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| Micrel DUAL CML/PECL/LVPECL-to-LVDS TRANSLATOR SuperLiteTM SY55855V SY55855V FINAL SuperLiteTM FEATURES s s s s s s s s s Guaranteed fMAX >750MHz over temperature 1.5Gbps throughput capability 3.0V to 5.7V power supply Guaranteed <700ps propagation delay over temperature Guaranteed <50ps within-device skew over temperature LVDS compatible outputs Fully differential I/O architecture Wide operating temperature range: -40C to +85C Available in a tiny 10-pin MSOP package SuperLiteTM DESCRIPTION The SY55855V is a fully differential, CML/PECL/ LVPECL-to-LVDS translator. It achieves LVDS signaling up to 1.5Gbps, depending on the distance and the characteristics of the media and noise coupling sources. LVDS is intended to drive 50 impedance transmission line media such as PCB traces, backplanes, or cables. SY55855V inputs can be terminated with a single resistor between the true and the complement pins of a given input. The SY55855V is a member of Micrel's new SuperLiteTM family of high-speed logic devices. This family features very small packaging, high signal integrity, and operation at many different supply voltages. PIN CONFIGURATION D0 1 /D0 2 D1 3 /D1 4 GND 5 10 VCC 9 Q0 8 /Q0 7 Q1 6 /Q1 APPLICATIONS s s s s High-speed logic Data communications systems Wireless communications systems Telecom systems 10-Pin MSOP FUNCTIONAL BLOCK DIAGRAM PIN NAMES Pin Function CML/PECL/LVPECL Input Data CML/PECL/LVPECL Input Data LVDS Output Data LVDS Output Data Ground VCC D0 /D0 Q0 /Q0 D0, /D0 D1, /D1 Q0, /Q0 D1 /D1 Q1 /Q1 Q1, /Q1 GND VCC SuperLite is a trademark of Micrel, Inc. Rev.: C Amendment: /0 1 Issue Date: March 2003 Micrel SuperLiteTM SY55855V PIN DESCRIPTIONS D0, /D0 - CML/PECL/LVPECL Input (Differential) This is one of the inputs. It is converted to LVDS onto the Q0 and /Q0 outputs. D1, /D1 - CML/PECL/LVPECL Input (Differential) This is the other input. It is converted to LVDS onto the Q1 and /Q1 outputs. Q0, /Q0 - LVDS Output (Differential) This is one LVDS output. It buffers the CML input that appears at D0, /D0. Q1, /Q1 - LVDS Output (Differential) This is the other LVDS output. It buffers the CML input that appears at D1, /D1. FUNCTIONAL DESCRIPTION Establishing Static Logic Inputs The true pin of an input pair is internally biased to ground through a 75k resistor. The complement pin of an input pair is internally biased halfway between VCC and ground by a voltage divider consisting of two 75k resistors. In this way, unconnected inputs appear as logic zeros. To keep an input at static logic zero at VCC > 3.0V, leave both inputs unconnected. For VCC 3.0V, connect the complement input to VCC and leave the true input unconnected. To make an input static logic one, connect the true input to VCC, leave the complement input unconnected. These are the only two safe ways to cause inputs to be at a static value. In particular, no input pin should be directly connected to ground. All NC (no connect) pins should be unconnected. VCC NC X /X NC NC X /X Figure 1. Hard Wiring a Logic "1" (1) Note 1. X is either D0 or D1 input. /X is either /D0 or /D1 input. VCC > 3.0V NC X /X TRUTH TABLE D0 0 0 1 1 D1 0 1 0 1 Q0 0 0 1 1 /Q0 1 1 0 0 Q1 0 1 0 1 /Q1 1 0 1 0 Note 1. VCC VCC 3.0V Figure 2. Hard Wiring a Logic "0" (1) X is either D0 or D1 input. /X is either /D0 or /D1 input. 