MAX6576/MAX6577 SOT Temperature Sensors with Period/Frequency Output General Description Features The MAX6576/MAX6577 are low-cost, low-current tem- Simple Single-Wire Output perature sensors with a single-wire output. The MAX6576 Two Output Types Available converts the ambient temperature into a square wave with Temperature to Period (s) (MAX6576) a period proportional to absolute temperature (K). The Temperature to Frequency (Hz) (MAX6577) MAX6577 converts the ambient temperature into a square 0.8C Accuracy at +25C (3C max) wave with a frequency proportional to absolute tempera- ture. The MAX6576 offers accuracy of 3C at +25C, No External Components 4.5C at +85C, and 5C at +125C. The MAX6577 Operates from +2.7V to +5.5V Supply Voltage offers accuracy of 3C at +25C, 3.5C at +85C, and Low 140A Typical Supply Current 4.5C at +125C. Standard Operating Temperature Range: Both devices feature a single-wire output that minimizes -40C to +125C the number of pins necessary to interface with a micropro- Small 6-Pin SOT23 Package cessor. The period/frequency range of the output square wave can be selected by hard-wiring the two time-select pins (TS0, TS1) to either V or GND. The MAX6576/ DD MAX6577 are available in space-saving 6-pin SOT23 packages. Ordering Information Applications PIN- SOT TOP Critical P and C Temperature Monitoring PART TEMP. RANGE PACKAGE MARK Portable Battery-Powered Equipment MAX6576ZUT -40C to +125C 6 SOT23 AABI Cell Phones Battery Packs MAX6577ZUT -40C to +125C 6 SOT23 AABJ Hard Drives/Tape Drives Networking and Telecom Equipment Medical Equipment Pin Configuration Typical Operating Circuit TOP VIEW +2.7V TO +5.5V 0.1F 0.1F V V DD CC V 1 6 OUT DD MAX6576 MAX6577 P MAX6576 GND 2 5 TS1 MAX6577 TS1 TS0 GND GND OUT I/O N.C. 3 4 TS0 SOT23-6 19-1484 Rev 1 10/14MAX6576/MAX6577 SOT Temperature Sensors with Period/Frequency Output Absolute Maximum Ratings Terminal Voltage (with respect to GND) Operating Temperature Range...........................-40C to +125C V .......................................................................-0.3V to +6V Storage Temperature Range..............................-65C to +150C DD TS1, TS0, OUT.......................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10sec)...............................+300C DD Input/Output Current, All Pins............................................20mA Continuous Power Dissipation (T = +70C) A 6-pin SOT23 (derate 7.10mW/C above +70C)..........571mW 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 = +2.7V to +5.5V, T = -40C to +125C, unless otherwise noted. Typical values are specified at T = +25C and V = +5V, DD A A DD unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V Range V 2.7 5.5 V DD DD T = -40C to +85C 140 250 A Supply Current I V = 5.5V A DD DD T = -40C to +125C 400 A T = -20C -7.5 1.1 +7.5 A T = 0C -5.5 0.9 +5.5 A MAX6576 T = +25C -3.0 0.8 +3.0 C A T = +85C -4.5 0.5 +4.5 A T = +125C -5.0 0.5 +5.0 Temperature Sensor A Error (Note 1) T = -20C -7.5 1.1 +7.5 A T = 0C -6.5 0.9 +6.5 A MAX6577 T = +25C -3.0 0.8 +3.0 C A T = +85C -3.5 0.5 +3.5 A T = +125C -4.5 0.5 +4.5 A V = GND, V = GND 10T TS1 TS0 MAX6576, V = GND, V = V 40T TS1 TS0 DD Output Clock Period t T (temp) in K, s OUT V = V , V = GND 160T TS1 DD TS0 Figure 1 V = V , V = V 640T TS1 DD TS0 DD V = GND, V = GND 4T TS1 TS0 MAX6577, V = GND, V = V 1T TS1 TS0 DD Output Clock Frequency f T (temp) in K, Hz OUT V = V , V = GND T/4 TS1 DD TS0 Figure 2 V = V , V = V T/16 TS1 DD TS0 DD OUT Duty Cycle (Note 2) 0.5 V 0.8 IL Time-Select Pin Logic Levels V V 2.3 IH V > 4.5V, I = 3.2mA 0.4 DD SINK V OL V > 2.7V, I = 1.2mA 0.3 DD SINK OUT Voltage V V > 4.5V, I = 800A V - 1.5 DD SRC DD V OH V > 2.7V, I = 500A 0.8V DD SRC DD Note 1: See the Temperature Accuracy histograms in the Typical Operating Characteristics. Note 2: The output duty cycle is guaranteed to be 50% by an internal flip-flop. Maxim Integrated 2 www.maximintegrated.com