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Rev 0; 2/04
Low-Frequency Dual EconOscillator
General Description
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 EconOscillatorTM 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 Operating Temperature Range: -40C to +85C 100ppm/C Temp Drift (MAX)
DS1099
Applications
Flashing LED Status Indicators Consumer Appliances Automotive Servers Printers Switch-Mode Power Supplies
Ordering Information
PART DS1099U-0 1* TEMP RANGE -40C to +85C PIN-PACKAGE 8 SOP
*Where 0 and 1 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.
Typical Operating Circuit
VCC VCC
Pin Configuration
TOP VIEW
VCC OE0 OE1 N.C. N.C.
OUT1 1 OUT0 OUT1 OUT0 VCC 2 3
8 7
N.C. N.C. OE1 OEO
DS1099
GND
DS1099
6 5
GND 4 OE1 CAN INSTEAD BE TIED TO VCC IF OUT1 IS NOT USED. OUTPUTS CAPABLE OF SINKING 16mA
SOP
______________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Low-Frequency Dual EconOscillator DS1099
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 ...........................-40C to +85C Storage Temperature Range .............................-55C to +125C 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 = -40C to +85C)
PARAMETER Supply Voltage Input Logic 1 (OE0, OE1) Input Logic 0 (OE0, OE1) SYMBOL VCC VIH VIL CONDITIONS (Note 1) MIN 2.7 0.7 x VCC -0.3 TYP MAX 5.5 VCC + 0.3 +0.3 x VCC UNITS V V V
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted.)
PARAMETER Standby Supply Current Active Supply Current (Note 2) High-Level Output Voltage (OUT0, OUT1) Low-Level Output Voltage (OUT0, OUT1) High-Level Input Current (OE0, OE1) Low-Level Input Current (OE0, OE1) SYMBOL ISTBY ICC CONDITIONS OE0 = OE1 = VCC CL = 15pF per output, OE0 = OE1 = GND, VCC = 3.3V IOH = -1mA, VCC = MIN IOL = 16mA VIH = VCC VIL = 0.0V -1.0 1.048MHz (both) 4kHz (both) 1Hz (both) 2.4 0.4 +1.0 MIN TYP 145 323 146 145 V V A A A MAX 275 UNITS A
VOH VOL IIH IIL
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Low-Frequency Dual EconOscillator
AC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted.)
PARAMETER Master Oscillator Frequency Nominal Output Frequency Output Frequency Tolerance Voltage Frequency Variation (Note 3) Temperature Frequency Variation Output Duty Cycle Power-Up Time Output Rise/Fall Time tPU tR, tF (Note 5) CL = 15pF (both) SYMBOL fMOSC fOUT0, fOUT1 fOUT fOUT fOUT TA = +25C, VCC = 4.1V TA = +25C 2.7V to 5.5V, TA = +25C (Notes 3, 4) -2.0 -100 45 CONDITIONS MIN TYP 1.048 MAX UNITS MHz Hz % ppm/V +2.5 +100 55 10 20 % ppm/C % ms ns
DS1099
0.25 -1.0 3300
1,048,000 +1.0
Note 1: Note 2: Note 3: Note 4: Note 5:
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.
