general description the ds1099 is a low-cost, low-power, low-frequency silicon oscillator that generates two square-wave out - puts 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 require - ments. applications flashing led status indicators consumer appliances servers printers switch-mode power supplies 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 operating temperature range: -40c to +125c 100ppm/c temp drift (max) 19-7629; rev 2; 5/15 econoscillator is a trademark of maxim integrated products, inc. ordering information is continued on the last page. *where 0 and 1 specify the factory-programmed divider settings for out0 and out1, respectively. part temp range pin-package ds1099u- a o a 1 -40c to +125c 8 sop ordering information out0out1 gnd oe0 v cc v cc v cc oe1n.c. n.c. oe1 can instead be tied to v cc if out1 is not used. outputs capable of sinking 16ma ds1099 oe1 oeo gnd 12 8 7 n.c. n.c. out0 v cc out1 sop top view 3 4 6 5 ds1099 pin coniguration typical operating circuit ds1099 low-frequency dual econoscillator downloaded from: http:///
voltage range on v cc relative to ground ......... -0.5v to +6.0v voltage range on oe0 and oe1 relative to ground .................................. -0.5v to (v cc + 0.5v), not to exceed 6.0v operating temperature range ......................... -40c to +125c 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. (v cc = +2.7v to +5.5v, t a = -40c to +125c, unless otherwise noted.) (t a = -40c to +125c) parameter symbol conditions min typ max units standby supply current i stby oe0 = oe1 = v cc 145 275 a active supply current (note 2) i cc c l = 15pf per output, oe0 = oe1 = gnd, v cc = 3.3v 1.048mhz (both) 323 a 4khz (both) 146 1hz (both) 145 high-level output voltage (out0, out1) v oh i oh = -1ma, v cc = min 2.4 v low-level output voltage(out0, out1) v ol i ol = 16ma (-40c to +85c) i ol = 12ma (-40c to +125c) 0.4 v high-level input current( oe0 , oe1 ) i ih v ih = v cc +1.0 a low-level input current( oe0 , oe1 ) i il v il = 0.0v -1.0 a parameter symbol conditions min typ max units supply voltage v cc (note 1) 2.7 5.5 v input logic 1 ( oe0 , oe1 ) v ih 0.7 x v cc v cc + 0.3 v input logic 0 ( oe0 , oe1 ) v il -0.3 +0.3 x v cc v dc electrical characteristics recommended dc operating conditions absolute maximum ratings ds1099 low-frequency dual econoscillator www.maximintegrated.com maxim integrated 2 downloaded from: http:///
(v cc = +5.0v, t a = +25c, unless otherwise noted.) note 1: all voltages referenced to ground. note 2: active supply current combines the standby current with the output current. the output current is defined by i = (c load + 12pf ) x v cc x f out for each output when enabled. note 3: this is the change observed in output frequency due to changes in temperature or voltage. note 4: this parameter is guaranteed by design. note 5: this indicates the time between power-up and the outputs becoming active. (v cc = +2.7v to +5.5v, t a = -40c to +125c, unless otherwise noted.) parameter symbol conditions min typ max units master oscillator frequency f mosc 1.048 mhz nominal output frequency f out0 , f out1 0.25 1,048,000 hz output frequency tolerance ?f out t a = +25c, v cc = 4.1v -1.0 +1.0 % voltage frequency variation(note 3) ?f out t a = +25c 3300 ppm/v 2.7v to 5.5v, t a = +25c -2.0 +2.5 % temperature frequency variation ?f out (notes 3, 4) -100 +100 ppm/c output duty cycle 45 55 % power-up time t pu (note 5) 10 ms output rise/fall time t r , t f c l = 15pf (both) 20 ns supply current vs. output load (both outputs loaded equally), t a = +25 c ds1099 toc03 c l (pf) supply current (ma) 40 30 20 10 0.2 0.4 0.6 0.8 1.0 1.2 0 0 50 v cc = 5.5v v cc = 4.0v v cc = 2.7v supply current vs. temperature v cc = 5.5v, c l = 15pf ds1099 toc02 temperature (c) supply current ( a) 60 35 10 -15 100 200 300 400 500 600 700 0 -40 85 out0 = out1 = 1mhz out0 = out1 = 0.25hz out0 =1mhz,out1 = 0.25hz supply current vs. supply voltage c l = 15pf, t a = +25c ds1099 toc01 supply voltage (v) supply current ( a) 4.8 4.1 3.4 100 200 300 400 500 600 700 0 2.7 5.5 out0 = out1 = 1mhz out0 = out1 = 0.25hz out0 =1mhz,out1 = 0.25hz typical operating characteristics ac electrical characteristics ds1099 low-frequency dual econoscillator www.maximintegrated.com maxim integrated 3 downloaded from: http:///
