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NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 1 of 14 www.diodes.com february 2012 ? diodes incorporated new product description these devices are precision timing circuits capable of producing accurate time delays or oscillation. in the time- delay or monostable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. in the astable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor. the threshold and trigger levels normally are two-thirds and one-third, respectively, of v cc . these levels can be altered by use of the control-voltage te rminal. when the trigger input falls below the trigger level, the flip-flop is set, and the output goes high. if the trigger input is above the trigger level and the threshold input is above the th reshold level, the flip-flop is reset and the output is low. the reset (reset) input can override all other inputs and can be used to initiate a new timing cycle. when reset goes low, the flip-flop is reset, and the output goes low. when the output is low, a low- impedance path is provided between discharge (disch) and ground. the output circuit is capable of sinking or sourcing current up to 200ma. operation is specified for supplies of 5v to 15v. with a 5-v supply, output levels are compatible with ttl inputs. features ? timing from microseconds to hours ? astable or monostable operation ? adjustable duty cycle ? ttl compatible output can source or sink up to 200ma ? ?green? molding compound (no br, sb) ? lead free finish/ rohs compliant (note 1) pin assignments notes: 1. eu directive 2002/95/ec (rohs). all applicab le rohs exemptions applied. please visit our website at http://www.diodes.com /products/lead_free.html . (top view) so-8 v cc disch thres cont out trig gnd reset
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 2 of 14 www.diodes.com february 2012 ? diodes incorporated new product pin descriptions pin name pin number description gnd 1 ground trig 2 trigger set 1/3v cc out 3 timer output reset 4 reset active low cont 5 external adjustment of inte rnal threshold and trigger voltages thres 6 threshold set to 2/3 v cc disch 7 low impedance discharge path v cc 8 chip supply voltage functional block diagram reset can override trig, which can override thresh functional table pin name nominal trigger voltage threshold voltage output discharge switch gnd irrelevant irrelevant low on trig <1/3v cc irrelevant high off out <1/3v cc <2/3v cc low on reset <1/3v cc <2/3v cc as previously established
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 3 of 14 www.diodes.com february 2012 ? diodes incorporated new product absolute maximum ratings (note 2) @ t a = 25 c unless otherwise stated symbol parameter rating unit v cc supply voltage (note 3) 18 v v i input voltage cont, r eset, thres, trig v cc v i o output current 225 ma ja package thermal resistance junction-to-ambient (note 4) 130 c/w jc package thermal resist ance junction-to-case (note 5) 15 c/w t j junction temperature 150 c t stg storage temperature -65 to 150 c recommended operating conditions (t a = 25 c) symbol parameter min max unit v cc supply voltage 4.5 16 v v i input voltage cont, r eset, thres, trig v cc v i o output current 200 ma t a operating ambient temperature NE555 0 70 c sa555 -40 85 na555 -40 105 notes: 2. stresses beyond those listed under "absol ute maximum ratings" may cause permanent damag e to the device. these are stress rating s only. functional operation of the device at these or any other conditions beyond those indicated under "recommended operating co nditions" is not implied. exposure to absolu te-maximum-rated conditions for extended periods may affect device reliability. 3. all voltage values are with respect ground. 4. maximum power dissipation is a function of t j (max), ja , and t a . the maximum allowable power dissipation at any allowable ambient temperature is p d = (t j (max) ? t a )/ ja . operating at the absolute maximum t j of 150c can affect reliability. 5. maximum power dissipation is a function of t j (max), jc , and t a . the maximum allowable power dissipation at any allowable ambient temperature is p d = (t j (max) ? t c )/ ja . operating at the absolute maximum t j of 150c can affect reliability. electrical characteristics (v cc = 5v to 15v, t a = 25c unless otherwise stated) symbol parameter test conditions min typ. max unit v th threshold voltage level v cc = 15v 8.8 10 11.2 v v cc = 5v 2.4 3.3 4.2 i th threshold current (note 6) 30 250 na v tr trigger voltage level v cc = 15v 4.5 5 5.6 v v cc = 5v 1.1 1.67 2.2 i tr trigger current trig at 0v 0.5 2 a v rst reset voltage level 0.3 0.7 1 v i rst reset current reset at v cc 0.1 0.4 ma reset at 0v -0.4 -1.5 i dis disch switch off-state current 20 100 na v dis disch saturation voltage with output low (note 7) v cc = 15v, i dis = 15ma 180 480 mv v cc = 5v, i dis = 4.5ma 80 200 v con cont voltage (open circuit) v cc = 15v 9 10 11 v v cc = 5v 2.6 3.3 4
