MAX4950A 19-4583 Rev 0 4/09 Dual PCI Express Equalizer/Redriver General Description Features The MAX4950A dual PCI Express (PCIe) equalizer/ Single +3.3V Supply Operation redriver operates from a single +3.3V supply. This device improves signal integrity at the receiver through PCIe Gen I (2.5GT/s) and Gen II (5.0GT/s) Capable programmable input equalization and redrive circuitry Excellent Differential Return Loss: with output deemphasis to correct for high-frequency 8dB (f = 1.25GHz to 2.5GHz) losses. This device permits optimal placement of key PCIe components and longer runs of stripline, Very Low Latency with 280ps (typ) Propagation microstrip, or cable. Delay The MAX4950A contains two identical channels capa- Individual Lane Detection ble of equalizing PCIe Gen I (2.5GT/s) and Gen II (5.0GT/s) signals. The MAX4950A features electrical Three-Level Programmable Input Equalization idle and receiver detection on each channel and a power-saving mode. Three-Level Programmable Output Deemphasis The MAX4950A is available in a small 36-pin (6.0mm x Standard, -2.5dB Programmable Output Levels 6.0mm) TQFN package with flowthrough traces for opti- mal layout and minimal space requirements. The On-Chip 50 Input/Output Terminations MAX4950A is specified over the 0C to +70C commer- Space-Saving, 6.0mm x 6.0mm TQFN Package cial operating temperature range. Ordering Information Applications PART TEMP RANGE PIN-PACKAGE Servers MAX4950ACTX+T 0C to +70C 36 TQFN-EP* Industrial PCs +Denotes a lead(Pb)-free/RoHS-compliant package. Test Equipment *EP = Exposed pad. Computers T = Tape and reel. External Graphics Applications Pin Configuration Communications Switchers TOP VIEW Storage Area Networks 27 26 25 24 23 22 21 20 19 N.C. 28 18 N.C. V 29 17 V CC CC ODEA0 30 16 INEQB0 ODEA1 31 15 INEQB1 MAX4950A O AMPA 32 14 O AMPB INEQA0 33 13 ODEB0 INEQA1 34 12 ODEB1 V 35 11 V CC CC + *EP N.C. 36 10 N.C. 1 2 3 4 5 6 7 8 9 PCI Express is a registered trademark of PCI-SIG Corp. TQFN *CONNECT EXPOSED PAD (EP) TO GND. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. GND GND INAP OUTAP INAM OUTAM GND GND EN RX DET GND GND OUTBP INBP OUTBM INBM GND GNDDual PCI Express Equalizer/Redriver ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) Junction-to-Case Thermal Resistance ( ) (Note 2) JC V ........................................................................-0.3V to +4.0V 36-Pin TQFN...................................................................1C/W CC All Other Pins (Note 1)................................-0.3V to (V + 0.3V) Junction-to-Ambient Thermal Resistance ( ) (Note 2) CC JA Continuous Current IN P, IN M, OUT P, OUT M............30mA 36-Pin TQFN.................................................................28C/W Peak Current IN P, IN M, OUT P, OUT M Operating Temperature Range...............................0C to +70C (pulsed for 1s, 1% duty cycle)..................................100mA Junction Temperature Range ............................-40C to +150C Continuous Power Dissipation (T = +70C) Storage Temperature Range .............................-65C to +150C A 36-Pin TQFN (derate 35.7mW/C above +70C) .......2857mW Lead Temperature (soldering, 10s) .................................+300C Note 1: All I/O pins are clamped by internal diodes. Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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, C = 75nF coupling capacitor on each output, R = 50 resistor on each output, T = 0C to +70C, unless CC CL L A otherwise noted. Typical values are at V = +3.3V and T = +25C.) (Note 3) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC PERFORMANCE Power-Supply Range V 3.0 3.6 V CC EN = V , V = V , CC O AMPA GND Supply Current I 130 165 mA CC V = V (Note 4) O AMPB GND Differential Input Impedance ZDC 80 100 120 RX-DIFF-DC Differential Output Impedance ZDC 80 100 120 TX-DIFF-DC Common-Mode Resistance to Z V = V = 0 to +200mV, input RX-HIGH- IN P IN M 50 k GND terminations not powered IMP-DC-POS Common-Mode Resistance to Z V = V = -150mV to 0, input RX-HIGH- IN P IN M 1 k GND terminations not powered IMP-DC-NEG Common-Mode Resistance to Z 40 50 60 RX-DC GND, Input Terminations Powered Output Short-Circuit Current I Single-ended 90 mA TX-SHORT V TX-CM-DC- Common-Mode Delta Between V = V 100 mV ACTIVE- O AMP GND Active and Idle States IDLE-DELTA DC Output Offset During Active V TX-CM-DC- V - V 25 mV OUT P OUT M State LINE-DELTA DC Output Offset During V TX-IDLE- V - V 10 mV OUT P OUT M Electrical Idle DIFF-DC AC PERFORMANCE f = 0.05GHz to 1.25GHz 10 Differential Input Return Loss RL dB RX-DIFF (Note 5) f = 1.25GHz to 2.5GHz 8 Common-Mode Input Return Loss RL f = 0.05GHz to 2.5GHz 6 dB RX-CM (Note 5) 2 MAX4950A