DS1864 Rev 0 4/06 SFP Laser Controller and Diagnostic IC General Description Features SFF-8472 MSA Compatible The DS1864 is an SFF-8472 multisource agreement (MSA)-compliant laser controller/monitor that is ideal for Five Monitored Channels (Temperature, V , CC SFP optical-transceiver module designs. It controls laser MON1, MON2, MON3) driver bias and modulation currents through a pair of tem- Three External Analog Inputs (MON1, MON2, perature-controlled current-sink DACs. System diagnos- MON3) Support Internal and External tics are provided by monitoring three analog inputs, V , Calibration CC and temperature through the internal temperature sensor. Enhanced RSSI Monitoring (26dB Range, 0.5dB Accuracy) The device also contains all EEPROM required by the Scalable Dynamic Range for External Analog SFF-8472 MSA, including all A0h and A2h EEPROM. The Inputs DS1864s memory map can be configured to be compati- Internal Direct-to-Digital Temperature Sensor ble with both the DS1852/DS1856 and the DS1859 mem- Alarm and Warning Flags for All Monitored ory maps. Additionally, memory is secured with customer- Channels configurable two-level password protection. Two Linear 8-Bit Current-Sink DACs Eye-safety features are integrated by three fast-trip Two User-Selectable Full-Scale Ranges (0.5mA comparators that monitor transmit-power high, transmit- or 1.5mA) power low, and bias current. The fast-trip comparators Values Changeable Every 2C drive a FET driver output to disable the laser in the case Three Fast-Trip Comparators (Tx Power High, of eye safety violation. Tx Power Low, and Bias Current) for Eye Safety With its integrated laser driver control, system diagnos- Flexible, Two Level Password Scheme Provides tics, eye-safety features, and internal temperature sen- Three Levels of Security sor, the DS1864 provides an ideal solution for SFP Provides All Optional and Required SFF-8472 optical transceiver modules by improving system perfor- MSA EEPROM (Both A0h and A2h Memory) mance, reducing board space, and simplifying design. 2 I C-Compatible Serial Interface Applications Operates from a 3.3V or 5V Supply SFP Optical Transceiver Modules -40C to +95C Operating Temperature Range Laser Control and Monitoring 28-Pin TQFN Package (5mm x 5mm) Pin Configuration Ordering Information PART TEMP RANGE PIN-PACKAGE TOP VIEW DS1864T -40C to +95C 28 TQFN (5mm x 5mm) DS1864T+ -40C to +95C 28 TQFN (5mm x 5mm) 28 27 26 25 24 23 22 +Denotes lead-free only package. RSELOUT 1 21 V CC SDA 2 20 DAC0 SCL 3 19 GND INTX-F 4 18 DAC1 DS1864 INLOS MON1P 5 17 IN1 6 16 MON1N 7 N.C. N.C. 15 8 9 10 11 12 13 14 Typical Operating Circuit appears at end of data sheet. TQFN 5mm x 5mm 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. V N.C. CC GND OUT1 TX-D RX-LOS TX-F RSEL FETG MON3N MON3P GND MON2 N.C.SFP Laser Controller and Diagnostic IC ABSOLUTE MAXIMUM RATINGS Voltage Range on V Relative to Ground ...........-0.5V to +6.0V Current into DAC Pins...........................................................5mA CC Voltage Range on Inputs Relative to Ground*.................-0.5V to Operating Temperature Range ...........................-40C to +95C (V + 0.5V) Programming Temperature Range .........................0C to +70C CC Voltage Range on DAC Pins Relative to Ground*............-0.5V to Storage Temperature Range .............................-55C to +125C (V + 0.5V) Soldering Temperature............See IPC/J-STD-020 Specification CC *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) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) 2.97 5.50 V CC +0.3 x Input Logic 0 (SDA, SCL) V I (max) = -10A -0.3 V IL IL V CC 0.7 x V + CC Input Logic 1 (SDA, SCL) V I (max) = 10A V IH IH V 0.3 CC V Input Logic 0 -0.3 0.9 IL Input Logic Levels (TX-D, INLOS, V V + CC RSEL, IN1) V Input Logic 1 1.5 IH 0.3 DC ELECTRICAL CHARACTERISTICS (V = 2.97V to 5.5V, T = -40C to +95C.) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I (Notes 2 and 3) 3 5 mA CC Input Leakage (SDA, SCL) I -1 +1 A IL V 3mA sink current 0.4 OL1 Low-Level Output Voltage (SDA) V V 6mA sink current 0.6 OL2 I/O Capacitance C For SDA/SCL 10 pF I/O TX-D Pullup Resistor R T = +25C 14 20 24 k PU A Digital Power-On Reset V 1.0 2.2 V POD Analog Power-On Reset V 2.00 2.97 V POA High-Level Output Voltage V - V + CC CC V 4mA source current V OH (FETG) 0.4 0.3 Low-Level Output Voltage (TX-F, V 4mA sink current 0.0 0.4 V OL LOS Voltage, FETG) Input Current Each I/O Pin 0.4 < V < 0.9V -10 +10 A I/O CC 2 DS1864