DS10BR254 1.5 Gbps 1:4 LVDS Repeater General Description Features The DS10BR254 is a 1.5 Gbps 1:4 LVDS repeater optimized for high-speed signal routing and distribution over FR-4 printed circuit board backplanes and balanced cables. Fully differential signal paths ensure exceptional signal integrity and noise immunity. The device has two different LVDS input channels and a select pin determines which input is active. A loss-of-signal (LOS) circuit monitors both input channels and a unique LOS pin is asserted when no signal is detected at that input. Wide input common mode range allows the switch 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. Each differential input and output is internally terminated with a 100Ω resistor to lower device return losses, reduce component count and further minimize board space. ■ DC - 1.5 Gbps low jitter, low skew, low power operation ■ Wide Input Common Mode Voltage Range allows for DC■ ■ ■ ■ ■ coupled interface to LVDS, CML and LVPECL drivers Redundant inputs LOS circuitry detects open inputs fault condition Integrated 100Ω input and output terminations 8 kV ESD on LVDS I/O pins protects adjoining components Small 6 mm x 6 mm LLP-40 space saving package Applications ■ ■ ■ ■ Clock distribution Clock and data buffering and muxing OC-12 / STM-4 SD/HD SDI Routers Typical Application 30007803 © 2008 National Semiconductor Corporation 300078 www.national.com DS10BR254 1.5 Gbps 1:4 LVDS Repeater April 14, 2008 DS10BR254 Ordering Code NSID Function DS10BR254TSQ 1:4 Repeater Block Diagram 30007801 Connection Diagram 30007802 DS10BR254 Pin Diagram www.national.com 2 DS10BR254 Pin Descriptions Pin Name Pin Number I/O, Type Pin Description IN1+, IN1-, IN2+, IN2-, 4, 5, 6, 7, I, LVDS Inverting and non-inverting high speed LVDS input pins. OUT0+, OUT0-, OUT1+, OUT1-, OUT2+, OUT2-, OUT3+, OUT3- 29, 28, 27, 26, 24, 23, 22, 21 O, LVDS Inverting and non-inverting high speed LVDS output pins. SEL_in 14 I, LVCMOS This pin selects which LVDS input is active. LOS1, LOS2 37, 36 O, LVCMOS Loss Of Signal output pins, LOSn report when an open input fault condition is detected at the input, INn. These are open drain outputs. External pull up resistors are required. PWDN0, PWDN1, PWDN2, PWDN3 35, 34 33, 32 I, LVCMOS Channel output power down pin. When the PWDNn is set to L, the channel output OUTn is in the power down mode. PWDN 38 I, LVCMOS Device power down pin. When the PWDN is set to L, the device is in the power down mode. VDD 3, 8, Power 15,25, 30 Power supply pins. GND 16, DAP Power Ground pin and a pad (DAP - die attach pad). NC 1, 2 9, 10, 11, 12, 13, 17, 18, 19, 20, 31, 39, 40 NC NO CONNECT pins. May be left floating. 3 www.national.com DS10BR254 Package Thermal Resistance Absolute Maximum Ratings (Note 4) θJA If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. +26.9°C/W θJC ESD Susceptibility HBM (Note 1) Supply Voltage −0.3V to +4V LVCMOS Input Voltage −0.3V to (VCC + 0.3V) LVCMOS Output Voltage −0.3V to (VCC + 0.3V) LVDS Input Voltage −0.3V to +4V LVDS Differential Input Voltage 0.0V to +1V LVDS Output Voltage −0.3V to (VCC + 0.3V) LVDS Differential Output Voltage 0.0V to +1V LVDS Output Short Circuit Current 5 ms Duration Junction Temperature +150°C Storage Temperature Range −65°C to +150°C Lead Temperature Range Soldering (4 sec.) +260°C Maximum Package Power Dissipation at 25°C SQA Package 4.65W Derate SQA Package 37.2 mW/°C above +25°C +3.8°C/W ≥8 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 Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 5, 6, 7) Symbol Parameter Conditions Min Typ Max Units LVCMOS DC SPECIFICATIONS VIH High Level Input Voltage 2.0 VDD V VIL Low Level Input Voltage GND 0.8 V IIH High Level Input Current VIN = 3.6V VCC = 3.6V 0 ±10 μA IIL Low Level Input Current VIN = GND VCC = 3.6V 0 ±10 μA VCL Input Clamp Voltage ICL = −18 mA, VCC = 0V −0.9 −1.5 V VOL Low Level Output Voltage IOL= 4 mA 0.26 0.4 V 1 V 0 +100 mV LVDS INPUT DC SPECIFICATIONS VID Input Differential Voltage VTH Differential Input High Threshold 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 Ω www.national.com 0 VCM = +0.05V or VCC-0.05V −100 4 0 0.05 mV VCC 0.05 V ±10 μA Parameter Conditions Min Typ Max Units 250 350 450 mV 35 mV 1.375 V 35 mV LVDS OUTPUT DC SPECIFICATIONS VOD Differential Output Voltage ΔVOD Change in Magnitude of VOD for Complimentary Output States VOS Offset Voltage ΔVOS Change in Magnitude of VOS for Complimentary Output States RL = 100Ω IOS Output Short Circuit Current (Note 8) OUT to GND -35 -55 mA OUT to VCC 7 55 mA RL = 100Ω -35 1.05 1.2 -35 COUT Output Capacitance Any LVDS Output Pin to GND 1.2 pF ROUT Output Termination Resistor Between OUT+ and OUT- 100 Ω SUPPLY CURRENT ICC Supply Current PWDN = H 113 135 mA ICCZ Power Down Supply Current PWDN = L 50 60 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 ΔVOD. Note 7: Typical values represent most likely parametric norms for VCC = +3.3V and TA = +25°C, 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. 