC SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 FUNCTIONAL BLOCK DIAGRAMS (one of four receivers shown) To Three Other Receivers 348 Devices To One Other Receiver 352 Devices EN EN EN A RIN+ ROUT1 Y RIN- B Timer Timer SN65LVDT348 Only SN65LVDT352 Only Window Comparator Window Comparator AVAILABLE OPTIONS PART NUMBER (1) INTEGRATED TERMINATION PACKAGE TYPE PACKAGE MARKING SOIC LVDS348 SOIC LVDT348 SN65LVDS348D SN65LVDT348D SN65LVDS348PW SN65LVDT348PW SN65LVDS352PW SN65LVDT352PW (1) TSSOP DL348 TSSOP DE348 TSSOP DL352 TSSOP DE352 Add the R suffix to the device type (e.g., SN65LVDS348DR) for taped and reeled carrier. FUNCTION TABLES 348 DEVICES INPUTS OUTPUTS VID = VRIN+ - VRIN- EN EN ROUT VID -32 mV H L or OPEN H 100 mV < VID < -32 mV H L or OPEN ? VID -100 mV H L or OPEN L Open H L or OPEN H L or OPEN X Z X H Z X 352 DEVICES INPUTS OUTPUTS VID = VIA - VIB EN Y VID -32 mV H H 100 mV < VID < -32 mV H ? VID -100 mV H L X L or OPEN Z Open H H Submit Documentation Feedback 3 SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 EQUIVALENT INPUT AND OUTPUT SCHEMATIC DIAGRAMS VCC VCC 1 pF 6.5 k 60 k Attenuation Network RIN+, A 250 k RIN-, B 7V 7V 7V 110 'LVDT Only Attenuation Network VCC VCC 100 37 EN, EN ROUT, Y 7V 4 Attenuation Network 7V 200 k 3 pF 6.5 k 7V 300 k Submit Documentation Feedback SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) UNIT Supply voltage range (2), VCC,VCCA,VCCD1, and VCCD2 -0.5 V TO 4 V Enables, ROUT, or Y Voltage range -0.5 V to 6 V Differential input magnitude MVIDM (LVDT only) 1V RIN+, RIN-, A or B -5 V to 6 V Human body model (3) A, B, RIN+, RIN- and GND Electrostatic discharge Charged-device model (4) 15 kV All pins 7 kV All pins 500 V Continuous power dissipation See Dissipation Rating Table Storage temperature range (1) (2) (3) (4) -65C to 150C Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage values, except differential I/O bus voltages, are with respect to network ground terminal (GND, AGND). Tested in accordance with JEDEC Standard 22, Test Method A114-A. Tested in accordance with JEDEC Standard 22, Test Method C101. DISSIPATION RATING TABLE (1) PACKAGE TA 25C POWER RATING OPERATING FACTOR (1) ABOVE TA = 25C TA = 85C POWER RATING D16 950 mW 7.6 mW/C 494 mW PW16 774 mW 6.2 mW/C 402 mW PW24 1087 mW 8.7 mW/C 565 mW This is the inverse of the junction-to-ambient thermal resistance when board-mounted and with no air flow. RECOMMENDED OPERATING CONDITIONS MIN NOM MAX UNIT 3 3.3 3.6 V 2 5 V V VCC,VCCA,VCCD1, and VCCD2 Supply voltage VIH High-level input voltage Enables VIL Low-level input voltage Enables 0 0.8 Magnitude of differential input voltage |VID| (LVDT348, 352) 0.1 0.8 |VID| (LVDS348, 352) 0.1 3 -4 5 V -40 85 C Input voltage (any combination of common mode or input signals) TA Operating free-air temperature Submit Documentation Feedback V 5 SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 ELECTRICAL CHARACTERISTICS over recommended operating conditions (unless otherwise noted) PARAMETER VITH1 TEST CONDITIONS Positive-going differential input voltage threshold VITH3 Differential input failsafe voltage threshold VID(HY S) Differential input voltage hysteresis, VITH1 - VITH2 VOH High-level output voltage IOH = -4 mA VOL Low-level output voltage IOL = 4 mA See Figure 1 and Table 1 -32 2.4 V 0.4 Enabled, EN at VCC, 16 20 Disabled, EN at 0 or EN at VCC 1.1 4 LVDS352, LVDT352 Enabled, EN at VCC, 16 20 1.1 4 Input current (RIN+, RIN-, A or B inputs) LVDS348, LVDS352 Power-off input current (RIN+, RIN-, A or B inputs) LVDT348, LVDT352 EN at 0 V, No load No load Disabled, EN at 0 mV mV LVDS348, LVDT348 LVDT348, LVDT352 V mA mA VI = -4 V, Other input open -75 0 V VI 2.4 V, Other input 1.2 V -20 0 VI = 5 V, Other input open 0 40 VI = -4 V, Other input open -150 0 0 V VI 2.4 V, Other input open -40 0 VI = 5 V, Other input open 0 80 VCC = 1.5 V, VI = -4 V or 5 V, Other input open -50 50 VCC = 1.5 V, 0 V VI 2.4 V, Other input at 1.2 V -20 20 -100 100 -40 40 4 A 132 0 10 A 0 10 A -10 10 A VCC = 1.5 V, VI = -4 V or 5 V, Other input open VCC = 1.5 V, VI = 0 V or 2.4 