2 Micrel SuperLiteTM SY55855V LVDS OUTPUTS LVDS stands for Low Voltage Differential Swing. LVDS specifies a small swing of 350mV typical, on a nominal 1.25V common mode above ground. The common mode voltage has tight limits to permit large variations in ground between an LVDS driver and receiver. Also, change in common mode voltage, as a function of data input, is also kept tight, to keep EMI low. 50 50 vOH, vOL vOD 100 1% vOH, vOL GND Figure 3. LVDS Differential Measurement 49.9, 1% vOCM, vOCM 49.9, 1% GND Figure 4. LVDS Common Mode Measurement 50 50 100 Figure 5. LVDS Output Termination 3 Micrel SuperLiteTM SY55855V ABSOLUTE MAXIMUM RATINGS(1) Symbol VCC VIN IOUT TA Tstore Note 1. Rating Power Supply Voltage Input Voltage LVDS Output Current Operating Temperature Range Storage Temperature Range Value -0.5 to +6.0 -0.5 to VCC +0.5 10% -40 to +85 -65 to +150 Unit V V mA C C Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS(1) VCC = 3.0V to 5.7V; GND = 0V; TA = -40C to +85C(2) TA = -40C Symbol VCC ICC Parameter Power Supply Voltage Power Supply Current 3.6V TA = +25C Min. 3.0 -- -- Typ. -- -- 30 Max. 5.7 80 50 TA = +85C Min. 3.0 -- -- Max. 5.7 80 50 Unit V mA Min. 3.0 -- -- Max. 5.7 80 50 Note 1. Note 2. CML DC ELECTRICAL CHARACTERISTICS(1) VCC = 3.0V to 5.7V; GND = 0V; TA = -40C to +85C(2) Symbol VID VIH VIL Note 1. Note 2. Parameter Differential Input Voltage Input HIGH Voltage Input LOW Voltage Min. 100 1.6 1.5 Typ. -- -- -- Max. -- VCC VCC - 0.1 Unit mV V V Condition Specification for packaged product only. Equilibrium temperature. LVDS DC ELECTRICAL CHARACTERISTICS(1) VCC = 3.0V to 5.7V; GND = 0V; TA = -40C to +85C(2) Symbol VOD VOCM VOCM VOH VOL Note 1. Note 2. Note 3. Note 4. Note 5. Parameter Differential Output Voltage(4) Min. 250 1.125 -50 -- 0.925 Typ. -- -- -- -- -- Max. 450 1.375 +50 1.474 -- Unit mV V mV V V Condition 100 Termination Output Common Mode Voltage(3) Change in Common Mode Voltage(3) Output HIGH Voltage(4), (5) Output LOW Voltage(4), (5) IOH = -4.0mA IOL = 4.0mA Specification for packaged product only. Equilibrium temperature. Measured as per Figure 4. Measured as per Figure 3. Do not short output to GND. 4 Micrel SuperLiteTM SY55855V AC ELECTRICAL CHARACTERISTICS(1) VCC = 3.0V to 5.7V; GND = 0V; TA = -40C to +85C(2) Symbol fMAX tPLH tPHL tSKEW tr tf Note 1. Note 2. Note 3. Parameter Maximum Operating Frequency Propagation Delay D0 to Q0, D1 to Q1 Within-Device Skew(3) Part-to-Part Skew (Diff.) LVDS Output Differential Rise/Fall Times (20% to 80%) Min. 750 300 -- -- 100 Typ. -- -- -- -- -- Max. -- 700 50 250 300 Unit MHz ps ps ps Condition Specification for packaged product only. Equilibrium temperature. Worst case difference between Q0 and Q1 from either D0 or D1, when both outputs have the same transition. PRODUCT ORDERING CODE Ordering Code SY55855VKI Package Type K10-1 Operating Range Industrial Package Marking 855V 5 Micrel SuperLiteTM SY55855V EYE DIAGRAMS(1) 622Mbps 3.3V LVPECL-to-LVDS 1.25Gbps 3.3V LVPECL-to-LVDS 1.5Gbps 3.3V LVPECL-to-LVDS 622Mbps 3.3V CML-to-LVDS 1.25Gbps 3.3V CML-to-LVDS 1.5Gbps 3.3V CML-to-LVDS Note 1. 223-1 pattern. 6 Micrel SuperLiteTM SY55855V 10 LEAD MSOP (K10-1) Rev. 00 MICREL, INC. TEL 1849 FORTUNE DRIVE SAN JOSE, CA 95131 FAX USA + 1 (408) 944-0800 + 1 (408) 944-0970 WEB http://www.micrel.com The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2003 Micrel, Incorporated. 7 |
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