DS91M125 125 MHz 1:4 M-LVDS Repeater with LVDS Input General Description Features The DS91M125 is a 1:4 M-LVDS repeater designed for driving and distributing clock or data signals to up to four multipoint networks. M-LVDS (Multipoint LVDS) is a new family of bus interface devices based on LVDS technology specifically designed for multipoint and multidrop cable and backplane applications. It differs from standard LVDS in providing increased drive current to handle double terminations that are required in multipoint applications. Controlled transition times minimize reflections that are common in multipoint configurations due to unterminated stubs. A single DS91M125 channel is a 1:4 repeater that accepts M-LVDS/LVDS/CML/LVPECL signals and converts them to M-LVDS signal levels. Each output has an associated independent driver enable pin. The DS91M125 input conforms to the LVDS standard. The DS91M125 has a flow-through pinout for easy PCB layout. It provides a new alternative for high speed multipoint interface applications. It is packaged in a space saving SOIC-16 package. DC - 125 MHz / 250 Mbps low jitter, low skew, low power operation Independent Driver Enable pins Outputs Conform to TIA/EIA-899 M-LVDS Standard Controlled transition times minimize reflections Inputs Conform to TIA/EIA-644-A LVDS Standard 8 kV ESD on M-LVDS output pins protects adjoining components Flow-through pinout simplifies PCB layout Industrial operating temperature range (-40C to +85C) Available in a space saving SOIC-16 package Applications Multidrop / Multipoint clock and data distribution High-Speed, Low Power, Short-Reach alternative to TIA/EIA-485/422 Clock distribution in AdvancedTCA (ATCA) and MicroTCA (TCA, uTCA) backplanes Typical Application 30054202 (c) 2008 National Semiconductor Corporation 300542 www.national.com DS91M125 125 MHz 1:4 M-LVDS Repeater with LVDS Input October 3, 2008 DS91M125 Ordering Information Order Number Function Package Type DS91M125TMA 1:4 Repeater SOIC-16 Connection Diagram 30054201 Logic Diagram 30054203 Pin Descriptions Number Name I/O, Type Description 1, 2, 3, 8 DE I, LVCMOS Driver enable pins: When DE is low, the driver is disabled. When DE is high, the driver is enabled. There is a 300 k pulldown resistor on each pin. 6 DI+ I, LVDS Non-inverting receiver input pin. 7 DI- I, LVDS Inverting receiver input pin. 5 GND Power 10, 11, 14, 15 A O, M-LVDS Non-inverting driver output pin. 9, 12, 13, 16 B O, M-LVDS Inverting driver output pin. 4 VDD Power www.national.com Ground pin. Power supply pin, +3.3V 0.3V 2 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. CDM (Note 3) Supply Voltage -0.3V to +4V LVCMOS Input Voltages -0.3V to (VDD + 0.3V) M-LVDS Output Voltages -1.9V to +5.5V LVDS Input Voltages -0.3V to (VDD + 0.3V) Maximum Package Power Dissipation at +25C SOIC Package 2.21W Derate SOIC Package 19.2 mW/C above +25C Thermal Resistance (4-Layer, 2 oz. Cu, JEDEC) JA 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, VDD Voltage at M-LVDS Outputs Voltage at LVDS Inputs LVCMOS Input Voltage High VIH LVCMOS Input Voltage Low VIL Operating Free Air Temperature TA 52C/W JC Maximum Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 4 seconds) 8 kV 250V 1250V MM (Note 2) 19C/W 140C -65C to +150C 260C Min Typ Max Units 3.0 3.3 3.6 V -1.4 +3.8 V 0 VDD V 2.0 VDD V 0 0.8 V -40 +25 +85 C Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 5, 6, 7, 10) 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 VIH = 3.6V -15 1 15 A IIL Low-Level Input Current VIL = 0V -15 1 15 A VCL Input Clamp Voltage IIN = -18 mA -1.5 480 V M-LVDS Driver DC Specifications |VAB| Differential output voltage magnitude RL = 50, CL = 5pF VAB Change in differential output voltage magnitude between logic states Figures 1, 3 VOS(SS) Steady-state common-mode output voltage RL = 50, CL = 5pF |VOS(SS)| Change in steady-state common-mode output voltage between logic states Figures 1, 2 VA(OC) Maximum steady-state open-circuit output voltage Figure 4 VB(OC) Maximum steady-state open-circuit output voltage VP(H) Voltage overshoot, low-to-high level output VP(L) Voltage overshoot, high-to-low level output 650 mV -50 0 +50 mV 0.3 1.6 2.1 V 0 +50 mV 0 2.4 V 0 2.4 V 1.2VSS V RL = 50, CL = 5pF, CD = 0.5pF Figures 6, 7 (Note 8) -0.2VS V S IOS Differential short-circuit output current Figure 5 (Note 9) IA Driver output current VA = 3.8V, VB = 1.2V IB IAB Driver output current Driver output differential current (IA - IB) -43 43 mA 32 A VA = 0V or 2.4V, VB = 1.2V -20 +20 A VA = -1.4V, VB = 1.2V -32 VB = 3.8V, VA = 1.2V VB = 0V or 2.4V, VA = 1.2V -20 VB = -1.4V, VA = 1.2V -32 VA = VB, -1.4V V 3.8V -4 3 A 32 A +20 A A +4 A www.national.com DS91M125 ESD Susceptibility HBM (Note 1) Absolute Maximum Ratings (Note 4) DS91M125 Symbol IA(OFF) Parameter Driver output power-off current Conditions Min Typ VA = 3.8V, VB = 1.2V, DE = 0V Max Units 32 A +20 A 0V VDD 1.5V VA = 0V or 2.4V, VB = 1.2V, DE = 0V -20 0V VDD 1.5V VA = -1.4V, VB = 1.2V, DE = 0V -32 A 0V VDD 1.5V IB(OFF) Driver output power-off current VB = 3.8V, VA = 1.2V, DE = 0V 32 A +20 A 0V VDD 1.5V VB = 0V or 2.4V, VA = 1.2V, DE = 0V -20 0V VDD 1.5V VB = -1.4V, VA = 1.2V, DE = 0V -32 A 0V VDD 1.5V IAB(OFF) Driver output power-off differential current (IA(OFF) - VA = VB, -1.4V V 3.8V, IB(OFF)) DE = 0V -4 +4 A 0V VDD 1.5V CA Driver output capacitance CB Driver output capacitance CAB CA/B VDD = OPEN 7.8 pF 7.8 pF Driver output differential capacitance 3 pF Driver output capacitance balance (CA/CB) 1 LVDS Receiver DC Specifications VIT+ Positive-going differential input voltage threshold -5 VIT- Negative-going differential input voltage threshold VCMR Common mode voltage range VID = 100 mV IIN Input current VIN = 3.6V, VDD = 3.6V CIN Input capacitance -100 100 -5 0.05 mV mV VDD0.05 V 1 10 A VIN = 0V, VDD = 3.6V 1 10 A VDD = OPEN 5 pF POWER SUPPLY CURRENT ICCD Driver Supply Current RL = 50, DE = VDD 67 78 mA ICCZ TRI-STATE Supply Current DE = GND 21 26 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 nondegradation 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 7: Typical values represent most likely parametric norms for VDD = +3.3V and TA = +25C, and at the Recommended Operation Conditions at the time of product characterization and are not guaranteed. Note 8: Specification is guaranteed by characterization and is not tested in production. Note 9: Output short circuit current (IOS) is specified as magnitude only, minus sign indicates direction only. Note 10: CL includes fixture capacitance and CD includes probe capacitance. 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. www.national.com 4 Over recommended operating supply and temperature ranges unless otherwise specified. (Notes 11, 12, 18) Symbol Parameter Conditions Min Typ Max Units DRIVER AC SPECIFICATION tPLH Differential Propagation Delay Low to High RL = 50, CL = 5 pF, 3.0 5.5 8.5 ns tPHL Differential Propagation Delay High to Low CD = 0.5 pF 3.0 5.5 8.5 ns tSKD1 (tsk(p)) Pulse Skew |tPLHD - tPHLD| (Notes 14, 19) Figures 6, 7 65 350 ps tSKD2 Channel-to-Channel Skew (Notes 15, 19) 65 400 ps tSKD3 Part-to-Part Skew (Notes 16, 19) 2.2 2.5 ns tSKD4 Part-to-Part Skew (Note 17) 5.5 ns tTLH (tr) Rise Time (Note 19) 1.1 2.0 3.0 ns tTHL (tf) Fall Time (Note 19) 1.1 2.0 3.0 ns tPZH Enable Time (Z to Active High) RL = 50, CL = 5 pF, 6 11 ns tPZL Enable Time (Z to Active Low ) CD = 0.5 pF 6 11 ns tPLZ Disable Time (Active Low to Z) Figures 8, 9 6 11 ns tPHZ Disable Time (Active High to Z) 6 11 ns fMAX Maximum Operating Frequency (Note 19) 125 MHz Note 11: 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. Note 12: Typical values represent most likely parametric norms for VDD = +3.3V and TA = +25C, and at the Recommended Operation Conditions at the time of product characterization and are not guaranteed. Note 13: Specification is guaranteed by characterization and is not tested in production. Note 14: 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 15: tSKD2, Channel-to-Channel Skew, is the difference in propagation delay (tPLHD or tPHLD) among all output channels. Note 16: tSKD3, 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 VDD and within 5C of each other within the operating temperature range. Note 17: tSKD4, Part-to-Part Skew, is the differential channel-to-channel skew of any event between devices. This specification applies to devices over recommended operating temperature and voltage ranges, and across process distribution. tSKD4 is defined as |Max - Min| differential propagation delay. Note 18: CL includes fixture capacitance and CD includes probe capacitance. Note 19: Specification is guaranteed by characterization and is not tested in production. 5 www.national.com DS91M125 Switching Characteristics DS91M125 Test Circuits and Waveforms 30054214 FIGURE 1. Differential Driver Test Circuit 30054224 FIGURE 2. Differential Driver Waveforms 30054222 FIGURE 3. Differential Driver Full Load Test Circuit 30054212 FIGURE 4. Differential Driver DC Open Test Circuit www.national.com 6 DS91M125 30054225 FIGURE 5. Differential Driver Short-Circuit Test Circuit 30054216 FIGURE 6. Driver Propagation Delay and Transition Time Test Circuit 30054218 FIGURE 7. Driver Propagation Delays and Transition Time Waveforms 7 www.national.com DS91M125 30054219 FIGURE 8. Driver TRI-STATE Delay Test Circuit 30054221 FIGURE 9. Driver TRI-STATE Delay Waveforms www.national.com 8 DS91M125 Typical Performance Characteristics 30054250 30054251 Driver Rise Time as a Function of Temperature Driver Fall Time as a Function of Temperature 30054258 30054252 Driver Output Signal Amplitude as a Function of Resistive Load Driver Propagation Delay (tPLHD) as a Function of Temperature 30054253 30054254 Driver Propagation Delay (tPHLD) as a Function of Temperature Driver Power Supply Current as a Function of Frequency 9 www.national.com DS91M125 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead (0.150 Wide) Molded Small Outline Package, JEDEC Order Number DS91M125TMA NS Package Number M16A www.national.com 10 DS91M125 Notes 11 www.national.com DS91M125 125 MHz 1:4 M-LVDS Repeater with LVDS Input 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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