DS25CP152 3.125 Gbps LVDS 2x2 Crosspoint Switch General Description Features The DS25CP152 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 100Ω resistor to lower device return losses, reduce component count and further minimize board space. ■ DC - 3.125 Gbps low jitter, low skew, low power operation ■ Pin configurable, fully differential, non-blocking architecture ■ On-chip 100Ω 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 ■ ■ ■ ■ High-speed channel select applications Clock and data buffering and muxing OC-48 / STM-16 SD/HD/3G HD SDI Routers Typical Application 30021803 © 2008 National Semiconductor Corporation 300218 www.national.com DS25CP152 3.125 Gbps LVDS 2x2 Crosspoint Switch January 17, 2008 DS25CP152 Ordering Code NSID Function DS25CP152TSQ 2x2 LVDS Crosspoint Switch Block Diagram 30021801 Connection Diagram 30021802 DS25CP152 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 kΩ pulldown resistor on each pin. EN0, EN1 14, 13 I, LVCMOS Output enable pins. There is a 20 kΩ 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 θJA If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. +41.8°C/W θJC 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 +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 2.99W Derate SQA Package 23.9 mW/°C above +25°C +6.9°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 DC Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 5, 6, 7) Symbol Parameter Conditions Min Typ Max Units VCC V LVCMOS DC SPECIFICATIONS VIH High Level Input Voltage 2.0 VIL Low Level Input Voltage IIH High Level Input Current VIN = 3.6V VCC = 3.6V IIL Low Level Input Current VIN = GND VCC = 3.6V VCL Input Clamp Voltage ICL = −18 mA, VCC = 0V GND 40 0.8 V 175 250 μA 0 ±10 μA −0.9 −1.5 V 1 V +100 mV 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 Ω VCM = +0.05V or VCC-0.05V 0 −100 3 0 0.05 ±1 mV VCC 0.05 V ±10 μA www.national.com DS25CP152 Package Thermal Resistance Absolute Maximum Ratings (Note 4) DS25CP152 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 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 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 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. www.national.com 4 Over recommended operating supply and temperature ranges unless otherwise specified (Notes 9, 10) Symbol Parameter Conditions Min Typ Max Units 340 500 ps 344 500 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) 4 35 ps tSKD2 Channel to Channel Skew (Notes 11, 13) 12 40 ps tSKD3 Part to Part Skew (Notes 11, 14) 50 150 ps tLHT Rise Time (Note 11) 65 120 ps tHLT Fall Time (Note 11) 65 120 ps tON Output Enable Time ENn = LH to output active 7 20 μs 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 = 100Ω RL = 100Ω 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 = +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. 5 www.national.com DS25CP152 AC Electrical Characteristics DS25CP152 DC Test Circuits 30021820 FIGURE 1. Differential Driver DC Test Circuit AC Test Circuits and Timing Diagrams 30021821 FIGURE 2. Differential Driver AC Test Circuit 30021822 FIGURE 3. Propagation Delay Timing Diagram 30021823 FIGURE 4. LVDS Output Transition Times www.national.com 6 The DS25CP152 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 DS25CP152 Functional Description DS25CP152 drivers (i.e. LVPECL, LVDS, CML). The following three figures illustrate typical DC-coupled interface to common differential drivers. Note that the DS25CP152 inputs are internally terminated with a 100Ω resistor. Input Interfacing The DS25CP152 accepts differential signals and allows simple AC or DC coupling. With a wide common mode range, the DS25CP152 can be DC-coupled with all common differential 30021831 Typical LVDS Driver DC-Coupled Interface to DS25CP152 Input 30021832 Typical CML Driver DC-Coupled Interface to DS25CP152 Input 30021833 Typical LVPECL Driver DC-Coupled Interface to DS25CP152 Input www.national.com 8 The DS25CP152 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 30021834 Typical DS25CP152 Output DC-Coupled Interface to an LVDS, CML or LVPECL Receiver 9 www.national.com DS25CP152 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 DS25CP152 Typical Performance 30021851 30021850 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 30021854 30021855 Total Jitter as a Function of Input Common Mode Voltage www.national.com Total Jitter as a Function of Data Rate 10 DS25CP152 Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS25CP152TSQ NS Package Number SQA16A (See AN-1187 for PCB Design and Assembly Recommendations) 11 www.national.com DS25CP152 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 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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