DS25CP152Q Automotive 3.125 Gbps LVDS 2x2 Crosspoint Switch General Description Features The DS25CP152Q is a 3.125 Gbps 2x2 LVDS crosspoint switch optimized for high-speed signal routing and switching over lossy FR-4 printed circuit board backplanes and balanced cables. Fully differential signal paths ensure exceptional signal integrity and noise immunity. The non-blocking architecture allows connections of any input to any output or outputs. 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 100 resistor to lower device return losses, reduce component count and further minimize board space. AECQ-100 Grade 3 DC - 3.125 Gbps low jitter, low skew, low power operation Pin configurable, fully differential, non-blocking architecture On-chip 100 input and output terminations minimize return losses, reduce component count and minimize board space 8 kV ESD on LVDS I/O pins protects adjoining components Small 4 mm x 4 mm LLP-16 space saving package Applications Automotive display applications Clock and data buffering and muxing OC-48 / STM-16 SD/HD/3G HD SDI Routers Typical Application 30063670 (c) 2009 National Semiconductor Corporation 300636 www.national.com DS25CP152Q Automotive 3.125 Gbps LVDS 2x2 Crosspoint Switch March 5, 2009 DS25CP152Q Ordering Code NSID Function DS25CP152QSQ 2x2 LVDS Crosspoint Switch Block Diagram 30063601 Connection Diagram 30063602 DS25CP152Q Pin Diagram Pin Descriptions Pin Name Pin Number I/O, Type Pin Description IN0+, IN0- , IN1+, IN1- 1, 2, 3, 4 I, LVDS Inverting and non-inverting high speed LVDS input pins. OUT0+, OUT0-, OUT1+, OUT1- 12, 11, 10, 9 O, LVDS Inverting and non-inverting high speed LVDS output pins. SEL0, SEL1 7, 8 I, LVCMOS Switch configuration pins. There is a 20 k pulldown resistor on each pin. EN0, EN1 14, 13 I, LVCMOS Output enable pins. There is a 20 k pulldown resistor on each pin. NC 6, 15 I, LVCMOS "NO CONNECT" pins. VDD 16 Power Power supply pin. GND 5, DAP Power Ground pin and Device Attach Pad (DAP) ground. www.national.com 2 JA If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. +41.8C/W JC ESD Susceptibility HBM (Note 1) Supply Voltage -0.3V to +4V LVCMOS Input Voltage -0.3V to (VCC + 0.3V) LVDS Input Voltage -0.3V to +4V LVDS Differential Input Voltage 0V to 1.0V LVDS Output Voltage -0.3V to (VCC + 0.3V) LVDS Differential Output Voltage 0V to 1.0V LVDS Output Short Circuit Current 5 ms Duration Junction Temperature +105C Storage Temperature Range -65C to +150C Lead Temperature Range Soldering (4 sec.) +260C Maximum Package Power Dissipation at 25C SQA Package 1.91W Derate SQA Package 23.9 mW/C above +25C +6.9C/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 DC 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 VCC V VIL Low Level Input Voltage GND 0.8 V IIH High Level Input Current VIN = 3.6V VCC = 3.6V 175 250 A IIL Low Level Input Current VIN = GND VCC = 3.6V 0 10 A VCL Input Clamp Voltage ICL = -18 mA, VCC = 0V -0.9 -1.5 V 1 V +100 mV 40 LVDS INPUT DC SPECIFICATIONS VID Input Differential Voltage 0 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 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 0 -100 3 0 0.05 1 mV VCC 0.05 V 10 A www.national.com DS25CP152Q Package Thermal Resistance Absolute Maximum Ratings (Note 4) DS25CP152Q Symbol 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 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 -35 -55 mA OUT to VCC 7 55 mA RL = 100 -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 SUPPLY CURRENT ICC Supply Current EN0 = EN1 = High 64 77 mA ICCZ Supply Current with Outputs Disabled EN0 = EN1 = Low 23 29 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 Over recommended operating supply and temperature ranges unless otherwise specified (Notes 9, 10, 11) Symbol Parameter Conditions Min Typ Max Units 340 500 ps 344 500 ps LVDS OUTPUT AC SPECIFICATIONS tPLHD Differential Propagation Delay Low to High tPHLD Differential Propagation Delay High to Low tSKD1 