DS90CR217 www.ti.com SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 DS90CR217 +3.3V Rising Edge Data Strobe LVDS 21-Bit Channel Link - 85 MHz Check for Samples: DS90CR217 FEATURES DESCRIPTION • • • • • • • • • • • • • The DS90CR217 transmitter converts 21 bits of CMOS/TTL data into three LVDS (Low Voltage Differential Signaling) data streams. A phase-locked transmit clock is transmitted in parallel with the data streams over a fourth LVDS link. Every cycle of the transmit clock 21 bits of input data are sampled and transmitted. At a transmit clock frequency of 85 MHz, 21 bits of TTL data are transmitted at a rate of 595 Mbps per LVDS data channel. Using a 85 MHz clock, the data throughput is 1.785 Gbit/s (223 Mbytes/sec). 1 2 20 to 85 MHz Shift Clock Support 50% Duty Cycle on Receiver Output Clock Best-in-Class Set & Hold Times on TxINPUTs Low Power Consumption ±1V Common-Mode Range (Around +1.2V) Narrow Bus Reduces Cable Size and Cost Up to 1.785 Gbps Throughput Up to 223 Mbytes/sec Bandwidth 345 mV (typ) Swing LVDS Devices for Low EMI PLL Requires No External Components Rising Edge Data Strobe Compatible with TIA/EIA-644 LVDS Standard Low Profile 48-Lead TSSOP Package The narrow bus and LVDS signalling of the DS90CR217 is an ideal means to solve EMI and cable size problems associated with wide, high-speed TTL interfaces. Block Diagram Figure 1. DS90CR217 See Package Number DGG0048A 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2006–2013, Texas Instruments Incorporated DS90CR217 SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 www.ti.com Connection Diagrams Figure 2. Typical Application These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 2 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 DS90CR217 www.ti.com SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 Absolute Maximum Ratings (1) (2) (1) −0.3V to +4V Supply Voltage (VCC) CMOS/TTL Input Voltage −0.5V to (VCC + 0.3V) CMOS/TTL Output Voltage −0.3V to (VCC + 0.3V) LVDS Receiver Input Voltage −0.3V to (VCC + 0.3V) LVDS Driver Output Voltage −0.3V to (VCC + 0.3V) LVDS Output Short Circuit Duration Continuous Junction Temperature +150°C −65°C to +150°C Storage Temperature Range Lead Temperature (Soldering, 4 sec.) +260°C Maximum Package Power Dissipation @ +25°C DGG0048A (TSSOP) Package: DS90CR217 1.98 W Package Derating DS90CR217 16 mW/°C above +25°C ESD Rating (HBM, 1.5kΩ, 100pF) > 7kV (EIAJ, 0Ω, 200pF) > 700V Latch Up Tolerance @ 25°C (1) > ±300mA If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. “Electrical Characteristics” specify conditions for device operation. (2) Recommended Operating Conditions Min Nom Max Units 3.0 3.3 3.6 V Temperature (TA) −10 +25 +70 °C Receiver Input Range 0 2.4 V Supply Voltage (VCC) Operating Free Air Supply Noise Voltage (VCC) 100 mVPP Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified Symbol Parameter Conditions Min Typ Max Unit s CMOS/TTL DC SPECIFICATIONS VIH High Level Input Voltage 2.0 VCC V VIL Low Level Input Voltage GND 0.8 V VCL Input Clamp Voltage ICL = −18 mA −0.7 9 −1.5 V IIN Input Current VIN = 0.4V, 2.5V or VCC +1.8 +15 μA IOS Output Short Circuit Current −60 −120 mA 290 450 mV 35 mV VIN = GND −10 VOUT = 0V μA 0 LVDS DRIVER DC SPECIFICATIONS VOD Differential Output Voltage ΔVOD Change in VOD between Complimentary Output States RL = 100Ω 250 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 3 DS90CR217 SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 www.ti.com Electrical Characteristics (continued) Over recommended operating supply and temperature ranges unless otherwise specified Symbol Parameter Conditions (1) Min Typ Max Unit s 1.12 5 1.25 1.37 5 V 35 mV VOS Offset Voltage ΔVOS Change in VOS between Complimentary Output States IOS Output Short Circuit Current VOUT = 0V, RL = 100Ω −3.5 −5 mA IOZ Output TRI-STATE Current PWR DWN = 0V, VOUT = 0V or VCC ±1 ±10 μA RL = 100Ω, CL = 5 pF, Worst Case Pattern (Figure 3 and Figure 4) f = 33 MHz 28 42 mA f = 40 MHz 29 47 mA f = 66 MHz 34 52 mA f = 85 MHz 39 57 mA 10 55 μA TRANSMITTER SUPPLY CURRENT ICCTW Transmitter Supply Current Worst Case (with Loads) ICCTZ (1) Transmitter Supply Current Power Down PWR DWN = Low Driver Outputs in TRI-STATE under Powerdown Mode VOS previously referred as VCM. Transmitter Switching Characteristics Over recommended operating supply and temperature ranges unless otherwise specified Symbol Parameter Min Typ Max Units LLHT LVDS Low-to-High Transition Time (Figure 4) 0.75 1.5 ns LHLT LVDS High-to-Low Transition Time (Figure 4) 0.75 1.5 ns TCIT TxCLK IN Transition Time (Figure 5) 6.0 ns TPPos0 Transmitter Output Pulse Position for Bit0 (Figure 12) −0.20 0 0.20 ns TPPos1 Transmitter Output Pulse Position for Bit1 1.48 1.68 1.88 ns TPPos2 Transmitter Output Pulse