DS25BR150 3.125 Gbps LVDS Buffer General Description Features The DS25BR150 is a single channel 3.125 Gbps LVDS buffer optimized for high-speed signal transmission over printed circuit boards and balanced cables. Fully differential signal paths ensure exceptional signal integrity and noise immunity. The DS25BR150 is a buffer/repeater with very low power consumption. Other LVDS devices with similar IO characteristics and with signal conditioning features include the following products. The DS25BR110 features four levels of equalization for use as an optimized receiver device, the DS25BR120 features four levels of pre-emphasis for use as an optimized driver device, while the DS25BR100 features both pre-emphasis and equalization for use as an optimized repeater device. Wide input common mode range allows the receiver to accept signals with LVDS, CML and LVPECL levels; the output levels are LVDS. A very small package footprint requires a minimal space on the board while the flow-through pinout allows easy board layout. The differential inputs and outputs are internally terminated with a 100 resistor to lower device input and output return losses, reduce component count, and further minimize board space. DC - 3.125 Gbps low jitter, high noise immunity, low power operation On-chip 100 input and output termination minimizes insertion and return losses, reduces component count and minimizes board space 7 kV ESD on LVDS I/O pins protects adjoining components Small 3 mm x 3 mm LLP-8 space saving package Applications Clock or data buffering / repeating OC-48 / STM-16 Clock or data buffering / repeating InfiniBand FireWire Typical Application 30005510 (c) 2007 National Semiconductor Corporation 300055 www.national.com DS25BR150 3.125 Gbps LVDS Buffer November 6, 2007 DS25BR150 Block Diagram 30005507 Pin Diagram 30005508 Pin Descriptions Pin Name Pin Name Pin Type Pin Description NC 1 NA "NO CONNECT" pin. IN+ 2 Input Non-inverting LVDS input pin. IN- 3 Input Inverting LVDS input pin. NC 4 NA "NO CONNECT" pin. NC 5 NA "NO CONNECT" pin. OUT- 6 Output Inverting LVDS output pin. OUT+ 7 Output Non-inverting LVDS Output pin. VCC 8 Power Power supply pin. GND DAP Power Ground pad (DAP - die attach pad) Ordering Codes and Configurations NSID Function DS25BR150TSD Buffer/Repeater www.national.com 2 Package Thermal Resistance If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. JA +60.0C/W JC ESD Susceptibility HBM (Note 1) Supply Voltage (VCC) -0.3V to +4V LVDS Input Voltage (IN+, IN-) -0.3V to +4V LVDS Differential Input Voltage ((IN+) - (IN-)) 0V to 1V LVDS Output Voltage (OUT+, -0.3V to (VCC + 0.3V) OUT-) LVDS Differential Output Voltage ((OUT+) - (OUT-)) 0V to 1V LVDS Output Short Circuit Current 5 ms Duration Junction Temperature +150C Storage Temperature Range -65C to +150C Lead Temperature Range Soldering (4 sec.) +260C Maximum Package Power Dissipation at 25C SDA Package 2.08W Derate SDA Package 16.7 mW/C above +25C +12.3C/W 7 kV 250V 1250V MM (Note 2) CDM (Note 3) Note 1: Human Body Model, applicable std. JESD22-A114C Note 2: Machine Model, applicable std. JESD22-A115-A Note 3: Field Induced Charge Device Model, applicable std. JESD22-C101-C Recommended Operating Conditions Supply Voltage (VCC) Receiver Differential Input Voltage (VID) Operating Free Air Temperature (TA) Min 3.0 0 Typ 3.3 Max 3.6 1 Units V V -40 +25 +85 C DC Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 5, 6, 7) Symbol Parameter Conditions Min Typ Max Units 250 350 450 mV 35 mV 1.375 V 35 mV LVDS OUTPUT DC SPECIFICATIONS (OUT+, OUT-) VOD Differential Output Voltage VOD Change in Magnitude of VOD for Complimentary Output States VOS Offset Voltage VOS Change in Magnitude of VOS for Complimentary Output States RL = 100 IOS Output Short Circuit Current (Note 8) OUT to GND -25 -50 mA OUT to VCC 7.5 50 mA COUT Output Capacitance Any LVDS Output Pin to GND 1.2 pF ROUT Output Termination Resistor Between OUT+ and OUT- 100 RL = 100 -35 1.05 3 1.2 -35 www.national.com DS25BR150 Absolute Maximum Ratings (Note 4) DS25BR150 Symbol Parameter Conditions Min Typ Max Units 1 V 0 +100 mV LVDS INPUT DC SPECIFICATIONS (IN+, IN-) VID Input Differential Voltage VTH Differential Input High Threshold 0 VTL Differential Input Low Threshold VCMR Common Mode Voltage Range VID = 100 mV IIN Input Current VIN = 3.6V or 0V VCC = 3.6V or 0V 1 CIN Input Capacitance Any LVDS Input Pin to GND 1.7 pF RIN Input Termination Resistor Between IN+ and IN- 100 VCM = +0.05V or VCC-0.05V -100 0 0.05 mV VCC 0.05 V 10 A SUPPLY CURRENT ICC Supply Current 27 35 mA Note 4: "Absolute Maximum Ratings" indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the device should not be operated beyond such conditions. Note 5: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed. Note 6: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except VOD and VOD. Note 7: Typical values represent most likely parametric norms for VCC = +3.3V and TA = +25C, and at the Recommended Operation Conditions at the time of product characterization and are not guaranteed. Note 8: Output short circuit current (IOS) is specified as magnitude only, minus sign indicates direction only. www.national.com 4 (Note 11) Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 9, 10) Symbol Parameter Conditions Min Typ Max Units 370 520 ps 355 520 ps LVDS OUTPUT AC SPECIFICATIONS (OUT+, OUT-) tPHLD Differential Propagation Delay High to Low tPLHD Differential Propagation Delay Low to High tSKD1 Pulse Skew |tPLHD - tPHLD| (Note 12) 15 100 ps tSKD2 Part to Part Skew (Note 13) 45 160 ps tLHT Rise Time 80 150 ps tHLT Fall Time 80 150 ps RL = 100 RL = 100 JITTER PERFORMANCE (Figure 5) tDJ1 tDJ2 tRJ1 tRJ2 tTJ1 tTJ2 Deterministic Jitter (Peak-to-Peak Value ) (Note 15) VID = 350 mV VCM = 1.2V K28.5 (NRZ) 2.5 Gbps 11 33 ps 3.125 Gbps 15 41 ps Random Jitter (RMS Value) (Note 14) VID = 350 mV VCM = 1.2V Clock (RZ) 1.25 GHz 0.5 1 ps 1.5625 GHz 0.5 1 ps Total Jitter (Peak to Peak Value) (Note 16) VID = 350 mV VCM = 1.2V PRBS-23 (NRZ) 2.5 Gbps 0.04 0.11 UIP-P 3.125 Gbps 0.07 0.15 UIP-P Note 9: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed. Note 10: Typical values represent most likely parametric norms for VCC = +3.3V and TA = +25C, and at the Recommended Operation Conditions at the time of product characterization and are not guaranteed. Note 11: Specification is guaranteed by characterization and is not tested in production. Note 12: tSKD1, |tPLHD - tPHLD|, is the magnitude difference in differential propagation delay time between the positive going edge and the negative going edge of the same channel. Note 13: tSKD2, 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. Note 14: Measured on a clock edge with a histogram and an acummulation of 1500 histogram hits. Input stimulus jitter is subtracted geometrically. Note 15: Tested with a combination of the 1100000101 (K28.5+ character) and 0011111010 (K28.5- character) patterns. Input stimulus jitter is subtracted algebraically. Note 16: Measured on an eye diagram with a histogram and an acummulation of 3500 histogram hits. Input stimulus jitter is subtracted. 5 www.national.com DS25BR150 AC Electrical Characteristics DS25BR150 DC Test Circuits 30005520 FIGURE 1. Differential Driver DC Test Circuit AC Test Circuits and Timing Diagrams 30005521 FIGURE 2. Differential Driver AC Test Circuit 30005522 FIGURE 3. Propagation Delay Timing Diagram 30005523 FIGURE 4. LVDS Output Transition Times www.national.com 6 DS25BR150 30005529 FIGURE 5. Jitter Measurements Test Circuit 7 www.national.com DS25BR150 Device Operation INPUT INTERFACING The DS25BR150 accepts differential signals and allows simple AC or DC coupling. With a wide common mode range, the DS25BR150 can be DC-coupled with all common differential drivers (i.e. LVPECL, LVDS, CML). The following three figures illustrate typical DC-coupled interface to common differential drivers. Note that the DS25BR150 inputs are internally terminated with a 100 resistor. 30005511 Typical LVDS Driver DC-Coupled Interface to DS25BR150 Input 30005512 Typical CML Driver DC-Coupled Interface to DS25BR150 Input 30005513 Typical LVPECL Driver DC-Coupled Interface to DS25BR150 Input www.national.com 8 The DS25BR150 outputs signals are compliant to the LVDS standard. It can be DC-coupled to most common differential receivers. The following figure illustrates typical DC-coupled interface to common differential receivers and assumes that the receivers have high impedance inputs. While most differential receivers have a common mode input range that can accomodate LVDS compliant signals, it is recommended to check respective receiver's data sheet prior to implementing the suggested interface implementation. 30005514 Typical DS25BR150 Output DC-Coupled Interface to an LVDS, CML or LVPECL Receiver 9 www.national.com DS25BR150 OUTPUT INTERFACING DS25BR150 Typical Performance 30005531 30005530 A 2.5 Gbps NRZ PRBS-7 Output Eye Diagram V:100 mV / DIV, H:75 ps / DIV A 3.125 Gbps NRZ PRBS-7 Output Eye Diagram V:100 mV / DIV, H:50 ps / DIV 30005532 30005533 Total Jitter as a Function of Input Amplitude www.national.com Total Jitter as a Function of Input Amplitude 10 DS25BR150 Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS25BR150TSD NS Package Number SDA08A (See AN-1187 for PCB Design and Assembly Recommendations) 11 www.national.com DS25BR150 3.125 Gbps LVDS Buffer Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH www.national.com/webench Audio www.national.com/audio Analog University www.national.com/AU Clock Conditioners www.national.com/timing App Notes www.national.com/appnotes Data Converters www.national.com/adc Distributors www.national.com/contacts Displays www.national.com/displays Green Compliance www.national.com/quality/green Ethernet www.national.com/ethernet Packaging www.national.com/packaging Interface www.national.com/interface Quality and Reliability www.national.com/quality LVDS www.national.com/lvds Reference Designs www.national.com/refdesigns Power Management www.national.com/power Feedback www.national.com/feedback Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www.national.com/led PowerWise www.national.com/powerwise Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors Wireless (PLL/VCO) www.national.com/wireless THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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