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 4 of 14 www.diodes.com february 2012 ? diodes incorporated new product electrical characteristics (v cc = 5v to 15v, t a = 25c unless otherwise stated) symbol parameter test conditions min typ. max unit v ol low level output voltage v cc = 15v, i ol = 10ma 0.1 0.25 v v cc = 15v, i ol = 50ma 0.4 0.75 v cc = 15v, i ol = 100ma 2 2.5 v cc = 15v, i ol = 200ma 2.5 v cc = 5v, i ol = 5ma 0.1 0.35 v cc = 5v, i ol = 8ma 0.15 0.4 v oh high level output voltage v cc = 15v, i oh = -100ma 12.75 13.3 v v cc = 15v, i oh = -200ma 12.5 v cc = 5v, i oh = -100ma 2.75 3.3 i cc supply current output low, no load v cc = 15v 10 15 ma v cc = 5v 3 6 output high, no load v cc = 15v 9 13 v cc = 5v 2 5 t er initial error of timing interval (note 8) each time, monostable (note 9) 1 3 % each time, astable (note 10) 2.25 t tc temperature coefficient of timing interval each time, monostable (note 9) t a = full range 50 ppm/c each time, astable (note 10) 150 t vcc supply voltage sensitivity of timing interval each time, monostable (note 9) 0.1 0.5 %/v each time, astable (note 10) 0.3 t ri output pulse rise time c l = 15pf 100 300 ns t fa output pulse fall time c l = 15pf 100 300 ns notes: 6. this parameter influences the maximum value of the timing resistors r a and r b in the circuit of figure 12. for example, when v cc = 5 v, the maximum value is r = r a + r b ? 3.4m ? , and for v cc = 15 v, the maximum value is 10m ? . 7. no protection against excessive pin 7 current is nec essary providing package dissipation rating is not exceeded 8. timing interval error is defined as the difference between the measured value and the average value of a random sample from each process run. 9. values specified are for a device in a monostable circui t similar to figure 9, with th e following component values: r a = 2k ? to 100k ? , c = 0.1uf. 10. values specified are for a device in an astable circuit similar to figure 12, with th e following component values: r a = 1k ? to 100k ? , c = 0.1uf.
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 5 of 14 www.diodes.com february 2012 ? diodes incorporated new product typical performance characteristics 12 7 70100 402010 4 i - low level output current (ma) low level output voltage vs. low level output current @ v = 5v ol cc 0.1 0.04 0.01 v - l o w - l e v e l o ut p ut v o lta g e (v) ol 0.02 0.07 1 0.4 0.2 0.7 10 4 2 7 t = 105c a t = 25c a t = -40c a v = 5v cc 12 7 70100 402010 4 i - low level output current (ma) low level output voltage vs. low level output current @ v = 10v ol cc 0.1 0.04 0.01 v - l o w - level o u t p u t v o l t a g e (v) ol 0.02 0.07 1 0.4 0.2 0.7 10 4 2 7 t = 105c a t = 25c a t = -40c a v = 10v cc 12 7 70100 402010 4 i - low level output current (ma) low level output voltage vs. low level output current @ v = 15v ol cc 0.1 0.04 0.01 v - l o w - level o u t p u t v o l t a g e (v) ol 0.02 0.07 1 0.4 0.2 0.7 10 4 2 7 t = 105c a t = 25c a t = -40c a v = 15v cc i - high level output current (ma) drop between supply voltage and output vs. high level output current oh 12 7 70100 402010 4 0.4 0 (v - v ) v o l t a g e d r o p (v) cc oh t = -40c a 0.2 0.6 1.4 0.8 1.2 2 1.8 1.6 1 v = 5v to 15v cc t = 25c a t = 105c a
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 6 of 14 www.diodes.com february 2012 ? diodes incorporated new product typical performance characteristics (cont.) i - supply current (ma) cc 5 6 7 9 14 15 1312 11 10 8 14 12 10 8 6 4 0 2 v - supply voltage (v) supply current vs. supply voltage cc t = -40c a output low, no load t = 25 a c t = 105 a c 0 0.05 0.15 0.35 0.4 0.30.250.2 0.1 lowest level of trigger pulse -xv propagation delay time vs. lowest voltage level of trigger pulse cc 1000 800 700 500 300 0 t - propagation delay time (ns) pd 900 600 400 100 200 pulse duration relative to value @ v = 10v cc 0.985 02 0 15 10 5 v - supply voltage (v) normalized output pulse duration (monostable mode) vs. supply voltage cc 0.99 0.995 1 1.005 1.01 1.015 -75 -50 0 100 125 755025 -25 t - free air temperature (c) normalized output pulse duration (monostable mode) vs. free-air temperature a 1.015 1.01 1.005 1 0.995 0.99 0.0985 p u lse d u r a t i o n r ela t ive to val u e @ t = 25c a
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 7 of 14 www.diodes.com february 2012 ? diodes incorporated new product typical applications characteristics monostable operation for monostable operation, any of t he ?555 timers can be connected as shown in figur e 1. if the output is low, application of a negative-going pulse to the trigger (trig) sets the internal flip-flop and drives the output hi gh. capacitor c is then charged through r a until the voltage across the capacitor reaches the thresh old voltage of the threshold (thres) input. if trig has returned to a high level, the output of the threshold comparator resets the internal flip-flop, drives the output low, and discharges c. fig 1. monostable operation monostable operation is initiated when trig voltage falls below the trigger threshold. once init iated, the sequence ends only if trig is high for at least 10 s before the end of the timing interval. when the trigger is grounded, the comparator storage time can be as long as 10 s, which limits the minimum monostable pulse width to 10 s. because of the threshold level and saturation voltage of q1, the output pulse duration is approximately t w = 1.1r a c. figure 3 is a plot of the time constant for various values of r a and c. the threshold levels and charge rates both are directly proportional to the supply voltage, v cc . the timing interval is, therefore, independe nt of the supply volt age, so long as the supply volt age is constant during the time interval. applying a negative-going trigger pulse simultaneously to r eset and trig during the timing interval discharges c and reinitiates the cycle, commencing on the positive edge of the reset pulse. the output is held low as long as the reset pulse is low. to prevent false triggering, when reset is not used, it should be connected to v cc . fig. 2 typical monostable waveforms fig. 3 output pulse duration vs. capacitance r l r a thres trig disch reset cont v cc gnd out output 4 7 6 2 1 3 8 5 v cc (5v to 15v) input c