5 www.national.com DS10BR254 Symbol DS10BR254 AC Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units 440 650 ps 400 650 ps LVDS OUTPUT AC SPECIFICATIONS tPLHD Differential Propagation Delay Low to High (Note 11) tPHLD Differential Propagation Delay High to Low (Note 11) tSKD1 Pulse Skew |tPLHD − tPHLD| (Notes 11, 12) 40 100 ps tSKD2 Channel to Channel Skew (Notes 11, 13) 40 125 ps tSKD3 Part to Part Skew (Notes 11, 14) 50 200 ps tLHT Rise Time (Note 11) 150 300 ps tHLT Fall Time (Note 11) 150 300 ps tON Any PWDN to Output Active Time 8 20 μs tOFF Any PWDN to Output Inactive Time 5 12 ns tSEL Select Time 5 12 ns 135 MHz 0.5 1 ps 311 MHz 0.5 1 ps 503 MHz 0.5 1 ps 750 MHz 0.5 1 ps 270 Mbps 6 22 ps 622 Mbps 6 21 ps 1.0625 Gbps 9 18 ps 1.5 Gbps 9 17 ps 270 Mbps 0.01 0.03 UIP-P 622 Mbps 0.01 0.03 UIP-P 1.0625 Gbps 0.01 0.04 UIP-P 1.5 Gbps 0.01 0.06 UIP-P RL = 100Ω RL = 100Ω JITTER PERFORMANCE (Note 11) tRJ1 tRJ2 tRJ3 Random Jitter (RMS Value) (Note 15) VID = 350 mV VCM = 1.2V Clock (RZ) tRJ4 tDJ1 tDJ2 tDJ3 Deterministic Jitter (Peak to Peak Value) (Note 16) VID = 350 mV VCM = 1.2V K28.5 (NRZ) tDJ4 tTJ1 tTJ2 tTJ3 Total Jitter (Note 17) VID = 350 mV VCM = 1.2V PRBS-23 (NRZ) tTJ4 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 = +25°C, 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|, Pulse Skew, 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, Channel to Channel Skew, is the difference in propagation delay (tPLHD or tPHLD) among all output channels in Broadcast mode (any one input to all outputs). Note 14: tSKD3, Part to Part Skew, is defined as the difference between the minimum and maximum differential propagation delays. This specification applies to devices at the same VCC and within 5°C of each other within the operating temperature range. Note 15: Measured on a clock edge with a histogram and an acummulation of 1500 histogram hits. Input stimulus jitter is subtracted geometrically. Note 16: Tested with a combination of the 1100000101 (K28.5+ character) and 0011111010 (K28.5- character) patterns. Input stimulus jitter is subtracted algebraically. Note 17: Measured on an eye diagram with a histogram and an acummulation of 3500 histogram hits. Input stimulus jitter is subtracted. www.national.com 6 DS10BR254 DC Test Circuits 30007820 FIGURE 1. Differential Driver DC Test Circuit AC Test Circuits and Timing Diagrams 30007821 FIGURE 2. Differential Driver AC Test Circuit 30007822 FIGURE 3. Propagation Delay Timing Diagram 30007823 FIGURE 4. LVDS Output Transition Times 7 www.national.com DS10BR254 Functional Description The DS10BR254 is a 1.5 Gbps 1:4 LVDS repeater optimized for high-speed signal routing and distribution over lossy FR-4 printed circuit board backplanes and balanced cables. TABLE 1. Input Select Truth Table www.national.com CONTROL Pin (SEL_in) State Input Selected 0 IN1 1 IN2 8 The DS10BR254 accepts differential signals and allows simple AC or DC coupling. With a wide common mode range, the DS10BR254 can be DC-coupled with all common differential 30007831 Typical LVDS Driver DC-Coupled Interface to an DS10BR254 Input 30007832 Typical CML Driver DC-Coupled Interface to an DS10BR254 Input 30007833 Typical LVPECL Driver DC-Coupled Interface to an DS10BR254 Input 9 www.national.com DS10BR254 drivers (i.e. LVPECL, LVDS, CML). The following three figures illustrate typical DC-coupled interface to common differential drivers. Note that the DS10BR254 inputs are internally terminated with a 100Ω resistor. Input Interfacing DS10BR254 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. Output Interfacing The DS10BR254 outputs signals compliant to the LVDS standard. Its outputs can be DC-coupled to most common differential receivers. The following figure illustrates typical DCcoupled interface to common differential receivers and 30007834 Typical DS10BR254 Output DC-Coupled Interface to an LVDS, CML or LVPECL Receiver www.national.com 10 DS10BR254 Typical Performance 30007863 30007862 A 1.5 Gbps NRZ PRBS-7 After 2" Differential FR-4 Stripline V:100 mV / DIV, H:100 ps / DIV A 1.06 Gbps NRZ PRBS-7 After 2" Differential FR-4 Stripline V:100 mV / DIV, H:200 ps / DIV 30007861 30007860 A 622 Mbps NRZ PRBS-7 After 2" Differential FR-4 Stripline V:100 mV / DIV, H:200 ps / DIV A 270 Mbps NRZ PRBS-7 After 2" Differential FR-4 Stripline V:100 mV / DIV, H:500 ps / DIV 30007870 Supply Current as a Function of a Number of Outputs Used 11 www.national.com DS10BR254 Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS10BR254TSQ NS Package Number SQA40A (See AN-1187 for PCB Design and Assembly Recommendations) www.national.com 12 DS10BR254 Notes 13 www.national.com DS10BR254 1.5 Gbps 1:4 LVDS Repeater 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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