SY84402L 4.25Gbps VCSEL Driver General Description Features The SY84402L is a 3.3V VCSEL driver for applications up • 3.3V power supply ® to 4.25Gbps. The driver comes in a 2mm x 2mm MLF • Operates from 100Mps up to 4.25Gbps package which makes it less than half the size of any other • 100k-compatible PECL/ECL I/O driver operating at that rate. The variable output swing on • Guaranteed operation over –40°C to +85°C temperature the SY84402L makes it ideal for use as a VCSEL driver as range well as a backplane driver/receiver. • Fully controllable with Micrel MIC300X controller The operational range of the SY84402L control input is • Available in ultra-small 10-pin MLF® (2mm x 2mm) from VCC-1.42V (for maximum output swing) to VCC (for package minimum output swing). VCTRL can also be driven by a DAC such as those contained in the MIC300X, Micrel’s Applications FOM controller family. The SY84402L provides a VT output for use as a DC bias • Multirate LAN, SAN applications up to 4.25Gbps: for AC-coupling to the device. The input termination Ethernet, GbE, FC network can easily be modified to handle a DC-coupled • SFF, SFP Modules PECL output to save board space by simply tying the VT • Backplane receiver terminal to ground through a 50 Ohm resistor. The VT pin should be used only as a bias for this device as its current sink/source capability is limited. All datasheets and support documentation can be found on Micrel’s web site at: www.micrel.com. ___________________________________________________________________________________________________________ Typical Application MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com October 2009 M9999-102809-A [email protected] or (408) 955-1690 Micrel, Inc. SY84402L Ordering Information Part Number Package Type Operating Range Package Marking Lead Finish MLF-10 Industrial 402L with Pb-Free bar-line indicator Pb-Free NiPdAu SY84402LMGTR(1) Note: 1. Pb-Free package is recommended for new designs. Pin Configuration ® 10-Pin MLF (2mm x 2mm) (MLF-10) Pin Description Pin Number Pin Name Pin Function 1 GND Exposed Pad 2, 3 IN, /IN 4 VT Reference Voltage. Refer to “Interface driver input to different logic drivers” section for proper termination. 5 /EN Active Low TTL. The driver is enabled when this pin is unconnected or /EN asserted low. The driver is disabled when /EN is asserted high. Pulled down internally with 75k Ω resistor. The polarity of the output in disabled state is inverted when POL is exerted high. Refer to the truth table for details. 6 POL TTL input, Pulled down internally with 75kΩ resistor. Asserting this pin high will invert output polarity of the input data. If this pin is asserted low or left open, the polarity is kept unchanged. Refer to the truth table for more details. 8, 7 OUT, /OUT Differential Outputs: Variable swing PECL output pair defaults to undetermined state if inputs left open. See “Typical application” section for recommendations on terminations. 9 VCC 10 VCTRL GND and Exposed pad must be tied to most negative supply. For LVPECL connect to ground. Differential input. Both pins are internally terminated with 50 Ω to VT. Refer to “Interface driver input to different logic drivers” section for more details. Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors. Control Voltage Input: Variable voltage input to control output swings with VCTRL = VCC for minimum swing and VCTRL = VCC-1.42V for maximum swing Truth Table IN /IN /EN POL OUT H L L L H L L H L L L H H L L H L H L H L H H L X X H L L H X X H H H L H: High October 2009 L: Low /OUT X: Don’t care 2 M9999-102909-A [email protected] or (408) 955-1690 Micrel, Inc. SY84402L Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VCC) .................................. –0.5V to +4.0V Input Voltage (VIN) .......................................... –0.5V to VCC LVPECL Output Current (IOUT) Continuous .......................................................... 50mA Surge ................................................................. 