V, Other input open IID Differential input current (IRIN+ - IRIN-, or IIA - IIB) LVDS348, LVDS352 VID = 100 mV, VIC = -3.9 V or 4.9 V -4 RT Differential input resistance LVDT348, LVDT352 VCC = 0 V, VID = 250 mV, VI = 0 V or 2.4 V 90 IIH High-level input current Enables VIH = 2 V IIL Low-level input current Enables VIL = 0.8 V IOZ High-impedance output current CIN Input capacitance, RIN+, RIN- input to GND or A VI = 0.4 sin (4E6ft) + 0.5 V or B input to AGND (1) -100 50 LVDS348, LVDS352 6 mV -50 Supply current II(OFF) UNIT 50 Negative-going differential input voltage threshold II TYP (1) MAX See Figure 1 and Figure 2 VITH2 ICC MIN VO = 0 V All typical values are at 25C and with a 3.3-V supply. Submit Documentation Feedback 0 111 5 A A A A pF SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 SWITCHING CHARACTERISTICS over recommended operating conditions (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP (1) MAX UNIT tPLH Propagation delay time, low-to-high-level output 2.5 4 6 ns tPHL Propagation delay time, high-to-low-level output 2.5 4 6 ns td1 Delay time, failsafe disable time td2 Delay time, failsafe enable time tsk(p) Pulse skew (|tpHL1 - tpLH1|) 0.3 CL = 10 pF, See Figure 3 Output tsk(pp) Part-to-part skew (3) tr Output signal rise time tf Output signal fall time tr Output signal rise time tf Output signal fall time tPHZ Propagation delay time, high-level-to-high-impedance output tPLZ Propagation delay time, low-level-to-high-impedance output tPZH Propagation delay time, high-impedance-to-high-level output tPZL Propagation delay time, high-impedance-to-low-level output (1) (2) (3) ns s 200 skew (2) tsk(o) 12 1.5 ps 150 ps 1 CL = 1 pF, See Figure 3 ns 1 ns 650 ps 400 5 See Figure 4 and Figure 5 ns 1.2 ps 9 ns 5 9 ns 8 12 ns 8 12 ns All typical values are at 25C and with a 3.3-V supply. tsk(o) is the magnitude of the time difference between the tPHL or tPLH of all receivers of a single device with all of their inputs connected together. tsk(pp) is the magnitude of the difference in propagation delay times between any specified terminals of two devices when both devices operate with the same supply voltages, at the same temperature, and have identical packages and test circuits. PARAMETER MEASUREMENT INFORMATION IIA or IRIN+ A or RIN+ Y or ROUT VID (VIA + VIB)/2 or (VRIN+ + VRIN-)/2 VIA or VRIN+ VIC B or RIN- IIB or IRIN- VIB or VRIN- IOY or IROUT VOY or VROUT Figure 1. Voltage and Current Definitions Submit Documentation Feedback 7 SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 PARAMETER MEASUREMENT INFORMATION (continued) 1000 100 + 1000 100 VID + V1 V2 VO - - 10 pF VIC 10 pF 10 pF + - A. Remove for testing LVDT device. B. Input signal of 3 MHz, duty cycle of 500.2%, and transition time of < 1ns. C. Fixture capacitance 20%. D. Resistors are metal film, 1% tolerance, and surface mount VITH1 0V VID -100 mV VO 100 mV VID 0V VITH2 VO Figure 2. VITH1 and VITH2, Input Voltage Threshold Test Circuit and Definitions Table 1. Receiver Minimum and Maximum Failsafe Input Voltage FAILSAFE THRESHOLD TEST VOLTAGES APPLIED VOLTAGES (1) (1) 8 RESULTANT INPUTS Output VIA (mV) VIB (mV) VID (mV) VIC (mV) -4000 -3900 -100 -3950 L -4000 -3968 -32 -3984 H 4900 5000 -100 4950 L 4968 5000 -32 4984 H Voltage applied for greater than 1.5 s. Submit Documentation Feedback SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 A or RIN+ Y or ROUT VID VIA or VRIN+ B or RIN- CL VOY or VROUT VIB or VRIN- A or VRIN+ 1.4 V B or VRIN- 1V >1.5 s 0.4 V VID 0V -0.2 V -0.4 V tPHL tPLH td1 td2 VOH VOY or VROUT VCC/2 VOL tf A. tr All input pulses are supplied by a generator having the following characteristics: tr or tf 1 ns, signaling rate = 250 kHz, duty cycle = 50 2%, CL includes instrumentation and fixture capacitance within 0,06 mm of the D.U.T and is 20%. Figure 3. Timing Test Circuit and Waveforms Submit Documentation Feedback 9 SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 1.2 V RIN- 500 ROUT RIN+ Inputs EN VROUT + _ VTEST 10 pF EN VTEST 2.5 V VRIN+ 1V 2V 1.4 V 0.8 V 2V 1.4 V 0.8 V EN EN tPZL tPZL tPLZ tPLZ 2.5 V 1.4 V VOL +0.5 V VOL VROUT VTEST 0V 1.4 V VRIN+ 2V 1.4 V 0.8 V 2V 1.4 V 0.8 V EN EN tPZH tPZH VOH VOH -0.5 V 1.4 V 0V VROUT A. tPHZ tPHZ All input pulses are supplied by a generator having the following characteristics: tr or tf 1 ns, signaling rate = 500 kHz, duty cycle = 50 2%, CL includes instrumentation and fixture capacitance within 0,06 mm of the D.U.T and is 20%. Figure 4. 