MAX253 Transformer Driver for Isolated RS-485 Interface Absolute Maximum Ratings Supply Voltage (VCC) ...-0.3V to +7V Operating Temperature Ranges Control Input Voltages (SD, FS) ...-0.3V to (VCC + 0.3V) MAX253C_ _ ..0°C to +70°C Output Switch Voltage (D1, D2) ...12V MAX253E_ _ ...-40°C to +85°C Peak Output Switch Current (D1, D2) ..1A MAX253MJA ...-55°C to +125°C Average Output Switch Current (D1, D2) ...200mA Junction Temperatures Continuous Power Dissipation (TA = +70°C) MAX253C_ _/E_ _..+150°C Plastic DIP (derate 9.09mW/°C above +70°C) ...727mW MAX253MJA ...+175°C SO (derate 5.88mW/°C above +70°C) ..471mW Storage Temperature Range ...-65°C to +160°C µMAX (derate 4.10mW/°C above +70°C) ...330mW Lead Temperature (soldering, 10s) ...+300°C CERDIP (derate 8.00mW/°C above +70°C) ..640mW Soldering Temperature (reflow) PDIP, SO, µMAX lead(Pb)-free ...+260°C PDIP, SO, µMAX, CERDIP containing lead(Pb) ..+240°C 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 (VCC = 5V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETERCONDITIONSMINTYPMAXUNITS Switch On-Resistance D1, D2; 100mA 1.5 4.0 Ω FS = VCC or open 250 350 500 Switch Frequency kHz VFS = 0V 150 200 300 Operating Supply Current (Note 1) No load, VSD = 0V, FS low 0.45 5.0 mA Shutdown Supply Current (Note 2) SD = VCC 0.4 µA High 2.4 V Shutdown Input Threshold Low 0.8 µA Shutdown Input Leakage Current 10 pA High 2.4 FS Input Threshold V Low 0.8 VFS = 0V 50 µA FS Input Leakage Current FS = VCC 10 pA Start-Up Voltage 2.5 2.2 V Note 1: Operating supply current is the current used by the MAX253 only, not including load current. Note 2: Shutdown supply current includes output switch-leakage currents. www.maximintegrated.com Maxim Integrated | 2
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