Rev 1; 9/07 Low-Frequency Dual EconOscillator The DS1099 is a low-cost, low-power, low-frequency silicon oscillator that generates two square-wave outputs with frequencies between 0.25Hz and 1.048MHz. Individual output enables allow both outputs to be enabled/disabled independently. Both outputs are capable of sinking 16mA, allowing them to directly interface to light-emitting diodes (LEDs) as well as other external circuitry. The DS1099 operates over a wide supply voltage, making it suitable for both 3V and 5V systems. The device is shipped from the factory custom programmed and calibrated, ready to be inserted into the end application. Contact the factory for custom frequencies or requirements. Features ♦ Low-Cost, Low-Frequency EconOscillator™ with Dual Outputs ♦ Factory Programmed ♦ Output Frequencies Independently Programmable from 0.25Hz to 1.048MHz ♦ 2.7V to 5.5V Single-Supply Operation ♦ No External Timing Components Required ♦ Independent Output Enables ♦ CMOS/TTL-Compatible Outputs ♦ Oscillator Outputs Capable of Sinking 16mA to Directly Drive LEDs ♦ Relieves Microprocessor of Periodic Interrupt ♦ Low-Power Consumption Applications Flashing LED Status Indicators ♦ Operating Temperature Range: -40°C to +125°C ♦ ±100ppm/°C Temp Drift (MAX) Consumer Appliances Ordering Information Automotive Servers PART TEMP RANGE Printers DS1099U- O 1 -40°C to +125°C Switch-Mode Power Supplies PIN-PACKAGE 8 μSOP *Where α0 and α1 specify the factory programmed divider settings for OUT0 and OUT1, respectively. Ordering information is continued on the last page. EconOscillator is a trademark of Dallas Semiconductor. Pin Configuration Typical Operating Circuit VCC VCC TOP VIEW VCC OE0 OE1 N.C. N.C. DS1099 OUT0 OUT1 GND OUT1 1 8 N.C. OUT0 2 7 N.C. VCC 3 6 OE1 5 OEO DS1099 GND 4 OE1 CAN INSTEAD BE TIED TO VCC IF OUT1 IS NOT USED. OUTPUTS CAPABLE OF SINKING 16mA μSOP ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 DS1099 General Description DS1099 Low-Frequency Dual EconOscillator ABSOLUTE MAXIMUM RATINGS Voltage Range on VCC Relative to Ground ...........-0.5V to +6.0V Voltage Range on OE0 and OE1 Relative to Ground.................................-0.5V to (VCC + 0.5V), not to exceed 6.0V Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range .............................-55°C to +125°C Soldering Temperature .......................................See IPC/JEDEC J-STD-020A 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 (TA = -40°C to +125°C) PARAMETER Supply Voltage SYMBOL VCC CONDITIONS (Note 1) MIN 2.7 TYP MAX 5.5 UNITS V Input Logic 1 (OE0, OE1) VIH 0.7 x VCC VCC + 0.3 V Input Logic 0 (OE0, OE1) VIL -0.3 +0.3 x VCC V TYP MAX UNITS 145 275 μA DC ELECTRICAL CHARACTERISTICS (VCC = +2.7V to +5.5V, TA = -40°C to +125°C, unless otherwise noted.) PARAMETER Standby Supply Current Active Supply Current (Note 2) SYMBOL I STBY ICC CONDITIONS CL = 15pF per output, OE0 = OE1 = GND, VCC = 3.3V 1.048MHz (both) 323 4kHz (both) 146 1Hz (both) 145 High-Level Output Voltage (OUT0, OUT1) VOH I OH = -1mA, VCC = MIN Low-Level Output Voltage (OUT0, OUT1) VOL I OL = 16mA (-40°C to +85°C) I OL = 12mA (-40°C to +125°C) High-Level Input Current (OE0, OE1) I IH VIH = VCC Low-Level Input Current (OE0, OE1) I IL VIL = 0.0V 2 MIN OE0 = OE1 = VCC μA 2.4 -1.0 _______________________________________________________________________________________ V 0.4 V +1.0 μA μA Low-Frequency Dual EconOscillator (VCC = +2.7V to +5.5V, TA = -40°C to +125°C, unless otherwise noted.) PARAMETER