EVALUATION KIT AVAILABLE DS1856 Dual, Temperature-Controlled Resistors with Inter- nally Calibrated Monitors and Password Protection General Description Features SFF-8472 Compatible The DS1856 dual, temperature-controlled, nonvolatile Five Monitored Channels (Temperature, V , (NV) variable resistors with three monitors consists of CC two 256-position, linear, variable resistors three analog MON1, MON2, MON3) monitor inputs (MON1, MON2, MON3) and a direct-to- Three External Analog Inputs (MON1, MON2, MON3) digital temperature sensor. The device provides an That Support Internal and External Calibration ideal method for setting and temperature-compensating Scalable Dynamic Range for External Analog Inputs bias voltages and currents in control applications using Internal Direct-to-Digital Temperature Sensor minimal circuitry. The variable resistor settings are Alarm and Warning Flags for All Monitored stored in EEPROM memory and can be accessed over Channels the 2-wire serial bus. Two Linear, 256-Position, Nonvolatile Temperature- Relative to other members of the family, the DS1856 is Controlled Variable Resistors essentially a DS1859 with a DS1852-friendly memory Resistor Settings Changeable Every 2C map. In particular, the DS1856 can be configured so Three Levels of Security the 128 bytes of internal Auxiliary EEPROM memory is Access to Monitoring and ID Information mapped into Main Device Table 00h and Table 01h, Configurable with Separate Device Addresses maintaining compatibility between both the 2-Wire Serial Interface DS1858/DS1859 and the DS1852. The DS1856 also Two Buffers with TTL/CMOS-Compatible Inputs and features password protection equivalent to the DS1852, Open-Drain Outputs further enhancing compatibility between the two. Operates from a 3.3V or 5V Supply -40C to +95C Operating Temperature Range Applications Optical Transceivers Ordering Information Optical Transponders RES0/RES1 Instrumentation and Industrial Controls PART RESISTANCE PIN-PACKAGE RF Power Amps (k) Diagnostic Monitoring DS1856E-050 50/50 16 TSSOP DS1856E-050/T&R 50/50 16 TSSOP Typical Operating Circuit DS1856B-050 50/50 16 CSBGA Ordering Information continued at end of data sheet. V CC +Denotes lead-free package. V = 3.3V CC T&R denotes tape-and-reel package. Note: All devices are specified over the -40C to +95C tem- 4.7k 4.7k DECOUPLING perature range. 0.1F CAPACITOR 16 1 V CC SDA 2-WIRE 15 Pin Configurations 2 TO LASER BIAS H1 INTERFACE SCL 14 CONTROL 3 L1 OUT1 TOP VIEW TO LASER 13 Tx-FAULT 4 H0 SDA 1 16 V MODULATION CC IN1 12 A V IN1 SCL H1 CC DS1856 CONTROL L0 5 SCL 2 15 H1 OUT2 LOS 6 11 OUT1 3 14 L1 Rx POWER* B OUT2 SDA H0 L1 IN2 MON3 10 IN1 4 13 H0 7 DS1856 Tx POWER* DIAGNOSTIC N.C. MON2 INPUTS OUT2 5 12 L0 8 9 C Tx BIAS* N.C. IN2 OUT1 MON3 GND MON1 IN2 6 11 MON3 N.C. 7 10 MON2 D GND L0 MON1 MON2 *SATISFIES SFF-8472 COMPATIBILITY GND 8 9 MON1 1243 CSBGA (4mm x 4mm) TSSOP Visit www.maximintegrated.com/products/patents for 1.0mm PITCH product patent marking information. For pricing, delivery, and ordering information, please contact Maxim Direct at Rev 1 2/06 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.DS1856 Dual, Temperature-Controlled Resistors with Inter- nally Calibrated Monitors and Password Protection 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 OPERATING CONDITIONS (T = -40C to +95C, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) 2.85 5.50 V CC Input Logic 1 (SDA, SCL) V (Note 2) 0.7 x Vcc V + 0.3 V IH CC Input Logic 0 (SDA, SCL) 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-Impedance Resistor Current I 0.001 0.1 A ROFF Input logic 1 1.6 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 Low-Level Output Voltage OL1 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) Full-Scale V Monitor At factory setting (Note 5) 6.5208 6.5536 6.5864 V CC I/O Capacitance C 10 pF I/O Digital Power-On Reset POD 1.0 2.2 V Analog Power-On Reset POA 2.0 2.6 V 2 Maxim Integrated