MAX3982 19-3354 Rev 2 2/06 SFP Copper-Cable Preemphasis Driver General Description Features The MAX3982 is a single-channel, copper-cable preem- Drives Up to 15m with 24AWG Cable phasis driver that operates from 1Gbps to 4.25Gbps. It Drives Up to 30in of FR4 provides compensation for copper links, such as 4.25Gbps Fibre Channel, allowing spans of up to 15m 0.25W Total Power with +3.3V Supply with 24AWG. The cable driver provides four selectable Selectable 1600mV or 1200mV Differential P-P P-P preemphasis levels. The input compensates for up to Output Swing 10in of FR4 circuit board material at 4.25Gbps. Selectable Output Preemphasis The MAX3982 also features SFP-compliant loss-of-signal detection with selectable sensitivity and TX DISABLE. Fixed Input Equalization Selectable output swing reduces EMI and power con- Loss-of-Signal Detection with Selectable sumption. It is packaged in a 3mm x 3mm, 16-pin thin Sensitivity QFN and operates from 0C to +85C temperature range. Transmit Disable Applications SFP Active Copper-Cable Assemblies Ordering Information Backplanes TEMP PIN- PKG PART RANGE PACKAGE CODE 1.0625Gbps, 2.125Gbps, and 4.25Gbps Fibre Channel MAX3982UTE 0C to +85C 16 Thin QFN T1633-4 1.25Gbps Ethernet MAX3982UTE+ 0C to +85C 16 Thin QFN T1633-4 2.488Gbps STM16 +Denotes lead-free package. InfiniBand Pin Configuration appears at end of data sheet. PCI Express Typical Application Circuit DISK FABRIC SWITCH SFP ACTIVE CABLE ASSEMBLY ENCLOSURE 5V +3.3V +3.3V 4.7k V 15m (24AWG) V CC CC TX DISABLE UP TO 4.25Gbps PE0 LOS PE1 V OR CC LOS GND MAX3982 4.25Gbps LIMITING LOSLEV SWITCH OR COPPER-CABLE AMPLIFIER SWITCH OR OUTLEV 0.01F 0.01F 0.01F SERDES DIFFERENTIAL 100 TWIN-AX SERDES T IN+ OUT+ IN+ OUT+ R X+ X+ 0.01F 0.01F 0.01F T R X- IN- OUT- IN- OUT- X- GND GND +3.3V +3.3V 0.01F 0.01F 0.01F V V CC CC R OUT+ IN+ OUT+ IN+ T X+ X+ 0.01F 0.01F 0.01F R OUT- IN- OUT- IN- T X- X- 4.25Gbps LIMITING MAX3982 5V PE0 AMPLIFIER PE1 V OR LOS CC GND LOSLEV 4.7k OUTLEV TX DISABLE LOS GND GND Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLESFP Copper-Cable Preemphasis Driver ABSOLUTE MAXIMUM RATINGS Supply Voltage, V ..............................................-0.5V to +6.0V LOS Open Collector Supply Voltage CC Continuous CML Output Current with 4.7k Pullup Resistor..............................-0.5V to +5.5V at OUT+, OUT-..............................................-25mA to +25mA Continuous Power Dissipation at +85C Voltage at IN+, IN-, LOSLEV, LOS, (derate 20.8mW/C above +85C).................................1.35W TX DISABLE, PE0, PE1, OUTLEV ..........-0.5V to (V + 0.5V) Operating Junction Temperature Range (T )....-55C to +150C CC J Storage Ambient Temperature Range (T ) .......-55C to +150C S Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = +3.0V to +3.6V, T = 0C to +85C. Typical values are at T = +25C and V = +3.3V, unless otherwise noted.) CC A A CC PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current TX DISABLE=low 75 97 mA Inrush Current Current beyond steady-state current 10 mA Power-On-Reset Delay t 140ms POR OPERATING CONDITIONS Supply Voltage V 3.0 3.3 3.6 V CC Supply-Noise Tolerance 1MHz f < 2GHz 40 mV P-P Operating Ambient Temperature T 025 85 C A Bit Rate NRZ data (Note 1) 1.0 4.25 Gbps CID Consecutive identical digits (bits) (Note 1) 10 Bits CONTROL INPUTS: TX DISABLE, PE0, PE1, OUTLEV, LOSLEV Voltage, Logic High V 2.0 V IH Voltage, Logic Low V 0.8 V IL Current, Logic High I V = V + 0.5V -150 A IH IH CC Current, Logic Low I V = 0.8V 350 A IL IL STATUS OUTPUT: LOS LOS asserted 0 25 A LOS unasserted, V 0.4V with 4.7k OL 1.0 mA pullup resistor, pullup supply = 5.5V LOS Open Collector Current Sink V = 0V, pullup supply = 5.5V, external CC 025A pullup resistor 4.7k LOSLEV = high (Note 1) 100 mV P-P LOS Assert Level LOSLEV = low (Note 1) 50 mV P-P LOSLEV = high (Note 1) 300 mV P-P LOS Deassert Level LOSLEV = low (Note 1) 120 mV P-P LOSLEV = high (Note 1) 20 mV P-P LOS Hysteresis LOSLEV = low (Note 1) 4 mV P-P Time from IN dropping below assert level, LOS Response Time or rising above deassert level to 50% point 10 s of LOS Rise-time or fall-time (10% to 90%), external LOS Transition Time 250 ns pullup resistor = 4.7k 2 MAX3982