348 Enable/Disable Time Test Circuit and Waveforms 10 Submit Documentation Feedback SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 B 1.2 V 500 Y A Inputs EN VO + _ VTEST 10 pF 2.5 V VTEST A 1V 2V 1.4 V 0.8 V EN tPZL tPLZ 2.5 V 1.4 V VOL +0.5 V VOL VO VTEST A 0V 1.4 V EN 2V 1.4 V 0.8 V tPZH tPHZ VOH VOH -0.5 V 1.4 V 0V VO A. All input pulses are supplied by a generator having the following characteristics: tr or tf 1 ns, signaling rate = 500 kHz, duty cycle = 50 2 %, CL includes instrumentation and fixture capacitance within 0,06 mm of the D.U.T and is 20%. Figure 5. 352 Enable/Disable Time Test Circuit and Waveforms Submit Documentation Feedback 11 SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 TYPICAL CHARACTERISTICS LOW-TO-HIGH PROPAGATION DELAY vs FREE-AIR TEMPERATURE HIGH-TO-LOWPROPAGATION DELAY vs FREE-AIR TEMPERATURE 5 5 See NO TAG 4.5 t PHL - High-to-Low Propagation Delay - ns t PLH - Low-to-High Propagation Delay - ns See NO TAG VCC = 3 V VCC = 3.3 V 4 VCC = 3.6 V 3.5 3 -50 0 50 VCC = 3 V 4.5 VCC = 3.3 V 4 VCC = 3.6 V 3.5 3 -50 100 TA - Free-Air Temperature - C 0 50 TA - Free-Air Temperature - C Figure 6. Figure 7. LOW-LEVEL OUTPUT CURRENT vs LOW-LEVEL OUTPUT VOLTAGE HIGH-LEVEL OUTPUT CURRENT vs HIGH-LEVEL OUTPUT VOLTAGE 0 40 TA = 25C, VCC = 3.3 V 12 I OH - High-Level Output Current - mA I OL - Low-Level Output Current - mA TA = 25C, VCC = 3.3 V 30 20 10 0 100 -10 -20 -30 -40 0 VOL - Low-Level Output Voltage - V 1 2 3 VOH - High-Level Output Voltage - V Figure 8. Figure 9. 1 2 3 4 5 0 Submit Documentation Feedback 4 SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 TYPICAL CHARACTERISTICS (continued) DATA TRANSFER RATE vs FREE-AIR TEMPERATURE RMS SUPPLY CURRENT vs SWITCHING FREQUENCY 500 110 Maximum Transfer Rate - Mxfr/s 450 400 I CC - RMS Supply Current - mA 215 -1 prbs NRZ, VIC = 1.2 V, CL = 5.5 pF, 40% Open Eye, 4 Receivers Switching, VCC = 3.3 V, SN65LVDS348PW VID = 0.4 V 350 300 VID = 0.1 V VID = 0.2 V 4 Receivers Switching, 50% Duty Cycle, CL = 5.5 pF, TA = 25C 90 VCC = 3.6 V VCC = 3.3 V 70 VCC = 3 V 50 30 250 200 -60 10 -40 -20 0 20 40 60 80 100 0 50 100 150 200 TA - Free-Air Temperature - C f - Switching Frequency - MHz Figure 10. Figure 11. 223 -1 prbs NRZ, TA = 25C, CL = 5.5 pF, 4 Receivers Switching, VCC = 3.3 V 250 300 223 -1 prbs NRZ, TA = 25C, CL = 5.5 pF, 4 Receivers Switching, VCC = 3.3 V Figure 12. SN65LVDS348 Eye Pattern Running at 200 Mxfr/s Submit Documentation Feedback Figure 13. SN65LVDS352 Eye Pattern Running at 200 Mxfr/s 13 SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 APPLICATION INFORMATION IMPEDANCE MATCHING AND REFLECTIONS A termination mismatch can result in reflections that degrade the signal at the load. A low source impedance causes the signal to alternate polarity at the load (oscillates) as shown in Figure 14. High source impedance results in the signal accumulating monotonically to the final value (stair step) as shown in Figure 15. Both of these modes result in a delay in valid signal and reduce the opening in the eye pattern. A 10% termination mismatch results in a 5% reflection (r = ZL - ZO/ZL + ZO), even a 1:3 mismatch absorbs half of the incoming signal. This shows that termination is important in the more critical cases, however, in a general sense, a rather large termination mismatch is not as critical when the differential output signal is much greater than the receiver sensitivity. TIME DOMAIN RESPONSE 0.25 TIME DOMAIN RESPONSE 0.25 ZS = 0 ZO = 100 ZT = 132 V at Load 0.2 ZS = 0 ZO = 100 ZT = 90 0.2 V at Load VI 0.15 Voltage - V Voltage - V VI 0.1 0.05 0.15 0.1 0.05 0 0 0 5 10 15 20 25 0 5 10 15 20 t - Time - ns t - Time - ns Figure 14. Low-Source Impedance Figure 15. High-Source Impedance 25 For example a 200-mV drive signal into a 100- lossless transmission media with a termination resistor of 90 to 132 results in ~227 mV to 189 mV into the receiver. This would typically be more than enough signal into a receiver with a sensitivity of 50 mV assuming no other disturbance or attenuation on the line. The other factors, which reduce the signal margin, do affect this and therefore it is important to match the impedance as closely as possible to allow more noise immunity at the receiver. 