MAX6685/MAX6686 19-2459 Rev 2 4/03 Dual-Output Remote-Junction Temperature Switches General Description Features MAX6685/MAX6686 are dual-output temperature switches Pin-Programmed Lower Temperature Threshold that use an external diode-connected transistor as a sens- from +40C to +80C or +75C to +115C ing element. These devices have two logic outputs (T HIGH (5C Increments) and T ). T asserts a logic signal when the remote LOW HIGH Preset Upper Threshold: +120C or +125C temperature crosses the factory-programmed, +120C, or +125C upper trip threshold. T is asserted when the LOW Open-Drain, Active-Low Output for Upper remote temperature exceeds the lower threshold, which is Temperature Alarm controlled by pins S1 and S2. The lower thresholds are CMOS Push-Pull, Active-High or Open-Drain, available in two ranges in 5C increments. The two ranges are +40C to +80C and +75C to +115C. Hysteresis for Active-Low Output for Lower Temperature Alarm both outputs to be deasserted is typically 5C. 1.5C Accuracy T is an open-drain, active-low output for both the HIGH 3.0V to 5.5V, 200A Supply MAX6685 and the MAX6686. T is a CMOS push-pull, LOW active-high output for the MAX6685 and is an open-drain, 8-Pin MAX Package active-low output for the MAX6686. They are available in a space-saving 8-pin MAX package. Applications CPU Temperature Multichip Modules Protection FPGA Temperature Pin Configurations appear at end of data sheet. Fan Control Protection Ordering Information T T TRIP T TRIP LOW LOW HIGH PART PIN-PACKAGE OUTPUT RANGE (0C) THRESHOLD (0C) MAX6685AU40L Push-pull, active high +40C to +80C +120C 8 MAX MAX6685AU40H Push-pull, active high +40C to +80C +125C 8 MAX MAX6685AU75L Push-pull, active high +75C to +115C +120C 8 MAX MAX6685AU75H Push-pull, active high +75C to +115C +125C 8 MAX MAX6686AU40L Open drain, active low +40C to +80C +120C 8 MAX MAX6686AU40H Open drain, active low +40C to +80C +125C 8 MAX MAX6686AU75L Open drain, active low +75C to +115C +120C 8 MAX MAX6686AU75H Open drain, active low +75C to +115C +125C 8 MAX Typical Operating Circuits 3.3V TO SYSTEM 3.3V SHUTDOWN V V DD DD TO SYSTEM 12V DXP T DXP T HIGH HIGH SHUTDOWN CPU CPU C C S MAX6685 S MAX6686 DXN DXN S1 S1 TO CLOCK T N T LOW LOW S2 S2 THROTTLE GND GND CONTROL Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Dual-Output Remote-Junction Temperature Switches ABSOLUTE MAXIMUM RATINGS Voltages Referenced to GND Continuous Power Dissipation (T = +70C) A V T , T .....................................................-0.3V to +6V 8-Pin MAX (derate 4.1mW/C above +70C) .............330mW DD, LOW HIGH DXN .......................................................................-0.3V to +0.8V Operating Temperature Range .........................-40C to +125C All Other Pins..............................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C DD Input Current.........................................................................5mA Storage Temperature Range .............................-65C to +165C Output Current ....................................................................20mA 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. ELECTRICAL CHARACTERISTICS (V = 3.0V to 5.5V, T = -40C to +125C, unless otherwise noted. Typical values are at V = 3.3V and T = +25C.) (Note 1) DD A DD A PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS Power-Supply Range V 3.0 5.5 V DD Average Supply Current I 200 500 A DD Supply Current During 400 800 A Conversion Power-On Reset Threshold POR V falling edge 1.0 1.5 2.0 V DD POR Threshold Hysteresis 50 mV V = 3.3V, T = +25C, T = 0C to +125C DD A RJ -1.5 +1.5 Temperature Threshold (Note 2) T C TH Accuracy T = 0C to +100C, T = 0C to +125C 2.0 A RJ Temperature Threshold T 5.0 C HYST Hysteresis Supply Sensitivity of Temperature T = +25C, T = 0C to +125C, A RJ 0.6 C/V Threshold V = 3.0V to 5.5V DD V - DD Output Voltage High V I = 1mA, MAX6685 T only V OH SOURCE LOW 0.2 Output Voltage Low V I = 1mA 0.2 V OL SINK Logic-Low Input Voltage V S1, S2 0.4 V IL Logic-High Input Voltage V S1, S2 1.8 V IH Input Current S1, S2 10 A Open-Drain Output Leakage V = 5.5V, T and T 1A OUT LOW HIGH Current Conversion Time 0.09 0.11 0.13 s Sample Period 0.35 0.45 0.55 s High level 80 100 120 Current Sourcing for External A Diode Low level 8 10 12 Note 1: All parameters are tested at +25C. Temperature specifications over a range of -40C to +125C are guaranteed by design. Note 2: T is the temperature of the remote-sensing diode junction. RJ 2 MAX6685/MAX6686