for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. 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 requirements. applications flashing led status indicators consumer appliances automotive 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: -40 c to +125 c ? 100ppm/c temp drift (max) ds1099 low-frequency dual econoscillator ________________________________________________________________ maxim integrated products 1 oe1 oeo gnd 1 2 8 7 n.c. n.c. out0 v cc out1 sop top view 3 4 6 5 ds1099 pin configuration ordering information out0 out1 gnd oe0 v cc v cc v cc oe1 n.c. n.c. oe1 can instead be tied to v cc if out1 is not used. outputs capable of sinking 16ma ds1099 typical operating circuit rev 1; 9/07 part temp range pin-package ds1099u- o 1 -40c to +125c 8 sop econoscillator is a trademark of dallas semiconductor. ordering information is continued on the last page. * where 0 and 1 specify the factory programmed divider set- tings for out0 and out1, respectively. for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com.
ds1099 low-frequency dual econoscillator 2 _______________________________________________________________________________________ absolute maximum ratings recommended dc operating conditions (t a = -40? to +125?) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 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 .........................-40 c to +125 c storage temperature range .............................-55 c to +125 c soldering temperature .......................................see ipc/jedec j-std-020a specification 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 (v cc = +2.7v to +5.5v, t a = -40? to +125?, unless otherwise noted.) parameter symbol conditions min typ max units standby supply current i stby oe0 = oe1 = v cc 145 275 a 1.048mhz (both) 323 4khz (both) 146 active supply current (note 2) i cc c l = 15pf per output, oe0 = oe1 = gnd, v cc = 3.3v 1hz (both) 145 a 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
ds1099 low-frequency dual econoscillator _______________________________________________________________________________________ 3 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. ac electrical characteristics (v cc = +2.7v to +5.5v, t a = -40? to +125?, 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 = +25?, v cc = 4.1v -1.0 +1.0 % t a = +25? 3300 ppm/v voltage frequency variation (note 3) f out 2.7v to 5.5v, t a = +25? -2.0 +2.5 % temperature frequency variation f out (notes 3, 4) -100 +100 ppm/? 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 typical operating characteristics (v cc = +5.0v, t a = +25?, unless otherwise noted.) supply current vs. supply voltage c l = 15pf, t a = +25 c 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 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. 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 0 050 v cc = 5.5v v cc = 4.0v v cc = 2.7v
pin description pin name function 1 out1 2 out0 oscillator outputs. each output is forced high when the corresponding oe is high. 3v cc 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 ds1099 low-frequency dual econoscillator 4 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +5.0v, t a = +25?, unless otherwise noted.) supply current vs. voltage oeo = oe1 = v cc ds1099 toc04 supply voltage (v) supply current ( a) 4.8 4.1 3.4 110 120 130 140 150 160 170 180 100 2.7 5.5 t a = +25 c 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 52.0 48.0 2.7 5.5 t a = -40 c t a = +25 c t a = +85 c 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 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 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 0 020 v cc = 2.7v, t a = +25 c out0 out1 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 2.8 2.2 -5 0 v cc = 2.7v, t a = +25 c out0 out1
ds1099 detailed description the ds1099 consists of a fixed-frequency 1.048mhz master oscillator followed by two independent factory- programmable dividers. the two divider outputs are connected to pins out0 and out1, which are inde- pendently enabled/disabled using the output-enable pins, oe0 and oe1 , respectively. when the output- enable 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 / 2 x 0 = 1.048mhz / 2 x 0 f out1 = f mosc / 2 x 1 = 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 inte- gers 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 functional diagram 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 out0 out1 f out0 f out1 f mosc factory- programmed eeprom output driver output driver ds1099 low-frequency dual econoscillator _______________________________________________________________________________________ 5
ds1099 low-frequency dual econoscillator maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it 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. the divider settings, x 0 and x 1 , are factory pro- grammed. when placing an order for the ds1099, it is required to specify x 0 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. 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 0.01? and 0.1?. use a high-quality, ceramic, sur- face-mount capacitor, and mount it as close as possi- ble to the v cc 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 ordering information (continued) divisor f out a2 0 1.048mhz b2 1 0.524mhz c2 2 0.262mhz d2 3 0.131mhz e2 4 65.50khz f2 5 32.750khz g2 6 16.375khz h2 7 8.187khz j2 8 4.093khz k2 9 2.046khz l2 10 1.023khz m2 11 511.7hz n2 12 255.8hz p2 13 127.9hz q2 14 63.96hz r2 15 31.98hz s2 16 16hz t2 17 8hz u2 18 4hz w2 19 2hz x2 20 1hz y2 21 0.5hz z2 22 0.25hz branding information the package branding includes 0 and 1 on the top of the package next to or below 1099.
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