Master Oscillator Frequency SYMBOL fMOSC Nominal Output Frequency fOUT0, fOUT1 Output Frequency Tolerance ΔfOUT Voltage Frequency Variation (Note 3) ΔfOUT Temperature Frequency Variation ΔfOUT CONDITIONS MIN 0.25 TA = +25°C, VCC = 4.1V Output Rise/Fall Time t R , tF UNITS MHz 1,048,000 Hz +1.0 TA = +25°C tPU MAX -1.0 % 3300 ppm/V 2.7V to 5.5V, TA = +25°C -2.0 +2.5 % (Notes 3, 4) -100 +100 ppm/°C 45 Output Duty Cycle Power-Up Time TYP 1.048 55 % (Note 5) 10 ms CL = 15pF (both) 20 ns All voltages referenced to ground. Active supply current combines the standby current with the output current. The output current is defined by I = (CLOAD + 12pF ) x VCC x fOUT for each output when enabled. This is the change observed in output frequency due to changes in temperature or voltage. This parameter is guaranteed by design. This indicates the time between power-up and the outputs becoming active. Note 1: Note 2: Note 3: Note 4: Note 5: Typical Operating Characteristics (VCC = +5.0V, TA = +25°C, unless otherwise noted.) 400 300 OUT0 =1MHz, OUT1 = 0.25Hz OUT0 = OUT1 = 1MHz 500 400 OUT0 =1MHz, OUT1 = 0.25Hz 300 200 VCC = 5.5V 0.8 VCC = 4.0V 0.6 0.4 0.2 OUT0 = OUT1 = 0.25Hz 100 100 1.0 SUPPLY CURRENT (mA) 500 200 600 SUPPLY CURRENT (μA) OUT0 = OUT1 = 1MHz 1.2 DS1099 toc02 600 SUPPLY CURRENT (μA) 700 DS1099 toc01 700 SUPPLY CURRENT vs. OUTPUT LOAD (BOTH OUTPUTS LOADED EQUALLY), TA = +25°C SUPPLY CURRENT vs. TEMPERATURE VCC = 5.5V, CL = 15pF DS1099 toc03 SUPPLY CURRENT vs. SUPPLY VOLTAGE CL = 15pF, TA = +25°C VCC = 2.7V OUT0 = OUT1 = 0.25Hz 0 0 2.7 3.4 4.1 SUPPLY VOLTAGE (V) 4.8 5.5 0 -40 -15 10 35 TEMPERATURE (°C) 60 85 0 10 20 30 40 50 CL (pF) _______________________________________________________________________________________ 3 DS1099 AC ELECTRICAL CHARACTERISTICS Typical Operating Characteristics (continued) (VCC = +5.0V, TA = +25°C, unless otherwise noted.) DUTY CYCLE (% CHANGE) SUPPLY CURRENT (μA) 160 150 140 130 120 51.0 50.0 TA = +25°C 49.0 1.0 TA = +85°C DS1099 toc06 TA = -40°C FREQUENCY CHANGE vs. SUPPLY VOLTAGE fOUT = 1MHz, TA = +25°C, CL = 15pF FREQUENCY (% CHANGE) TA = +25°C 170 52.0 DS1099 toc04 180 DUTY CYCLE vs. SUPPLY VOLTAGE OUT0 = OUT1 = 1MHz, CL = 15pF DS1099 toc05 SUPPLY CURRENT vs. VOLTAGE OEO = OE1 = VCC 0.5 0 -0.5 110 48.0 3.4 4.1 4.8 5.5 -1.0 2.7 3.4 SUPPLY VOLTAGE (V) 4.1 4.8 5.5 2.7 3.4 SUPPLY VOLTAGE (V) FREQUENCY CHANGE vs. TEMPERATURE fOUT = 1MHz, VCC = 4.0V, CL = 15pF 4.8 5.5 OUTPUT VOLTAGE HIGH vs. OUTPUT CURRENT OUTPUT VOLTAGE LOW vs. OUTPUT CURRENT 0.5 DS1099 toc07 1.0 4.1 SUPPLY VOLTAGE (V) 2.8 DS1099 toc08 2.7 VCC = 2.7V, TA = +25°C 0.4 DS1099 toc09 100 VCC = 2.7V, TA = +25°C 2.7 0.5 0 -0.5 2.6 0.3 VOH (V) VOLTAGE (V) FREQUENCY (% CHANGE) DS1099 Low-Frequency Dual EconOscillator 2.3 2.2 0 -40 -15 10 35 60 85 OUT0 OUT1 2.4 OUT0 OUT1 0.1 -1.0 2.5 0.2 0 TEMPERATURE (°C) 5 10 15 20 -5 -4 -3 -2 -1 0 IOH (mA) IOL (mA) Pin Description 4 PIN NAME 1 OUT1 2 OUT0 FUNCTION Oscillator Outputs. Each output is forced high when the corresponding OE is high. 3 VCC Positive Supply Terminal 4 GND Ground 5 OE0 6 OE1 Output Enable for OUT0 and OUT1, respectively. When low, the outputs are enabled. When high, the corresponding output is disabled (forced high). 