Position for Bit2 3.16 3.36 3.56 ns TPPos3 Transmitter Output Pulse Position for Bit3 4.84 5.04 5.24 ns TPPos4 Transmitter Output Pulse Position for Bit4 6.52 6.72 6.92 ns TPPos5 Transmitter Output Pulse Position for Bit5 8.20 8.40 8.60 ns TPPos6 Transmitter Output Pulse Position for Bit6 9.88 10.08 10.28 ns TCIP TxCLK IN Period (Figure 7) 11.76 T 50 ns TCIH TxCLK IN High Time (Figure 7) 0.35T 0.5T 0.65T ns TCIL TxCLK IN Low Time (Figure 7) 0.35T 0.5T 0.65T ns TSTC TxIN Setup to TxCLK IN (Figure 7) THTC TxIN Hold to TxCLK IN (Figure 7) TCCD TxCLK IN to TxCLK OUT Delay @ 25°C, VCC = 3.3V (Figure 8) TPLLS 1.0 f = 85 MHz f = 85 MHz 2.5 ns 0 ns 6.3 ns Transmitter Phase Lock Loop Set (Figure 9) 10 ms TPDD Transmitter Powerdown Delay (Figure 11) 100 ns TJIT TxCLK IN Cycle-to-Cycle Jitter 2 ns 4 Submit Documentation Feedback 3.8 Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 DS90CR217 www.ti.com SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 AC Timing Diagrams Figure 3. “Worst Case” Test Pattern Figure 4. DS90CR217 (Transmitter) LVDS Output Load and Transition Times Figure 5. D590CR217 (Transmitter) Input Clock Transition Time Measurements at VDIFF = 0V TCCS measured between earliest and latest LVDS edges TxCLK Differential Low→High Edge Figure 6. DS90CR217 (Transmitter) Channel-to-Channel Skew Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 5 DS90CR217 SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 www.ti.com Figure 7. DS90CR217 (Transmitter) Setup/Hold and High/Low Times Figure 8. DS90CR217 (Transmitter) Clock In to Clock Out Delay Figure 9. DS90CR217 (Transmitter) Phase Lock Loop Set Time Figure 10. 21 Parallel TTL Data Inputs Mapped to LVDS Outputs (DS90CR217) 6 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 DS90CR217 www.ti.com SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 Figure 11. Transmitter Powerdown Delay Figure 12. Transmitter LVDS Output Pulse Position Measurement Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 7 DS90CR217 SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 www.ti.com APPLICATIONS INFORMATION Table 1. DS90CR217 PIN DESCRIPTIONS — CHANNEL LINK TRANSMITTER I/O No. TxIN Pin Name I 21 TTL level input. Description TxOUT+ O 3 Positive LVDS differential data output. TxOUT− O 3 Negative LVDS differential data output. TxCLK IN I 1 TTL level clock input. The rising edge acts as data strobe. Pin name TxCLK IN. TxCLK OUT+ O 1 Positive LVDS differential clock output. TxCLK OUT− O 1 Negative LVDS differential clock output. PWR DWN I 1 TTL level input. Assertion (low input) TRI-STATEs the outputs, ensuring low current at power down. See Applications Information section. VCC I 4 Power supply pins for TTL inputs. GND I 5 Ground pins for TTL inputs. PLL VCC I 1 Power supply pins for PLL. PLL GND I 2 Ground pins for PLL. LVDS VCC I 1 Power supply pin for LVDS outputs. LVDS GND I 3 Ground pins for LVDS outputs. The Channel Link devices are intended to be used in a wide variety of data transmission applications. Depending upon the application the interconnecting media may vary. For example, for lower data rate (clock rate) and shorter cable lengths (< 2m), the media electrical performance is less critical. For higher speed/long distance applications the media's performance becomes more critical. Certain cable constructions provide tighter skew (matched electrical length between the conductors and pairs). Twin-coax for example, has been demonstrated at distances as great as 5 meters and with the maximum data transfer of 1.785 Gbit/s. Additional applications information can be found in the following Interface Application Notes: AN = #### Topic AN-1041 (SNLA218) Introduction to Channel Link AN-1108 (SNLA008) Channel Link PCB and Interconnect Design-In Guidelines AN-1109 (SNLA220) Multi-Drop Channel-Link Operation AN-806 (SNLA026) Transmission Line Theory AN-905 (SNLA035) Transmission Line Calculations and Differential Impedance AN-916 (SNLA219) Cable Information CABLES A cable interface between the transmitter and receiver needs to support the differential LVDS pairs. The ideal cable/connector interface would have a constant 100Ω differential impedance throughout the path. It is also recommended that cable skew remain below 90ps (@ 85 MHz clock rate) to maintain a sufficient data sampling window at the receiver. In addition to the four or five cable pairs that carry data and clock, it is recommended to provide at least one additional conductor (or pair) which connects ground between the transmitter and receiver. This low impedance ground provides a common-mode return path for the two devices. Some of the more commonly used cable types for point-to-point applications include flat ribbon, flex, twisted pair and Twin-Coax. All are available in a