14 Submit Documentation Feedback SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 APPLICATION INFORMATION (continued) ACTIVE FAILSAFE FEATURE A differential line receiver commonly has a failsafe circuit to prevent it from switching on input noise. Current LVDS failsafe solutions require either external components with subsequent reductions in signal quality or integrated solutions with limited application. This family of receivers has a new integrated failsafe that solves the limitations seen in present solutions. A detailed theory of operation is presented in application note The Active Fail-Safe in TI's LVDS Receivers, literature number SLLA082B. The following figure shows one receiver channel with active failsafe. It consists of a main receiver that can respond to a high-speed input differential signal. Also connected to the input pair are two failsafe receivers that form a window comparator. The window comparator has a much slower response than the main receiver and it detects when the input differential falls below 80 mV. A 600-ns failsafe timer filters the window comparator outputs. When failsafe is asserted, the failsafe logic drives the main receiver output to logic high. Output Buffer Main Receiver A B + _ R Reset Failsafe Timer A > B + 80 mV + _ Failsafe B > A + 80 mV + _ Window Comparator Figure 16. Receiver With Active Failsafe ECL/PECL-to-LVTTL CONVERSION WITH TI's LVDS RECEIVER The various versions of emitter-coupled logic (i.e., ECL, PECL and LVPECL) are often the physical layer of choice for system designers. Designers know that established technology is capable of high-speed data transmission. In the past, system requirements often forced the selection of ECL. Now technologies like LVDS provide designers with another alternative. While the total exchange of ECL for LVDS may not be a design option, designers have been able to take advantage of LVDS by implementing a small resistor divider network at the input of the LVDS receiver. TI has taken the next step by introducing a wide common-mode LVDS receiver (no divider network required) which can be connected directly to an ECL driver with only the termination bias voltage required for ECL termination (VCC - 2 V). Figure 17 shows the use of an LV/PECL driver driving 5 meters of CAT-5 cable and being received by TI's wide common-mode receiver and the resulting eye-pattern. The values for R3 are required in order to provide a resistor path to ground for the LV/PECL driver. With no resistor divider, R1 simply needs to match the characteristic load impedance of 50 . The R2 resistor is a small value intended to minimize common-mode reflections. Submit Documentation Feedback 15 SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 APPLICATION INFORMATION (continued) VCC R1 = 50 R2 = 50 ICC 5 Meters of CAT-5 LV/PECL R3 VEE R3 VB VCC ICC LVDS VB R1 R1 R2 R3 = 240 Figure 17. LVPECL or PECL to Remote Wide Common-Mode LVDS Receiver DEVICE POWER AND GROUNDING The SN65LVDS352 device provides separate power and ground pins for the analog input section and the two digital output sections. All of the power pins and all of the ground pins of the device must be tied together at some point in the system. Figure 18 shows one recommended scheme for power and ground to the device. This point will be determined by the power and grounding distribution design, which can greatly affect system performance. Key points to remember when routing power and grounds in your system are: * The grounding system must provide a low impedance