DS1857 Rev 1 6/04 Dual Temperature-Controlled Resistors with External Temperature Input and Monitors General Description Features The DS1857 dual temperature-controlled nonvolatile Four Total Monitored Channels (Temperature, (NV) variable resistors with external temperature input V , MON1, MON2) CC and monitors consists of two 50k 256-position linear Two External Analog Inputs (MON1, MON2) variable resistors, two analog monitor inputs (MON1, Interface to External Temperature Sensor (LM50) MON2), and an external temperature sensor input. The device provides an ideal method for setting and tem- Two 50k, Linear, 256-Position, Nonvolatile perature-compensating bias voltages and currents in Temperature-Controlled Variable Resistors control applications using minimal circuitry. The vari- Resistor Settings Changeable Every 2C able resistor settings are stored in EEPROM memory Access to Monitoring and ID Information and can be accessed over the 2-wire serial bus. Configurable with Separate Device Addresses Resistor Disable (Open-Circuit) Function 2-Wire Serial Interface Three Address Lines for Multiple Devices Operates from a 3.3V or 5V Supply Applications SFF-8472 Compatible Optical Transceivers Optical Transponders Ordering Information Instrumentation and Industrial Controls RF Power Amps PART TEMP RANGE PIN-PACKAGE DS1857E-050 -40C to +95C 16 TSSOP Diagnostic Monitoring 16 TSSOP DS1857E-050/T&R -40C to +95C (Tape-and-Reel) DS1857B-050 -40C to +95C 16 Ball CSBGA Typical Operating Circuit Pin Configurations V CC V = 3.3V CC 4.7k 4.7k TOP VIEW DECOUPLING 0.1F CAP 1 16 SDA V 1 SDA V 16 CC CC 2-WIRE A A1 SCL V H1 CC INTERFACE 2 15 TO LASER BIAS 2 SCL SCL H1 15 H1 V CONTROL CC 3 14 3 A0 L1 14 A0** L1 B A2 SDA H0 L1 4 13 TO LASER MODULATION 4 A1 13 H0 A1** DS1857 H0 CONTROL DS1857 5 12 5 A2 L0 12 A2** L0 C RHIZ WPEN A0 EXTTMP GROUND TO WPEN 11 11 6 EXTTMP DISABLE WRITE 6 TO EXTERNAL TEMPERATURE WPEN EXTTMP PROTECT SENSOR, SUCH AS LM50 RHIZ MON2 10 10 7 Tx DISABLE 7 Rx POWER* RHIZ MON2 DIAGNOSTIC D GND L0 MON1 MON2 INPUTS 8 GND MON1 9 9 8 Tx BIAS* 0 TO 2.5V FS GND MON1 1243 16-BALL CSBGA (4mm x 4mm) 16 TSSOP *Rx POWER AND Tx BIAS CAN BE ARBITRARILY 1.0mm PITCH ASSIGNED TO THE MON INPUTS. **ADDRESS INPUTS DETERMINE THE MAIN DEVICE 2-WIRE SLAVE ADDRESS WHEN ADFIX = 0. THIS ADDRESS MUST BE DIFFERENT THAN THE AUX DEVICE ADDRESS WHEN ADEN = 0. 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.Dual Temperature-Controlled Resistors with External Temperature Input and Monitors ABSOLUTE MAXIMUM RATINGS Voltage on V Relative to Ground.......................-0.5V to +6.0V Operating Temperature Range ...........................-40C to +95C CC Voltage 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 on Resistor Inputs Relative Soldering Temperature .......................................See IPC/JEDEC to Ground* ................................................-0.5V to V + 0.5V J-STD-020A Specification 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) +3.0 5.5 V CC Input Logic 1 (SDA, SCL, A2, A1, A0, V (Note 2) 0.7 x Vcc V + 0.3 V IH CC WPEN, RHIZ) Input Logic 0 (SDA, SCL, A2, A1, A0, V (Note 2) -0.3 0.3 x V V IL CC WPEN, RHIZ) Resistor Inputs (L0, L1, H0, H1) -0.3 V + 0.3 V CC Resistor Current I -3 +3 mA RES DC ELECTRICAL CHARACTERISTICS (V = 3.0V 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 -1 +1 A IL Input Current each I/O Pin 0.4 x V < V < 0.9 x V -10 +10 A CC I/O CC V 3mA sink current 0 0.4 OL1 Low-Level Output Voltage (SDA) V V 6mA sink current 0 0.6 OL2 Full-Scale Input (MON1, MON2) (Note 4) 2.4875 2.5000 2.5125 V Full-Scale V Monitor (Note 5) 6.5208 6.5536 6.5864 V CC I/O Capacitance C 10 pF I/O WPEN Pullup Resistor R 40 65 100 k WPEN RHIZ Pullup Resistor R 40 65 100 k RHIZ Digital Power-On Reset POD 1.0 2.2 V Analog Power-On Reset POA 2.0 2.6 V 2 DS1857