MAX3079EEPD+

MAX3079EEPD+ is a +3.3V, ±15kV ESD-protected, hot-swap, RS-485 transceiver. It features one driver and one receiver. This device includes fail-safe circuitry, guaranteeing a logic-high receiver output when receiver inputs are open or shorted. The receiver outputs a logic-high if all transmitters on a terminated bus are disabled (high impedance). The devices include a hot-swap capability to eliminate false transitions on the bus during power-up or hot insertion. This transceiver draws 800μA of supply current when unloaded, or when fully loaded with the drivers disabled. This device has a 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. Applications include lighting systems, industrial control, telecom, security systems, and instrumentation.

• Protection for robust performance, ±15kV human body model ESD on I/O pins
• True fail-safe receiver while maintaining EIA/TIA-485 compatibility
• Hot-swap input structure on DE and active-low RE
• Flexible feature set for ease of design, phase controls to correct for twisted-pair reversal
• Driver common-mode output voltage is 3V maximum at R=100 ohm or 54 ohm
• Driver short-circuit output current is 250mA max at 0 ≤ VOUT ≤ 12V, VCC=3.3V ±10%, TA =TMIN to TMAX
• Receiver differential threshold voltage is -125mV typ at -7V ≤ VCM ≤ 12V
• Supply current in shutdown mode is 0.05µA typ at active-low RE=VCC, DE=GND, VCC=3.3V and TA=+25°C
• Enhanced slew-rate-limiting facilitates error free data transmission
• Temperature range from -40°C to +85°C, 14 plastic DIP package

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