5V/3.3V 155Mbps LASER DIODE DRIVER WITH OUTPUT ENABLE Micrel, Inc. FEATURES ■ ■ ■ ■ ■ ■ SY88822V SY88822V DESCRIPTION Single 3.3V or 5V power supply Up to 155Mbps operation Modulation current to 30mA PECL output enable Differential PECL inputs Available in a tiny 10-pin (3mm) MSOP The SY88822V is a high speed current switch for driving a semiconductor laser diode in optical transmission applications. The modulation current (IOUT) is controlled by the current (IRSET) through the external resistor RSET. The output OUT is HIGH and no current flows through OUT when output enable is HIGH. The device incorporates complementary open collector outputs with a 30mA maximum current driving capability. The external resistor REXT must be placed between /OUT and VCC to dissipate the worst case power. RSER is recommended to compensate for laser diode matching issues. Pin 9 and pin 10 should be connected to achieve better performance. The SY88822V utilizes the high performance bipolar ASSET™ technology. APPLICATIONS ■ 155Mbps SONET FUNCTIONAL BLOCK DIAGRAM VCC REXT /OUT OUT RSER DIN /DIN to Laser Diode Internal IMOD Logic /EN 40X VCC GND GND VREF RSET RSET ASSET is a trademark of Micrel, Inc. M9999-072505 [email protected] or (408) 955-1690 Rev.: B 1 Amendment: /0 Issue Date: July 2005 SY88822V Micrel, Inc. PACKAGE/ORDERING INFORMATION Ordering Information /EN 1 Part Number Package Type Operating Range Package Marking Lead Finish SY88822VKC K10-1 Commercial 822V Sn-Pb SY88822VKCTR(1) K10-1 Commercial 822V Sn-Pb SY88822VKG K10-1 Industrial 822V with Pb-Free bar-line indicator Pb-Free NiPdAu SY88822VKGTR(1) K10-1 Industrial 822V with Pb-Free bar-line indicator Pb-Free NiPdAu 10 OUT DIN 2 9 OUT /DIN 3 8 /OUT VREF 4 7 GND RSET 5 6 VCC 10-Pin MSOP (K10-1) Note: 1. Tape and Reel. PIN DESCRIPTION Pin Number Pin Name Pin Function 1 /EN 2, 3 DIN, /DIN 4 VREF Voltage reference for use with RSET. 5 RSET An external resistor from here to VREF sets the reference current for IOUT. 6 VCC Positive power supply. 100k PECL compatible input w/ 75kΩ pulldown resistor. Modulation current goes to zero when deasserted high. 7 GND 8, 9, 10 /OUT, OUT Differential 100k PECL compatible input w/ 75kΩ pulldown resistors. Device ground. Differential open collector current outputs. TRUTH TABLE(1) D /D /EN OUT (Note 2) /OUT L H L H L H L L L H X X H H L Notes: 1. L = LOW, H = HIGH, X = don't care. 2. H = IOUT = 0mA. M9999-072505 [email protected] or (408) 955-1690 2 SY88822V Micrel, Inc. Absolute Maximum Ratings(1) Operating Ratings(2, 3, 4) Power Supply Voltage (VCC) ............................ 0V to +7.0V Input Voltage (VIN) .............................................. 0V to VCC Output Current (IOUT) ................................................. 30mA Power Dissipation (PD) ........................................... 250mW Lead Temperature (soldering, 20 sec.) ................... +260°C Storage Temperature Range (TS) ............ –55°C to +125°C Supply Voltage (VIN) ................................... +3.0V to +3.6V ........................................................ or +4.5V to +5.5V Ambient Temperature (TA), Note 5 ............ –40°C to +85°C Junction Temperature (TJ), Note 5 ............ –40°C to 100°C Resistor to Dissipate Power (REXT) .................. 10Ω to 50Ω Laser Diode Serial Resistor (RSER) .................... 0Ω to 50Ω Resistor to Adjust Current (RSET), Note 6 ......................................................... 700Ω to 20,000Ω Package Thermal Resistance MSOP (θJA) Still-Air ...................................................... 113°C/W (ψJB) Still-Air ........................................................ 74°C/W DC ELECTRICAL CHARACTERISTICS(7) GND = 0V; VCC = 3.3V ±10% or VCC = 5.0V ±10%; TA = –40°C to +85°C Symbol Parameter VIH Input HIGH Voltage (DIN, /DIN, /EN) VIL Condition Min Max Units VCC–1.165 VCC–0.880 V Input LOW Voltage (DIN, /DIN, /EN) VCC–1.810 VCC–1.475 V VREF Reference Voltage 1.7 2.3 V IIL Input LOW Current (DIN, /DIN, /EN) IIH Input HIGH Current (DIN, /DIN, /EN) ICC Supply Current IOUT_OFF Output LOW Current (/EN = HIGH) IOUT Modulation Current ARSET IOUT/IRSET VOUT Voltage at OUT, /OUT COUT Capacitance on OUT, /OUT VI = VIL(min) Typ 2.0 µA 0.5 IMOD = 25mA 450 30 38 VCC–1.4 2.5 100 µA 25 mA 1000 µA 30 mA 44 — VCC V pF Notes: 1. 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. 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is tested in a socket such that transverse airflow of ≥500lfpm is maintained. 4. The voltage drop across REXT and RSER plus Laser Diode must not be greater than 1.4V. 5. Commercial devices are guaranteed from 0°C to +85°C ambient temperature. 6. RSET minimum 430Ω. 7. Specification for packaged product only. M9999-072505 [email protected] or (408) 955-1690 3 SY88822V Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(8, 9) IMOD =10mA; GND = 0V; VCC = 3.3V ±10% or VCC = 5.0V ±10%; TA = –40°C to +85°C Symbol Parameter Condition tPHL, tPLH D Propagation Delay DIN – OUT tPHL, tPLH EN Propagation Delay /EN – OUT t r, t f Rise/Fall Time (20% to 80%) IOR Output Current Ringing Min Max Units IOUT = 10mA 1000 ps IOUT = 10mA 1000 ps 1000 ps 10 % IOUT = 5 to 30mA Notes: 8. Specification for packaged product only. 9. REXT = RSER = 25Ω ±1%; RSER connected directly to VCC. TYPICAL OPERATING CHARACTERISTICS IMOD vs. RSET 40 IMOD (mA) 30 VCC = 5.0V 20 10 0 0.0 M9999-072505 [email protected] or (408) 955-1690 VCC = 3.3V 1.0 2.0 3.0 RSET (kΩ) 4 4.0 5.0 Typ SY88822V Micrel, Inc. 10 LEAD MSOP (K10-1) Rev. 00 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB USA 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. © 2005 Micrel, Incorporated. M9999-072505 [email protected] or (408) 955-1690 5