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Table of contents for the manual
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Page 1
General Description The MAX4888A/MAX4889A high-speed passive switches route PCI Express ® (PCIe) data between two possible destinations. The MAX4888A is a quad single-pole/dou- ble-throw (4 x SPDT) switch ideally suited for switching two half lanes of PCIe data between two destinations. The MAX4889A is an octal single-pole/double-throw (8 x SPDT) [...]
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Page 2
MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (V+ = 3.0V to 3.6V, T A = -40°C to +85°C, unless otherwise noted. Typical values are at V+ = 3.3V, T A = +25°C.) (Note 2) Stresses beyond those liste[...]
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Page 3
MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches _______________________________________________________________________________________ 3 Note 2: All units are 100% production tested at T A = +85°C. Limits over the operating temperature range are guaranteed by design and characterization and are not production tested. Note 3: Δ R ON = R O[...]
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MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches 4 _______________________________________________________________________________________ T ypical Operating Characteristics (T A = +25°C, unless otherwise noted.) ON-RESIST ANCE vs. V COM V COM (V) R ON ( Ω ) MAX4888A/89A toc01 -0.1 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 5.0 5.5 6.0 6.[...]
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MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches _______________________________________________________________________________________ 5 T ypical Operating Characteristics (continued) (T A = +25°C, unless otherwise noted.) EYE DIAGRAM (V+ = 3.3V , f = 1.25GHz, 600mV P-P PRBS SIGNAL, R S = R L = 50 Ω ) † 50ps/div *PRBS = PSEUDORANDOM BI[...]
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Page 6
MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches 6 _______________________________________________________________________________________ Pin Description PIN MAX4888A MAX4889A NAME FUNCTION 1, 10, 12, 14, 20, 25, 27 1, 4, 10, 14, 17, 19, 21, 39, 41 GND Ground 2 9 SEL Digital Control Input 3, 9 — N.C. No Connection. Not internally connecte[...]
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MAX4888A/MAX4889A t r < 5ns t f < 5ns 50% V IL LOGIC INPUT V N_ = V NO_ OR V NC_ R L COM_ GND SEL C L INCLUDES FIXTURE AND STRAY CAPACITANCE. V OUT = V N_ ( R L ) R L + R ON V N_ V IH t OFF 0V NO_ OR N C _ 0.9 x V 0UT 0.9 x V OUT t ON V OUT SWITCH OUTPUT LOGIC INPUT V+ C L 3.3V V OUT MAX4888A/MAX4889A Figure 1. Switching Time T est Circuits/T[...]
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MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches 8 _______________________________________________________________________________________ T est Circuits/Timing Diagrams (continued) IN+ V+ 3.3V IN- OUT+ OUT - V IN+ V IN- V OUT+ V OUT - NO_+ OR NC_+ NO_- OR NC_- SEL COM _+ COM _- 0V 1.5V 0V 1.5V 0V 1.5V 0V 1.5V t PLHX t PHLX t INRISE t OUTRIS[...]
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Page 9
MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches _______________________________________________________________________________________ 9 Detailed Description The MAX4888A/MAX4889A high-speed passive switch- es r oute PCIe data between two possible destinations. The MAX4888A/MAX4889A are ideal for routing PCIe sig- nals to change the system[...]
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MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches 10 ______________________________________________________________________________________ Functional Diagrams/T ruth T able MAX4888A GND SEL 0 1 ON OFF OFF ON COM__TO NC__ COM__TO NO__ V+ COM1+ COM1- COM2+ COM2- SEL NC1+ NC1- NO1+ NO1- NC2+ NC2- NO2+ NO2- MAX4889A GND V+ COM1+ COM1- COM4+ COM4[...]
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Page 11
MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches ______________________________________________________________________________________ 11 Applications Information PCIe Switching The MAX4888A/MAX4889A primary applications are aimed at reallocating PCIe lanes (see Figure 5). For example, in graphics applications, several manufacturers have fo[...]
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MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches 12 ______________________________________________________________________________________ T ypical Application Circuit MAX4889A COM1+ COM1- COM2+ COM2- COM3+ COM3- COM4+ COM4- CHANNEL SELECT NC1+ SEL NC1- NC2+ NC2- NC3+ NC3- NC4+ NC4- NO1+ NO1- NO2+ NO2- NO3+ NO3- NO4+ NO4- MAX4889A COM1+ COM1[...]
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Page 13
MAX4888A/MAX4889A Package Infor mation (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages .) 5.0Gbps PCI Expr ess Passive Switches ______________________________________________________________________________________ 13 28L THIN QFN.[...]
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MAX4888A/MAX4889A 5.0Gbps PCI Expr ess Passive Switches Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated[...]