variety of configurations and options. Flat ribbon cable, flex and twisted pair generally perform well in short point-to-point applications while Twin-Coax is good for short and long applications. When using ribbon cable, it is recommended to place a ground line between each differential pair to act as a barrier to noise coupling between adjacent pairs. For Twin-Coax cable applications, it is recommended to utilize a shield on each cable pair. All extended point-to-point applications should also employ an overall shield surrounding all cable pairs regardless of the cable type. This overall shield results in improved transmission parameters such as faster attainable speeds, longer distances between transmitter and receiver and reduced problems associated with EMS or EMI. 8 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 DS90CR217 www.ti.com SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 The high-speed transport of LVDS signals has been demonstrated on several types of cables with excellent results. However, the best overall performance has been seen when using Twin-Coax cable. Twin-Coax has very low cable skew and EMI due to its construction and double shielding. All of the design considerations discussed here and listed in the supplemental application notes provide the subsystem communications designer with many useful guidelines. It is recommended that the designer assess the tradeoffs of each application thoroughly to arrive at a reliable and economical cable solution. BOARD LAYOUT To obtain the maximum benefit from the noise and EMI reductions of LVDS, attention should be paid to the layout of differential lines. Lines of a differential pair should always be adjacent to eliminate noise interference from other signals and take full advantage of the noise canceling of the differential signals. The board designer should also try to maintain equal length on signal traces for a given differential pair. As with any high-speed design, the impedance discontinuities should be limited (reduce the numbers of vias and no 90 degree angles on traces). Any discontinuities which do occur on one signal line should be mirrored in the other line of the differential pair. Care should be taken to ensure that the differential trace impedance match the differential impedance of the selected physical media (this impedance should also match the value of the termination resistor that is connected across the differential pair at the receiver's input). Finally, the location of the CHANNEL LINK TxOUT pins should be as close as possible to the board edge so as to eliminate excessive pcb runs. All of these considerations will limit reflections and crosstalk which adversely effect high frequency performance and EMI. UNUSED INPUTS All unused inputs at the TxIN inputs of the transmitter may be tied to ground or left no connect. TERMINATION Use of current mode drivers requires a terminating resistor across the receiver inputs. The CHANNEL LINK chipset will normally require a single 100Ω resistor between the true and complement lines on each differential pair of the receiver input. The actual value of the termination resistor should be selected to match the differential mode characteristic impedance (90Ω to 120Ω typical) of the cable. Figure 13 shows an example. No additional pull-up or pull-down resistors are necessary as with some other differential technologies such as PECL. Surface mount resistors are recommended to avoid the additional inductance that accompanies leaded resistors. These resistors should be placed as close as possible to the receiver input pins to reduce stubs and effectively terminate the differential lines. Figure 13. LVDS Serialized Link Termination DECOUPLING CAPACITORS Bypassing capacitors are needed to reduce the impact of switching noise which could limit performance. For a conservative approach three parallel-connected decoupling capacitors (Multi-Layered Ceramic type in surface mount form factor) between each VCC and the ground plane(s) are recommended. The three capacitor values are 0.1 μF, 0.01 μF and 0.001 μF. An example is shown in Figure 14. The designer should employ wide traces for power and ground and ensure each capacitor has its own via to the ground plane. If board space is limiting the number of bypass capacitors, the PLL VCC should receive the most filtering/bypassing. Next would be the LVDS VCC pins and finally the logic VCC pins. Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 9 DS90CR217 SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 www.ti.com Figure 14. CHANNEL LINK Decoupling Configuration CLOCK JITTER The CHANNEL LINK devices employ a PLL to generate and recover the clock transmitted across the LVDS interface. The width of each bit in the serialized LVDS data stream is one-seventh the clock period. For example, a 85 MHz clock has a period of 11.76 ns which results in a data bit width of 1.68 ns. Differential skew (Δt within one differential pair), interconnect skew (Δt of one differential pair to another) and clock jitter will all reduce the available window for sampling the LVDS serial data streams. Care must be taken to ensure that the clock input to the transmitter be a clean low noise signal. Individual bypassing of each VCC to ground will minimize the noise passed on to the PLL, thus creating a low jitter LVDS clock. These measures provide more margin for channelto-channel skew and interconnect skew as a part of the overall jitter/skew budget. COMMON-MODE vs. DIFFERENTIAL MODE NOISE MARGIN The typical signal swing for LVDS is 300 mV centered at +1.2V. The CHANNEL LINK receiver supports a 100 mV threshold therefore providing approximately 200 mV of differential noise margin. Common-mode protection is of more importance to the system's operation due to the differential data transmission. LVDS supports an input voltage range of Ground to +2.4V. This allows for a ±1.0V shifting of the center point due to ground potential differences and common-mode noise. TRANSMITTER INPUT CLOCK The transmitter input clock must always be present when the device is enabled (PWR DWN = HIGH). If the clock is stopped, the PWR DWN pin must be used to disable the PLL. The PWR DWN pin must be held low until after the input clock signal has been reapplied. This will ensure a proper device reset and PLL lock to occur. POWER SEQUENCING AND POWERDOWN MODE Outputs of the CHANNEL LINK transmitter remain in TRI-STATE until the power supply reaches 2V. Clock and data outputs will begin to toggle 10 ms after VCC has reached 3V and the Powerdown pin is above 1.5V. Either device may be placed into a powerdown mode at any time by asserting the Powerdown pin (active low). Total power dissipation for each device will decrease to 5 μW (typical). The transmitter input clock may be applied prior to powering up and enabling the transmitter. The transmitter input clock may also be applied after power up; however, the use of the PWR DWN pin is required as described in the TRANSMITTER INPUT CLOCK section. Do not power up and enable (PWR DWN = HIGH) the transmitter without a valid clock signal applied to the TxCLK IN pin. The CHANNEL LINK chipset is designed to protect itself from accidental loss of power to either the transmitter or receiver. If power to the transmit board is lost, the receiver clocks (input and output) stop. The data outputs (RxOUT) retain the states they were in when the clocks stopped. When the receiver board loses power, the receiver inputs are shorted to VCC through an internal diode. Current is limited (5 mA per input) by the fixed current mode drivers, thus avoiding the potential for latchup when powering the device. 10 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 DS90CR217 www.ti.com SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 Figure 15. Single-Ended and Differential Waveforms Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 11 DS90CR217 SNLS226A – OCTOBER 2006 – REVISED FEBRUARY 2013 www.ti.com REVISION HISTORY Changes from Original (February 2013) to Revision A • 12 Page Changed layout of National Data Sheet to TI format .......................................................................................................... 11 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: DS90CR217 PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) DS90CR217MTD NRND TSSOP DGG 48 38 TBD Call TI Call TI -10 to 70 DS90CR217MTD >B DS90CR217MTD/NOPB ACTIVE TSSOP DGG 48 38 Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEAR -10 to 70 DS90CR217MTD >B DS90CR217MTDX/NOPB ACTIVE TSSOP DGG 48 1000 Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEAR -10 to 70 DS90CR217MTD >B (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing DS90CR217MTDX/NOPB TSSOP DGG 48 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 1000 330.0 24.4 Pack Materials-Page 1 8.6 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 13.2 1.6 12.0 24.0 Q1 PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) DS90CR217MTDX/NOPB TSSOP DGG 48 1000 367.0 367.0 45.0 Pack Materials-Page 2 MECHANICAL DATA MTSS003D – JANUARY 1995 – REVISED JANUARY 1998 DGG (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 48 PINS SHOWN 0,27 0,17 0,50 48 0,08 M 25 6,20 6,00 8,30 7,90 0,15 NOM Gage Plane 1 0,25 24 0°– 8° A 0,75 0,50 Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,10 48 56 64 A MAX 12,60 14,10 17,10 A MIN 12,40 13,90 16,90 DIM 4040078 / F 12/97 NOTES: A. B. C. D. All linear dimensions are in millimeters. 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