EVALUATION KIT AVAILABLE Half-Duplex RS-485-/RS-422- MAX13487E/MAX13488E Compatible Transceiver with AutoDirection Control General Description Benefits and Features The MAX13487E/MAX13488E +5V, half-duplex, 15kV AutoDirection Saves Space and BOM Cost ESD-protected RS-485/RS-422-compatible transceivers AutoDirection Enables Driver Automatically on feature one driver and one receiver. The MAX13487E/ Transmission, Eliminating an Opto or Other MAX13488E include a hot-swap capability to eliminate Discrete Means of Isolation false transitions on the bus during power-up or live 8-Pin SO Package insertion. Robust Protection Features for Telecom, Industrial, The MAX13487E/MAX13488E feature Maxims propri- and Isolated Applications etary AutoDirection control. This architecture makes the Hot-Swap Capability to Eliminate False Transitions devices ideal for applications, such as isolated RS-485 on the Bus During Power-Up or Live Insertion ports, where the driver input is used in conjunction with Extended ESD Protection for RS-485 I/O Pins the driver-enable signal to drive the differential bus. (15kV Human Body Model) The MAX13487E features reduced slew-rate drivers Options Optimize Designs for Speed or Errorless that minimize EMI and reduce reflections caused by Data Transmission improperly terminated cables, allowing error-free trans- Enhanced Slew-Rate Limiting Facilitates Error- mission up to 500kbps. The MAX13488E driver slew Free Data Transmission (MAX13487E) rate is not limited, allowing transmit speeds up to High-Speed Version (MAX13488E) Allows for 16Mbps. Transmission Speeds Up to 16Mbps The MAX13487E/MAX13488E feature a 1/4-unit load 1/4-Unit Load, Allowing Up to 128 Transceivers on receiver input impedance, allowing up to 128 trans- the Bus ceivers on the bus. These devices are intended for half- duplex communications. All driver outputs are Functional Diagram protected to 15kV ESD using the Human Body Model. The MAX13487E/MAX13488E are available in an 8-pin SO package. The devices operate over the extended -40C to +85C temperature range. MAX13487E 8 MAX13488E V CC Applications + 1 RO R Isolated RS-485 Interfaces - RE Utility Meters 2 RE Industrial Controls Industrial Motor Drives 3 B 7 SHDN Automated HVAC Systems - V DT COM A 6 + Ordering Information/ RI STATE MACHINE DI Selector Guide DE SLEW-RATE PART PIN-PACKAGE 4 LIMITED D DI MAX13487EESA+ 8 SO Yes 5 GND MAX13488EESA+ 8 SO No +Denotes a lead(Pb)-free/RoHS-compliant package. Note: All devices operate over the -40C to +85C temperature range. Pin Configuration/Typical Application Circuit appear at end of data sheet. 19-0740 Rev 1 2/15Half-Duplex RS-485-/RS-422- MAX13487E/MAX13488E Compatible Transceiver with AutoDirection Control Absolute Maximum Ratings (All voltages referenced to GND.) Operating Temperature Range ...........................-40C to +85C Supply Voltage V ...............................................................+6V Junction Temperature......................................................+150C CC SHDN, RE, DI..............................................................-0.3V to +6 Storage Temperature Range .............................-65C to +150C A, B........................................................................... -8V to +13V Lead Temperature (soldering 10s) ..................................+300C Short-Circuit Duration (RO, A, B) to GND ..................Continuous Continuous Power Dissipation (T = +70C) A 8-Pin SO (derate 5.9mW/C above +70C)..................471mW 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 = +5V 5%, T = T to T , unless otherwise noted. Typical values are at V = +5V and T = +25C.) (Note 1) CC A MIN MAX CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DRIVER R = 100, Figure 1 2.0 V DIFF CC Differential Driver Output V R = 54, Figure 1 1.5 V OD DIFF No load V CC Driver Common-Mode Output V R = 100 or 54, Figure 1 V / 2 3 V OC L CC Voltage Driver Disable Threshold V Figure 2 (Note 2) +0.6 +1 V DT Input-High Voltage V DI, SHDN, RE 2.0 V IH Input-Low Voltage V DI, SHDN, RE 0.8 V IL Input Current I DI, SHDN, RE 1 A IN Driver Short-Circuit Output 0V V +12V +50 +250 OUT Current I mA OSD -7V V 0V -250 -50 (Note 3) OUT (V - 1V) V +12V 20 mA Driver Short-Circuit Foldback CC OUT I OSDF Output Current (Note 3) -7V V 0V -20 OUT RECEIVER V = +12V 250 IN Input Current DI = V , V CC CC I A A, B (A and B) = GND or +5V V = -7V -200 IN Receiver Differential Threshold V -7V V +12V -200 +200 mV TH CM Voltage Receiver Input Hysteresis V V + V = 0V 25 mV TH A B V - CC Output-High Voltage V I = -1.6mA, V - V > V V OH O A B TH 1.5 Output-Low Voltage V I = 1mA, V - V < -V 0.4 V OL O A B TH Tri-State Output Current at I 0V V V 1 A OZR O CC Receiver Receiver Input Resistance R -7V V +12V 48 k IN CM Receiver Output Short-Circuit I 0V V V 7 95 mA OSR RO CC Current www.maximintegrated.com Maxim Integrated 2
