MAX3070EMAX3079E +3.3V, 15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers General Description Benefits and Features The MAX3070EMAX3079E 3.3V, 15kV ESD-protected, Protection for Robust Performance RS-485/RS-422 transceivers feature one driver and one 15kV Human Body Model ESD on I/O Pins receiver. These devices include fail-safe circuitry, guaranteeing True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compatibility a logic-high receiver output when receiver inputs are open or shorted. The receiver outputs a logic-high if all transmitters Enhanced Slew-Rate-Limiting Facilitates Error- Free Data Transmission (MAX3070E-MAX3075E/ on a terminated bus are disabled (high impedance). The devices include a hot-swap capability to eliminate false MAX3079E) Hot-Swap Input Structure on DE and RE transitions on the bus during power-up or hot insertion. Flexible Feature Set for Ease of Design The MAX3070E/MAX3071E/MAX3072E feature reduced slew-rate drivers that minimize EMI and reduce reflections Pin-Selectable Full/Half-Duplex Operation (MAX3079E) caused by improperly terminated cables, allowing error- Phase Controls to Correct for Twisted-Pair free data transmission up to 250kbps. The MAX3073E/ Reversal (MAX3079E) MAX3074E/MAX3075E also feature slew-rate-limited Allows up to 256 Transceivers on the Bus drivers but allow transmit speeds up to 500kbps. The Available in Industry-Standard SO and DIP packages MAX3076E/MAX3077E/MAX3078E driver slew rates are not limited, making transmit speeds up to 16Mbps possible. 10A Shutdown Current Mode for Power Savings The MAX3079E slew rate is pin-selectable for 250kbps, (Except MAX3071E/MAX3074E/MAX3077E) 500kbps, and 16Mbps. The MAX3072E/MAX3075E/MAX3078E are intended Ordering Information at end of data sheet. for half-duplex communications, and the MAX3070E/ MAX3071E/MAX3073E/MAX3074E/MAX3076E/ Selector Guide, Pin Configurations, and Typical Operating MAX3077E are intended for full-duplex communications. Circuits appear at end of data sheet. The MAX3079E is selectable for half-duplex or full-duplex operation. It also features independently programmable receiver and transmitter output phase through separate pins. The MAX3070EMAX3079E transceivers draw 800A of supply current when unloaded, or when fully loaded with the drivers disabled. All devices have a 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. Applications Lighting Systems Industrial Control Telecom Security Systems Instrumentation 19-2668 Rev 4 1/16MAX3070EMAX3079E +3.3V, 15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers Absolute Maximum Ratings (All voltages referenced to GND) Continuous Power Dissipation (T = +70C) A Supply Voltage (V ) ............................................................+6V 8-Pin SO (derate 5.88mW/C above +70C) ...............471mW CC Control Input Voltage (RE, DE, SLR, 8-Pin Plastic DIP (derate 9.09mW/C above +70C) ..727mW H/F, TXP, RXP) ....................................................-0.3V to +6V 14-Pin SO (derate 8.33mW/C above +70C) .............667mW Driver Input Voltage (DI) ..........................................-0.3V to +6V 14-Pin Plastic DIP (derate 10.0mW/C above +70C) .. 800mW Driver Output Voltage (Z, Y, A, B) ............................-8V to +13V Operating Temperature Ranges Receiver Input Voltage (A, B) ...................................-8V to +13V MAX307 EE .............................................. -40C to +85C Receiver Input Voltage MAX307 EA ............................................ -40C to +125C Full Duplex (A, B) .................................................-8V to +13V MAX3077EMSA ............................................ -55C to +125C Receiver Output Voltage (RO) ................. -0.3V to (V + 0.3V) Junction Temperature ......................................................+150C CC Driver Output Current .....................................................250mA Storage Temperature Range ............................ -65C to +150C Lead Temperature (soldering, 10s) .................................+300C 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. DC Electrical Characteristics (V = 3.3V 10%, T =T to T , unless otherwise noted. Typical values are at V = 3.3V and T = +25C.) (Note 1) CC A MIN MAX CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DRIVER R = 100 (RS422), Figure 1 2 V L CC Differential Driver Output V R = 54 (RS485), Figure 1 1.5 V V OD L CC No load V CC Change in Magnitude of V R = 100 or 54, Figure 1 (Note 2) 0.2 V OD L Differential Output Voltage Driver Common-Mode Output V R = 100 or 54, Figure 1 V /2 3 V OC L CC Voltage Change in Magnitude of V R = 100 or 54, Figure 1 (Note 2) 0.2 V OC L Common-Mode Voltage Input High Voltage V DE, DI, RE, TXP, RXP, H/F 2 V IH Input Low Voltage V DE, DI, RE, TXP, RXP, H/F 0.8 V IL Input Hysteresis V DE, DI, RE, TXP, RXP, H/F 100 mV HYS Input Current I DE, DI, RE 1 A IN1 Input Impedance First Transition DE 1 10 k Input Current I TXP, RXP, H/F internal pulldown 10 40 A IN2 SRL Input High Voltage V - 0.4 V CC SRL Input Middle Voltage V x 0.4 V x 0.6 V CC CC SRL Input Low Voltage 0.4 V SRL = V 75 CC SRL Input Current A SRL = GND -75 V = +12V 125 Output Leakage (Y and Z) DE = GND, IN I A O Full Duplex V = GND or 3.6V V = -7V -100 CC IN Maxim Integrated 2 www.maximintegrated.com