MAX5427/MAX5428/MAX5429 19-2462 Rev 2 3/05 One-Time Programmable, Linear-Taper Digital Potentiometers General Description Features The MAX5427/MAX5428/MAX5429 linear-taper digital Wiper Position Stored After One-Time Fuse potentiometers function as mechanical potentiometers, Programming but replace the mechanics with a simple 2-wire digital User-Defined Power-On Reset Position interface. These digital potentiometers are unique in that they have an optional one-time programmable feature 35ppm/C End-to-End Temperature Coefficient that either sets the wipers power-on reset (POR) posi- and 5ppm/C Ratiometric Temperature Coefficient tion to a user-defined value, or the wiper can be set and 32 Tap Positions the interface disabled to prevent further adjustment. The MAX5427 has an end-to-end resistance of 100k , Tiny 8-Pin Thin QFN and MAX Packages the MAX5428 a resistance of 50k , and the MAX5429 a Ultra-Low 1.5A (max) Static Supply Current resistance of 10k . All these devices have 32 wiper positions, operate from a single 2.7V to 5.5V supply, and 2.7V to 5.5V Single-Supply Operation use less than 1.5A (max) static supply current. Wiper Position Programmed Through Simple The MAX5427/MAX5428/MAX5429 are available in 2-Wire Serial Interface 8-pin thin QFN and MAX packages. Each device is 10k , 50k , and 100k End-to-End Resistances guaranteed over the extended temperature range of -40C to +85C. Ordering Information Applications PART TEMP RANGE PIN-PACKAGE R (k ) Mechanical Potentiometer Replacement MAX5427EUA -40C to +85C 8 MAX 100 Products Using One-Time Factory Calibration MAX5427ETA -40C to +85C 8 Thin QFN-EP* 100 MAX5428EUA -40C to +85C 8 MAX 50 Pin Configurations MAX5428ETA -40C to +85C 8 Thin QFN-EP* 50 MAX5429EUA -40C to +85C 8 MAX 10 TOP VIEW MAX5429ETA -40C to +85C 8 Thin QFN-EP* 10 *EP = Exposed paddle. W H 1 8 Functional Block Diagram CS L 2 7 V U/D DD 3 6 H MAX5427 MAX5428 8 MAX5429 GND V 4 5 PP 3 V DD S 32 4 MAX5427 GND R 31 MAX MAX5428 MAX5429 S 31 R * 30 W H 1 8 2 S 30 CS 32- R W 1 UP/DOWN POSITION W CS L 2 7 COUNTER 6 DECODER U/D S 3 V U/D DD 3 MAX5427 6 R 2 MAX5428 MAX5429 ONE-TIME GND V 4 5 PP S PROGRAM 2 5 V BLOCK PP * R 1 QFN S 1 *EXPOSED PADDLE. CONNECTED TO GND. 7 L Max is a registered trademark of Maxim Integrated Products, Inc. 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. EVALUATION KIT AVAILABLEOne-Time Programmable, Linear-Taper Digital Potentiometers ABSOLUTE MAXIMUM RATINGS V to GND...........................................................-0.3V to +6.0V Continuous Power Dissipation (T = +70C) DD A V to GND..........................................................-0.3V to +12.0V 8-Pin MAX (derate 4.5mW/C above +70C) .............362mW PP All Other Pins to GND.................................-0.3V to (V + 0.3V) 8-Pin QFN-EP (derate 24.4mW/C above +70C)......1951mW DD Input and Output Latchup Immunity...............................200mA Operating Temperature Range ...........................-40C to +85C Maximum Continuous Current into H, L, and W Junction Temperature......................................................+150C MAX5427 .................................................................1.5mA Storage Temperature Range .............................-65C to +150C MAX5428 .................................................................1.5mA Lead Temperature (soldering, 10s) .................................+300C MAX5429 .................................................................2.0mA 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, V = GND, V = V , V = GND, T = -40C to +85C, unless otherwise noted. Typical values are at V = DD PP H DD L A DD 5.0V, T = +25C, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC PERFORMANCE Resolution 32 Taps MAX5427 75 100 125 End-to-End Resistance MAX5428 37.5 50 62.5 k MAX5429 7.5 10 12.5 End-to-End Resistance Tempco TC 35 ppm/C R MAX5427/MAX5428 5 Ratiometric Resistance Tempco ppm/C MAX5429 10 Potentiometer configuration, no load, Integral Nonlinearity INL 1 LSB Figure 1 Potentiometer configuration, no load, Differential Nonlinearity DNL 1 LSB Figure 1 Potentiometer configuration, no load, Full-Scale Error -0.5 LSB Figure 1 Potentiometer configuration, no load, Zero-Scale Error +0.5 LSB Figure 1 MAX5427 I = 20A MAX5428 I = 40A W W Wiper Resistance R 100 240 W MAX5429 I = 200A W DIGITAL INPUTS (CS, U/D) 0.7 x Input High Voltage V V IH V DD 0.3 x Input Low Voltage V V IL V DD Input Current I 0.1 1 A IN Input Capacitance C 5pF IN TIMING CHARACTERISTICS (Note 2) U/D Mode to CS Setup t Figures 2, 3 50 ns CU CS Hold to U/D Mode t Figures 2, 3 50 ns CI U/D Step Hold to CS t Figures 2, 3 0 ns IC U/D Step Low Time t Figures 2, 3 100 ns IL 2 MAX5427/MAX5428/MAX5429