Typical Operating Characteristics
(VCC = +5.0V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE VCC = 15pF, TA = +25C
DS1099 toc01
SUPPLY CURRENT vs. TEMPERATURE VCC = 5.5V, CL = 15pF
DS1099 toc02
SUPPLY CURRENT vs. OUTPUT LOAD (BOTH OUTPUTS LOADED EQUALLY), TA = +25C
DS1099 toc03
700 600 SUPPLY CURRENT (A) OUT0 = OUT1 = 1MHz 500 400 300 200 100 0 2.7 3.4 4.1 4.8 OUT0 =1MHz, OUT1 = 0.25Hz
700 600 SUPPLY CURRENT (A) 500 400 300 200 100 OUT0 = OUT1 = 0.25Hz OUT0 =1MHz, OUT1 = 0.25Hz OUT0 = OUT1 = 1MHz
1.2 1.0 SUPPLY CURRENT (mA) VCC = 5.5V 0.8 0.6 0.4 0.2 0 0 10 20 CL (pF) 30 40 VCC = 2.7V VCC = 4.0V
OUT0 = OUT1 = 0.25Hz 0 5.5 -40 -15 10 35 60 85 SUPPLY VOLTAGE (V) TEMPERATURE (C) 50
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3
Low-Frequency Dual EconOscillator DS1099
Typical Operating Characteristics (continued)
(VCC = +5.0V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. VOLTAGE OEO = OE1 = VCC
DS1099 toc04
DUTY CYCLE vs. SUPPLY VOLTAGE OUT0 = OUT1 = 1MHz, CL = 15pF
DS1099 toc05
FREQUENCY CHANGE vs. SUPPLY VOLTAGE fOUT = 1MHz, TA = +25C, CL = 15pF
DS1099 toc06
180 170 SUPPLY CURRENT (A) 160 150 140 130 120 110 100 2.7 3.4 4.1 4.8 TA = +25C
52.0 TA = -40C DUTY CYCLE (% CHANGE) 51.0
1.0
FREQUENCY (% CHANGE) 5.5
0.5
50.0 TA = +25C 49.0 TA = +85C
0
-0.5
48.0 5.5 2.7 3.4 4.1 4.8 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V)
-1.0 2.7 3.4 4.1 4.8 5.5 SUPPLY VOLTAGE (V)
FREQUENCY CHANGE vs. TEMPERATURE fOUT = 1MHz, VCC = 4.0V, CL = 15pF
DS1099 toc07
OUTPUT VOLTAGE LOW vs. OUTPUT CURRENT
DS1099 toc08
OUTPUT VOLTAGE HIGH vs. OUTPUT CURRENT
VCC = 2.7V, TA = +25C
DS1099 toc09
1.0
0.5 VCC = 2.7V, TA = +25C 0.4 VOLTAGE (V)
2.8 2.7 2.6 VOH (V)
FREQUENCY (% CHANGE)
0.5
0.3
0
2.5 2.4 2.3 2.2 OUT0 OUT1
0.2 OUT0 OUT1
-0.5 0.1
-1.0 -40 -15 10 35 60 85 TEMPERATURE (C)
0 0 5 10 IOL (mA) 15 20
-5
-4
-3
-2
-1
0
IOH (mA)
Pin Description
PIN 1 2 3 4 5 6 7, 8 NAME OUT1 OUT0 VCC GND OE0 OE1 N.C. FUNCTION Oscillator Outputs. Each output is forced high when the corresponding OE is high. Positive Supply Terminal Ground Output Enable for OUT0 and OUT1, respectively. When low, the outputs are enabled. When high, the corresponding output is disabled (forced high). No Connection
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Low-Frequency Dual EconOscillator
Functional Diagram
DS1099
VCC VCC MASTER OSCILLATOR 1.048MHz fMOSC DIVIDER 0 DIVIDE BY 2X (X = X0 = 0...22) OUTPUT DRIVER fOUT0
DS1099
GND
OUT0
FACTORYPROGRAMMED EEPROM
DIVIDER 1 DIVIDE BY 2X (X = X1 = 0...22)
OUTPUT DRIVER
fOUT1
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 0 1 2 3 4 5 -- 19 20 21 22 DIVISOR 1 2 4 8 16 32 -- 524,288 1,048,576 2,097,152 4,194,304 fOUT0 OR fOUT1 1.048MHz 0.524MHz 0.262MHz 0.131MHz 65.50kHz 32.75kHz -- 2Hz 1Hz 0.5Hz 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.
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5
Low-Frequency Dual EconOscillator DS1099
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.
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 0.01F and 0.1F. 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
Ordering Information (continued)
A B C D E F G H J K L M N P Q R S T U W X Y Z DIVISOR 20 21 22 2
3
Package Information
For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo.
fOUT 1.048MHz 0.524MHz 0.262MHz 0.131MHz 65.50kHz 32.750kHz 16.375kHz 8.187kHz 4.093kHz 2.046kHz 1.023kHz 511.7Hz 255.8Hz 127.9Hz 63.96Hz 31.98Hz 16Hz 8Hz 4Hz 2Hz 1Hz 0.5Hz 0.25Hz
24 25 26 27 28 2
9
210 211 2 2
12
213
14
215 216 2
17
218 219 2
20
221 222
Branding Information
The package branding includes 0 and 1 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 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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