DS3903 Rev 0 6/02 Triple 128-Position Nonvolatile Digital Potentiometer General Description Features The DS3903 contains three nonvolatile (NV) low tem- Three 128-Position Linear Potentiometers perature coefficient digital potentiometers, which can (Two 10k , One 90k ) be accessed through a 2-wire bus. It operates in both NV Wiper Storage 3V and 5V systems, and it features a write-protect pin that can lock the positions of the potentiometers. An 0 to 5.5V on Any Potentiometer Terminal address pin allows two DS3903s to be placed on the Independent of V CC same 2-wire bus. Low End-to-End Temperature Coefficient Applications Operates on an Industry-Standard 2-Wire Bus Power-Supply Calibration Write-Protect Pin Mobile Phones and PDAs Supply Voltage: 3V or 5V Fiber Optics Transceiver Modules Operating Temperature Range: -40C to +85C Portable Electronics Packaging: 20-Pin TSSOP A Small, Low-Cost Replacement for Mechanical Potentiometers Ordering Information PART TEMP RANGE PIN-PACKAGE DS3903E-020 -40C to +85C 20 TSSOP 20 TSSOP DS3903E-020/T&R -40C to +85C (Tape-and-Reel) Pin Configuration Typical Operating Circuit V SDA CC 1 20 V CC V CC SCL 2 19 N.C. 5.1k DS3903 0.1F V CC A0 3 18 N.C. Iref VARIABLE RESISTANCE POTENTIOMETER 2 FOR ADJUSTABLE 10k 4.7k 4.7k CURRENT SOURCE WP 4 17 N.C. ADDDR FAh SCL V N.C. 5 DS3903 16 N.C. 2-WIRE CC MASTER SDA L0 6 15 H0 POTENTIOMETER 0 10k VREF1 HIGH-OUTPUT-IMPEDANCE ADDDR F9h VOLTAGE REFERENCE W1 7 14 W0 WP A0 V CC L1 8 13 H1 W2 POTENTIOMETER 1 L2 9 12 90k ADDDR F8h GND 10 11 H2 VREF2 GND BUFFERED VOLTAGE REFERENCE TSSOP MAX427 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.Triple 128-Position Nonvolatile Digital Potentiometer ABSOLUTE MAXIMUM RATINGS Voltage on V Pin Relative to Ground.................-0.5V to +6.0V Current Through W0, W1, and W2......................................4mA CC Voltage on SDA, SCL, A0, and WP Operating Temperature Range ...........................-40C to +85C Relative to Ground ...........................................................-0.5V to Programming Temperature Range .........................0C to +70C V + 0.5V Storage Temperature Range .............................-55C to +125C CC Voltage on L0, L1, L2, W0, W1, W2, H0, H1, and Soldering Temperature ....................See IPC/JEDEC J-STD-020A H2 Relative to Ground...........................................-0.5V to +6.0V Specification 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. RECOMMENDED DC OPERATING CONDITIONS (T = -40 to +85C) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) +2.7 +5.5 V CC Input Logic 1 V (Notes 2, 3) 0.7 x V V + 0.3 V IH CC CC Input Logic 0 V (Notes 2, 3) -0.3 0.3 x V V IL CC Wiper Current I -3 +3 mA W Resistor Terminals L0, L1, L2, W0, W1, W2, V = +2.7V to +5.5V -0.3 +5.5 V CC H0, H1, H2 DC ELECTRICAL CHARACTERISTICS (V = 2.7V to 5.5V, T = -40C to +85C.) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Leakage I -1 +1 A L V = 3V (Note 2) 100 200 CC Standby Supply Current I A stby V = 5V (Note 2) 150 250 CC V 3mA sink current 0 0.4 V OL1 Low-Level Output Voltage (SDA) V 6mA sink current 0 0.6 V OL2 I/O Capacitance C 10 pF I/O WP Internal Pullup Resistance R 35 65 110 k WP 2 DS3903