7, 8 N.C. No Connection _______________________________________________________________________________________ Low-Frequency Dual EconOscillator VCC MASTER OSCILLATOR 1.048MHz VCC GND DS1099 fMOSC FACTORYPROGRAMMED EEPROM DIVIDER 0 DIVIDE BY 2X (X = X0 = 0...22) OUTPUT DRIVER fOUT0 DIVIDER 1 DIVIDE BY 2X (X = X1 = 0...22) OUTPUT DRIVER fOUT1 OUT0 OUT1 OE0 OE1 Detailed Description The DS1099 consists of a fixed-frequency 1.048MHz master oscillator followed by two independent factoryprogrammable dividers. The two divider outputs are connected to pins OUT0 and OUT1, which are inde- Table 1. Divider Settings and Output Frequencies DIVIDER SETTING X0 OR X1 DIVISOR fOUT0 OR fOUT1 0 1 1.048MHz 1 2 0.524MHz 2 4 0.262MHz 3 8 0.131MHz 4 16 65.50kHz 5 32 32.75kHz — — — 19 524,288 2Hz 20 1,048,576 1Hz 21 2,097,152 0.5Hz 22 4,194,304 0.25Hz pendently enabled/disabled using the output-enable pins, OE0 and OE1, respectively. When the outputenable pins are active (low), the corresponding outputs are enabled. If either output-enable pin is tied to its inactive state (high), then the corresponding output is disabled and forced high immediately. The outputenable pins only disable the corresponding output driver(s) and do not shut down the master oscillator or the dividers. Since the master oscillator frequency, fMOSC, is fixed, the frequency of OUT0 and OUT1 is determined by DIVIDER 0 and DIVIDER 1, respectively. And since each output has its own divider, fOUT0 and fOUT1 can be programmed independent of each other. The frequency of the outputs are calculated as follows: fOUT0 = fMOSC / 2X0 = 1.048MHz / 2X0 fOUT1 = fMOSC / 2X1 = 1.048MHz / 2X1 where X 0 is the DIVIDER 0 setting and X 1 is the DIVIDER 1 setting. Valid values for X0 and X1 are integers 0 to 22 (dec). Table 1 shows output frequencies and divider values for the range of divider settings. _______________________________________________________________________________________ 5 DS1099 Functional Diagram DS1099 Low-Frequency Dual EconOscillator The divider settings, X 0 and X 1 , are factory programmed. When placing an order for the DS1099, it is required to specify X0 and X1. If only one output is used, it is recommended that the unused output be disabled. The oscillator outputs are asynchronous. Since the master oscillator and dividers are free running, even when both outputs are disabled, the state of the output when OE becomes active is unknown for up to half an fOUT period. When OE is brought low, the output is enabled instantaneously. Likewise, if the output is disabled while outputting the low half of a cycle, the output instantaneously is forced high before the current cycle is completed. Ordering Information (continued) α DIVISOR A 20 fOUT 1.048MHz B 21 0.524MHz C 22 0.262MHz D 23 0.131MHz E 2 4 F 25 32.750kHz G 26 16.375kHz H 27 8.187kHz J 28 4.093kHz K 2 9 2.046kHz L 210 1.023kHz M 211 511.7Hz N 12 2 255.8Hz P 213 127.9Hz Q 214 63.96Hz R 15 2 31.98Hz S 216 16Hz T 217 8Hz U 18 2 4Hz W 219 2Hz X 220 1Hz Y 2 21 Z 222 Application Information Power-Supply Decoupling To achieve best results, it is highly recommended that a decoupling capacitor is used on the IC power-supply pins. Typical values of decoupling capacitors are 0.01µF and 0.1µF. Use a high-quality, ceramic, surface-mount capacitor, and mount it as close as possible to the VCC and GND pins of the IC to minimize lead inductance. Chip Topology TRANSISTOR COUNT: 4221 SUBSTRATE CONNECTED TO GROUND Package Information For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo. Revision History Pages changed at Rev 1: 1, 2, 3, 5, 6 65.50kHz 0.5Hz 0.25Hz Branding Information The package branding includes α0 and α1 on the top of the package next to or below 1099. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.