MAX6674 Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +128°C) Absolute Maximum Ratings Supply Voltage (VCC to GND) .. -0.3V to +6V Storage Temperature Range .. -65°C to +150°C SO, SCK, CS, T-, T+ to GND ...-0.3V to VCC + 0.3V Junction Temperature ..+150°C SO Current ..50mA SO Package ESD Protection (Human Body Model) .. ±2000V Vapor Phase (60s) ..+215°C Continuous Power Dissipation (TA = +70°C) Infrared (15s) ..+220°C 8-Pin SO (derate 5.88mW/°C above +70°C) ...471mW Lead Temperature (soldering, 10s) .. +300°C Operating Temperature Range ... -20°C to +85°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 = +3.0V to +5.5V, TA = -20°C to +85°C, unless otherwise noted. Typical values specified at +25°C.) (Note 1) PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS TTHERMOCOUPLE = VCC = +3.3V -1 +1 +100°C, TA = +25°C (Note 2) VCC = +5V -1.5 +1.5 Temperature Error °C TTHERMOCOUPLE = VCC = +3.3V -2 +2 0°C to +125°C, TA = +25°C (Note 2) VCC = +5V -3 +3 T e m p e r a t u r e C o n v e r s i o n Constant 5.125 µv/LSB TA = +25°C VCC = +3.3V -1 +1 Cold-Junction Compensation TA = -20°C to +85°C °C VCC = +3.3V and (Note 2) +5V -3 +3 Resolution 0.125 °C Thermocouple Input Impedance 20 kW Supply Voltage VCC 3.0 5.5 V Supply Current ICC 1 2 mA Power-On Reset Threshold VCC rising 1 2 2.5 V Power-On Reset Hysteresis 50 mV Conversion Time (Note 2) 0.15 0.18 s SERIAL INTERFACE Input Low Voltage VIL 0.3 x VCC V Input High Voltage VIH 0.7 x VCC V Input Leakage Current ILEAK VIN = GND or VCC -5 5 µA Input Capacitance CIN 5 pF www.maximintegrated.com Maxim Integrated │ 2
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