(v cc = +5.0v, t a = +25c, unless otherwise noted.) typical operating characteristics (continued) pin name function 1 out1 oscillator outputs. each output is forced high when the corresponding oe is high. 2 out0 3 v cc positive supply terminal 4 gnd ground 5 oe0 output enable for out0 and out1, respectively. when low, the outputs are enabled. when high, the corresponding output is disabled (forced high). 6 oe1 7, 8 n.c. no connection output voltage high vs. output current ds1099 toc09 i oh (ma) voh (v) -1 -2 -3 -4 2.3 2.4 2.5 2.6 2.7 2.82.2 -5 0 v cc = 2.7v, t a = +25c out0out1 output voltage low vs. output current ds1099 toc08 i ol (ma) voltage (v) 15 10 5 0.1 0.2 0.3 0.4 0.5 0 0 20 v cc = 2.7v, t a = +25c out0out1 frequency change vs. temperature f out = 1mhz, v cc = 4.0v, c l = 15pf ds1099 toc07 temperature ( c) frequency (% change) 60 35 10 -15 -0.5 0 0.5 1.0 -1.0 -40 85 frequency change vs. supply voltage f out = 1mhz, t a = +25 c, c l = 15pf ds1099 toc06 supply voltage (v) frequency (% change) 4.8 4.1 3.4 -0.5 0 0.5 1.0 -1.0 2.7 5.5 duty cycle vs. supply voltage out0 = out1 = 1mhz, c l = 15pf ds1099 toc05 supply voltage (v) duty cycle (% change) 4.8 4.1 3.4 49.0 50.0 51.0 52.048.0 2.7 5.5 t a = -40c t a = +25c t a = +85c supply current vs. voltage oeo = oe1 = v cc ds1099 toc04 supply voltage (v) supply current ( a) 4.8 4.1 3.4 110 120 130 140 150 160 170 180100 2.7 5.5 t a = +25c pin description ds1099 low-frequency dual econoscillator maxim integrated 4 www.maximintegrated.com downloaded from: http:///
detailed description the ds1099 consists of a fixed-frequency 1.048mhz master oscillator followed by two independent facto - ry-programmable dividers. the two divider outputs are connected to pins out0 and out1, which are independently enabled/disabled using the output-enable pins, oe0 and oe1 , respectively. when the output-en - able 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 output- enable pins only disable the corresponding output driver(s) and do not shut down the master oscillator or the dividers. since the master oscillator frequency, f mosc , 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, f out0 and f out1 can be programmed independent of each other. the frequency of the outputs are calculated as follows: f out0 = f mosc /2x0 = 1.048mhz/2 x 0 f out1 = f mosc /2x1 = 1.048mhz/2 x 1 where x 0 is the divider 0 setting and x 1 is the divider 1 setting. valid values for x 0 and x 1 are integers 0 to 22 (dec). table 1 shows output frequencies and divider values for the range of divider settings. table 1. divider settings and output frequencies divider setting x 0 or x 1 divisor f out0 or f out1 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 gnd master oscillator 1.048mhz divider 0 divide by 2 x (x = x 0 = 0...22) divider 1 divide by 2 x (x = x 1 = 0...22) v cc v cc oe1 oe0 out0out1 f out0 f out1 f mosc factory- programmed eeprom output driver output driver ds1099 functional diagram ds1099 low-frequency dual econoscillator www.maximintegrated.com maxim integrated 5 downloaded from: http:///
the divider settings, x 0 and x 1 , are factory pro - grammed. when placing an order for the ds1099, it is required to specify x0 and x 1 . 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 f out period. when oe is brought low, the output is enabled instantaneously. likewise, if the output is dis - abled while outputting the low half of a cycle, the out- put instantaneously is forced high before the current cycle is completed. applications 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 v cc and gnd pins of the ic to minimize lead inductance. a divisor f out a 2 0 1.048mhz b 2 1 0.524mhz c 2 2 0.262mhz d 2 3 0.131mhz e 2 4 65.50khz f 2 5 32.750khz g 2 6 16.375khz h 2 7 8.187khz j 2 8 4.093khz k 2 9 2.046khz l 2 10 1.023khz m 2 11 511.7hz n 2 12 255.8hz p 2 13 127.9hz q 2 14 63.96hz r 2 15 31.98hz s 2 16 16hz t 2 17 8hz u 2 18 4hz w 2 19 2hz x 2 20 1hz y 2 21 0.5hz z 2 22 0.25hz package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. branding information the package branding includes a0 and a1 on the top of the package next to or below 1099. ordering information (continued) chip topology substrate connected to ground ds1099 low-frequency dual econoscillator www.maximintegrated.com maxim integrated 6 downloaded from: http:///
revision number revision date description pages changed 1 9/07 1, 2, 3, 5, 6 2 5/15 remove automotive reference from data sheet 1 revision history maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. ds1099 low-frequency dual econoscillator ? 2015 maxim integrated products, inc. 7 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///
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