DS1859 Rev 4 2/06 Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors General Description Features The DS1859 dual, temperature-controlled, nonvolatile SFF-8472 Compatible (NV) variable resistors with three monitors consists of Five Monitored Channels (Temperature, V , CC two 50k or two 20k , 256-position, linear, variable MON1, MON2, MON3) resistors three analog monitor inputs (MON1, MON2, Three External Analog Inputs (MON1, MON2, MON3) MON3) and a direct-to-digital temperature sensor. The That Support Internal and External Calibration device provides an ideal method for setting and tem- Scalable Dynamic Range for External Analog Inputs perature-compensating bias voltages and currents in Internal Direct-to-Digital Temperature Sensor control applications using minimal circuitry. The vari- Alarm and Warning Flags for All Monitored able resistor settings are stored in EEPROM memory Channels and can be accessed over the 2-wire serial bus. Two 50k or Two 20k , Linear, 256-Position, Nonvolatile Temperature-Controlled Variable Resistors Resistor Settings Changeable Every 2C Access to Monitoring and ID Information Configurable with Separate Device Addresses Applications 2-Wire Serial Interface Optical Transceivers Two Buffers with TTL/CMOS-Compatible Inputs and Optical Transponders Open-Drain Outputs Operates from a 3.3V or 5V Supply Instrumentation and Industrial Controls Operating Temperature Range of -40C to +95C RF Power Amps Diagnostic Monitoring Ordering Information PART RESISTANCE PIN-PACKAGE DS1859B-020 20k 16 CSBGA DS1859B-020+ 20k 16 CSBGA Typical Operating Circuit DS1859B-050 50k 16 CSBGA DS1859B-050+ 50k 16 CSBGA +Denotes lead-free package. V CC Ordering Information continued at end of data sheet. V = 3.3V CC 4.7k 4.7k DECOUPLING 0.1F CAP 16 Pin Configurations 1 V CC SDA 2-WIRE 15 2 TO LASER BIAS H1 INTERFACE SCL 14 CONTROL 3 L1 TOP VIEW OUT1 TO LASER 13 Tx-FAULT 4 1 SDA V CC 16 H0 A MODULATION V IN1 IN1 SCL CC H1 12 L0 CONTROL 2 SCL 15 5 H1 DS1859 OUT2 LOS 3 OUT1 6 L1 14 11 Rx POWER* B OUT2 SDA H0 L1 IN2 MON3 4 IN1 13 H0 10 7 Tx POWER* GROUND TO DIAGNOSTIC WPEN MON2 DS1859 5 OUT2 L0 12 DISABLE WRITE INPUTS 8 9 Tx BIAS* C WPEN IN2 OUT1 MON3 PROTECT GND MON1 IN2 11 6 MON3 10 7 WPEN MON2 D GND L0 MON1 MON2 *SATISFIES SFF-8472 COMPATIBILITY GND MON1 8 9 1243 CSBGA (4mm x 4mm) TSSOP 1.0mm PITCH 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 AVAILABLEDual, Temperature-Controlled Resistors with Internally Calibrated Monitors ABSOLUTE MAXIMUM RATINGS Voltage Range on V Relative to Ground ...........-0.5V to +6.0V Operating Temperature Range ...........................-40C to +95C CC Voltage Range on Inputs Relative Programming Temperature Range .........................0C to +70C to Ground* ................................................-0.5V to V + 0.5V Storage Temperature Range .............................-55C to +125C CC Voltage Range on Resistor Inputs Relative Soldering Temperature .......................................See IPC/JEDEC to Ground* ................................................-0.5V to V + 0.5V J-STD-020A CC Current into Resistors............................................................5mA *Not to exceed 6.0V. 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 = -40C to +95C, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) 2.85 5.5 V CC Input Logic 1 (SDA, SCL, WPEN) V (Note 2) 0.7 x Vcc V + 0.3 V IH CC Input Logic 0 (SDA, SCL, WPEN) V (Note 2) -0.3 +0.3 x V V IL CC Resistor Inputs (L0, L1, H0, H1) -0.3 V + 0.3 V CC Resistor Current I -3 +3 mA RES High-Z Resistor Current I 0.001 0.1 A ROFF Input logic 1 1.5 Input Logic Levels (IN1, IN2) V Input logic 0 0.9 DC ELECTRICAL CHARACTERISTICS (V = 2.85V to 5.5V, T = -40C to +95C, unless otherwise noted.) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I (Note 3) 1 2 mA CC Input Leakage I -200 +200 nA IL V 3mA sink current 0 0.4 OL1 Low-Level Output Voltage V (SDA, OUT1, OUT2) V 6mA sink current 0 0.6 OL2 Full-Scale Input (MON1, MON2, At factory setting 2.4875 2.5 2.5125 V MON3) (Note 4) At factory setting Full-Scale V Monitor 6.5208 6.5536 6.5864 V CC (Note 5) I/O Capacitance C 10 pF I/O WPEN Pullup R 40 65 100 k WPEN Digital Power-On Reset POD 1.0 2.2 V Analog Power-On Reset POA 2.0 2.6 V 2 DS1859