path back to the power source. * The signal return must be close to the signal path. * Ground noise occurs due to ground loops and common-mode noise pick-up. * Closely spaced power and ground planes reduce inductance and increase capacitance. A good rule to remember when doing your power distribution and board layout is that the current always flows in the lowest impedance path. At dc the lowest resistance is the lowest impedance, but at high frequencies the lowest impedance is the lowest inductance path. 16 Submit Documentation Feedback SN65LVDS348 , SN65LVDT348 SN65LVDS352, SN65LVDT352 www.ti.com SLLS523E - FEBRUARY 2002 - REVISED MAY 2004 APPLICATION INFORMATION (continued) VCC VCCD1 Bypass Capacitor DGND1 Bypass Capacitor VCCA AGND VCCD2 Bypass Capacitor DGND2 Bypass capacitors used for data sheet electrical testing were low ESR ceramic, surface mount, 0.01 F 10%. For a more accurate determination of these values refer to the application note, The Bypass Capacitor in High-Speed Environments, literature number SCBA007A. Figure 18. Recommended Power and Ground Connection Submit Documentation Feedback 17 PACKAGE OPTION ADDENDUM www.ti.com 26-Aug-2009 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty SN65LVDS348D ACTIVE SOIC D 16 40 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDS348DG4 ACTIVE SOIC D 16 40 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDS348PW ACTIVE TSSOP PW 16 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDS348PWG4 ACTIVE TSSOP PW 16 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDS348PWR ACTIVE TSSOP PW 16 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDS348PWRG4 ACTIVE TSSOP PW 16 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDS352PW ACTIVE TSSOP PW 24 60 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR SN65LVDS352PWG4 ACTIVE TSSOP PW 24 60 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR SN65LVDT348D ACTIVE SOIC D 16 40 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDT348DG4 ACTIVE SOIC D 16 40 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDT348DR ACTIVE SOIC D 16 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDT348DRG4 ACTIVE SOIC D 16 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDT348PW ACTIVE TSSOP PW 16 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDT348PWG4 ACTIVE TSSOP PW 16 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDT348PWR ACTIVE TSSOP PW 16 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDT348PWRG4 ACTIVE TSSOP PW 16 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN65LVDT352PW ACTIVE TSSOP PW 24 60 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR SN65LVDT352PWG4 ACTIVE TSSOP PW 24 60 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR SN65LVDT352PWR ACTIVE TSSOP PW 24 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR SN65LVDT352PWRG4 ACTIVE TSSOP PW 24 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Lead/Ball Finish MSL Peak Temp (3) (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. Addendum-Page 1 PACKAGE OPTION ADDENDUM www.ti.com 26-Aug-2009 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. 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. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. 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Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device SN65LVDS348PWR Package Package Pins Type Drawing TSSOP SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant PW 16 2000 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 SN65LVDT348DR SOIC D 16 2500 330.0 16.4 6.5 10.3 2.1 8.0 16.0 Q1 SN65LVDT348PWR TSSOP PW 16 2000 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 SN65LVDT352PWR TSSOP PW 24 2000 330.0 16.4 6.95 8.3 1.6 8.0 16.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SN65LVDS348PWR TSSOP PW 16 2000 367.0 367.0 35.0 SN65LVDT348DR SOIC D 16 2500 367.0 367.0 38.0 SN65LVDT348PWR TSSOP PW 16 2000 367.0 367.0 35.0 SN65LVDT352PWR TSSOP PW 24 2000 367.0 367.0 38.0 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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