100mA Input Current Source or sink current on IN, /IN....................... ±50mA Lead Temperature (soldering, 20 sec.) .................... +260°C Storage Temperature (TS) ....................... –65°C to +150°C Supply Voltage (|VCC–GND|) .......................... 3.0V to 3.6V Ambient Temperature (TA) ......................... –40°C to +85°C (3) Package Thermal Resistance ® MLF (θJA) Still-Air .............................................................. 93°C/W 500lfpm ............................................................. 87°C/W ® MLF (ΨJB) Junction-to-Board ............................................ 32°C/W DC Electrical Characteristics(4) VCC = +3.3V ±10%, TA = –40°C to +85°C, and RL = 50Ω to V CC –2V unless otherwise noted. Symbol Parameter Condition ICC Power Supply Current Max VCC, no load VOH Output HIGH Voltage VOL Output LOW Voltage VCTRL = VCC – 1.42V VOPP Output swing VCTRL = VCC – 1.42V 800 mV VCTRL = VCC 100 mV VIH Input HIGH Voltage VIL Input LOW Voltage VIN Input Voltage Swing RIN(DATA) Input Resistance at IN, /IN, Single Ended VT Reference Voltage VCMR Common Mode Range VCTRL Output swing control voltage Min Single ended Typ Max Units 50 mA V VCC –1.145 VCC –1.020 VCC –0.895 VCC –1.945 VCC -1.820 VCC –1.695 V VCC–1.165 VCC–0.880 VCC–1.945 VCC–1.625 V 100 1700 mVPP 55 Ω 45 50 V VCC -1.32 Note 5 V VCC –1.3 VCC V VCC –1.42 VCC V Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Package Thermal Resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. θJB uses a 4-layer and θJA in still air unless otherwise stated. 4. Specification for packaged product only. 5. The CMR range is referenced to the most positive side of the differential input signal. Normal operation is obtained if the HIGH level falls within the specified range and the peak-to-peak voltage lies between VPP (min.) and 1V. October 2009 3 M9999-102909-A [email protected] or (408) 955-1690 Micrel, Inc. SY84402L AC Electrical Characteristics VCC = +3.3V ±10% and GND = 0V; TA = –40°C to +85°C, RL = 50Ω to VCC –2V unless otherwise noted. Symbol tr , tf Parameter Condition Min Maximum Data Rate NRZ Data 4.25 Output Rise/Fall Times (20% to 80%) OUT, /OUT, Note 6 Typ Max Units Gbps 30 60 80 ps Notes: 6. Output with VCTRL = VCC – 1.42V. Typical Characteristics Typical Modulation Current in 50Ω Load Typical Output Swing vs. VCTRL 900 18 800 16 700 14 600 12 500 10 400 8 300 6 200 4 100 2 0 0 0.2 0.4 0.6 0.8 1 1.2 0 1.4 0 VCC - VCTRL (V) 0.2 0.4 0.6 0.8 1 VCC - VCTRL (V) 1.2 1.4 Functional Characteristics October 2009 4 M9999-102909-A [email protected] or (408) 955-1690 Micrel, Inc. SY84402L Functional Block Diagram Functional Description As shown on the block diagram above, the driver is composed from an input buffer, Enable and polarity block, and output buffer. In order to accommodate VCSELs with different polarity and keep the data non inverted, the input data polarity can be inverted by setting pin 6 (POL) high. The modulation current into the VCSEL is determined by the ratio between the output October 2009 voltage swing and the total load including VCSEL’s equivalent resistance and any damping series resistor. The output signal amplitude is determined by the voltage applied at pin 10 (VCTRL) which should be within the range of VCC-1.42 to VCC. 5 M9999-102909-A [email protected] or (408) 955-1690 Micrel, Inc. SY84402L Input and Output Stages Figure 1a. Simplified Driver Input Stage Figure 1b. Simplified Driver Output Stage Interfacing Driver Input to Different Logic Drivers Figure 2a. AC-Coupled Input to LVPECL Figure 2b. DC-Coupled Input to LVPECL Figure 2c. AC-Coupled Input to CML Figure 2d. DC-Coupled Input to CML October 2009 6 M9999-102909-A [email protected] or (408) 955-1690 Micrel, Inc. SY84402L Package Information ® 10-Pin EPAD MicroLeadFrame (MLF-10) Package Notes: 1. Package meets Level 2 qualification. 2. All parts are dry-packaged before shipment. 3. Exposed pads must be soldered to a plane equivalent to device GND for proper thermal management. MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet 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 a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2009 Micrel, Incorporated. October 2009 7 M9999-102909-A [email protected] or (408) 955-1690