Pulse Skew |tPLHD - tPHLD| (Note 12) 4 35 ps tSKD2 Channel to Channel Skew (Note 13) 12 40 ps tSKD3 Part to Part Skew (Note 14) 50 150 ps tLHT Rise Time 65 120 ps tHLT Fall Time 65 120 ps tON Output Enable Time ENn = LH to output active 7 20 s tOFF Output Disable Time ENn = HL to output inactive 5 12 ns tSEL Select Time SELn LH or HL to output 3.5 12 ns Random Jitter (RMS Value) (Note 15) VID = 350 mV VCM = 1.2V Clock (RZ) 2.5 Gbps 0.5 1 ps 3.125 Gbps 0.5 1 ps Deterministic Jitter (Peak to Peak) (Note 16) VID = 350 mV VCM = 1.2V K28.5 (NRZ) 2.5 Gbps 8 25 ps 3.125 Gbps 3 19 ps Total Jitter (Peak to Peak) (Note 17) VID = 350 mV VCM = 1.2V PRBS-23 (NRZ) 2.5 Gbps 0.04 0.08 UIP-P 3.125 Gbps 0.03 0.09 UIP-P RL = 100 RL = 100 JITTER PERFORMANCE (Note 11) tRJ1 tRJ2 tDJ1 tDJ2 tTJ1 tTJ2 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|, 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 5C 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. 5 www.national.com DS25CP152Q AC Electrical Characteristics DS25CP152Q DC Test Circuits 30063620 FIGURE 1. Differential Driver DC Test Circuit AC Test Circuits and Timing Diagrams 30063621 FIGURE 2. Differential Driver AC Test Circuit 30063622 FIGURE 3. Propagation Delay Timing Diagram 30063623 FIGURE 4. LVDS Output Transition Times www.national.com 6 The DS25CP152Q is a 3.125 Gbps 2x2 LVDS digital crosspoint switch optimized for high-speed signal routing and switching over lossy FR-4 printed circuit board backplanes and balanced cables. TABLE 1. Switch Configuration Truth Table S1 S0 OUT1 OUT0 0 0 IN0 IN0 0 1 IN0 IN1 1 0 IN1 IN0 1 1 IN1 IN1 TABLE 2. Output Enable Truth Table EN1 EN0 OUT1 OUT0 0 0 Disabled Disabled 0 1 Disabled Enabled 1 0 Enabled Disabled 1 1 Enabled Enabled 7 www.national.com DS25CP152Q Functional Description DS25CP152Q ferential drivers (i.e. LVPECL, LVDS, CML). The following three figures illustrate typical DC-coupled interface to common differential drivers. Note that the DS25CP152Q inputs are internally terminated with a 100 resistor. Input Interfacing The DS25CP152Q accepts differential signals and allows simple AC or DC coupling. With a wide common mode range, the DS25CP152Q can be DC-coupled with all common dif- 30063631 Typical LVDS Driver DC-Coupled Interface to DS25CP152Q Input 30063632 Typical CML Driver DC-Coupled Interface to DS25CP152Q Input 30063633 Typical LVPECL Driver DC-Coupled Interface to DS25CP152Q Input www.national.com 8 The DS25CP152Q outputs signals that are compliant to the LVDS standard. Its outputs can be DC-coupled to most common differential receivers. The following figure illustrates typical DC-coupled interface to common differential receivers 30063634 Typical DS25CP152Q Output DC-Coupled Interface to an LVDS, CML or LVPECL Receiver 9 www.national.com DS25CP152Q 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. Output Interfacing DS25CP152Q Typical Performance 30063651 30063650 A 3.125 Gbps NRZ PRBS-7 After 2" Differential FR-4 Stripline V:100 mV / DIV, H:50 ps / DIV A 2.5 Gbps NRZ PRBS-7 After 2" Differential FR-4 Stripline V:100 mV / DIV, H:75 ps / DIV 30063654 30063655 Total Jitter as a Function of Input Common Mode Voltage www.national.com Total Jitter as a Function of Data Rate 10 DS25CP152Q Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS25CP152QSQ NS Package Number SQA16A (See AN-1187 for PCB Design and Assembly Recommendations) 11 www.national.com DS25CP152Q Automotive 3.125 Gbps LVDS 2x2 Crosspoint Switch 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(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy PowerWise(R) Solutions www.national.com/powerwise Solutions www.national.com/solutions Serial Digital Interface (SDI) www.national.com/sdi Mil/Aero www.national.com/milaero Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless Analog University(R) www.national.com/AU THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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