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 8 of 14 www.diodes.com february 2012 ? diodes incorporated new product typical applications characteristics (cont.) astable operation as shown in figure 4, adding a second resistor, r b , to the circuit of figure 1 and connec ting the trigger input to the threshold input causes the timer to self-trigger and run as a multivibrator. the capacitor c charges through r a and r b and then discharges through r b . therefore, the duty cycle is controlled by the values of r a and r b . this astable connection results in capacitor c charging and discharging between the threshold-voltage level ( ? 0.67v cc ) and the trigger-voltage level ( ? 0.33v cc ). as in the monostable circuit, charge and di scharge times (and, t herefore, the frequency and duty cycle) are independent of the supply voltage. ? c r l r a r b thres trig disch reset cont v cc gnd out output 4 7 6 2 1 3 8 5 open (see note a) v cc (5v to 15v) decoupling cont voltage to ground with a capacitor can improve operation. this should be evaluated for individual applications. 0.01f fig. 4 circuit for astable operation fig. 5 typical astable waveforms figure 5 shows typical waveforms generated during ast able operation. the output high-level duration t h and low-level duration t l can be calculated as follows: t h = 0.693(r a +r b )c t l = 0.693(r b )c other useful equations are: period = t h + t l = 0.693(r a + 2r b )c frequency = 1.44/(r a + 2r b )c output driver duty cycle = t l /(t h + t l ) = r b /(r a + 2r b ) output waveform duty cycle = t h /(t h + t l ) = 1 ? r b /(r a + 2r b ) low to high ratio = t l /t h = r b /(r a + r b ) fig. 6 free running frequency
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 9 of 14 www.diodes.com february 2012 ? diodes incorporated new product typical applications characteristics (cont.) missing pulse detector the circuit shown in figure 7 can be used to detect a missing pulse or abnormally long spacing between consecutive pulses in a train of pulses. the timing interval of the monostable circuit is retriggered continuously by the input pulse train as lon g as the pulse spacing is less than the timing interval. a longer pulse spacing, missing pulse, or terminated pulse train permits th e timing interval to be completed, thereby generating an output pulse as shown in figure 8. ? fig. 7 circuit for missing pulse dectector fig. 8 timing waveforms for missing pulse dectector frequency divider by adjusting the length of the timing cycle, the basic circuit of figure 1 can be ma de to operate as a frequency divider. figur e 9 shows a divide-by-three circuit that makes use of the fact that retriggering cannot occur during the timing cycle. fig. 9 divide by three circuit waveforms
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 10 of 14 www.diodes.com february 2012 ? diodes incorporated new product typical applications characteristics (cont.) pulse width modulation the operation of the timer can be modified by modulating the internal threshold and trigger voltages, which is accomplished by applying an external voltage (or current) to cont. figur e 10 shows a circuit for pulse-width modulation. a continuous input pulse train triggers the monostable circuit, and a control signal modulates the threshold voltage. figure 11 shows the resulting output pulse-width modulation. while a sine-wave modu lation signal is shown, any wave shape could be used. fig 10. circuit for pulse width modulation fig 11. pulse width modulation timing diagrams pulse position modulation as shown in figure 12, any of these ti mers can be used as a pulse-position modu lator. this application modulates the threshold voltage and, thereby, the time delay, of a free-running oscillator. figure 13 shows a triangular-wave modulation signal for such a circuit; however, any wave shape could be used. ? fig 12. circuit for pulse position modulation fig 13. pulse position modulation timing diagrams
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 11 of 14 www.diodes.com february 2012 ? diodes incorporated new product typical applications characteristics (cont.) sequential timer many applications, such as computers, require signals for init ializing conditions during start-up. other applications, such as test equipment, require activation of test signals in sequenc e. these timing circuits can be connected to provide such sequential control. the timers can be used in various combin ations of astable or monostable circuit connections, with or without modulation, for extremely flexible waveform control. fi gure 14 shows a sequencer circuit with possible applications in many systems, and figure 15 shows the output waveforms. fig 14. circuit for sequential timer fig 15. sequential timer waveforms
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 12 of 14 www.diodes.com february 2012 ? diodes incorporated new product ordering information device operating temperature package code packaging (note 10) 13? tape and reel quantity part number suffix NE555s-13 0 to 70c s so-8 2500/tape & reel -13 sa555s-13 -40 to 85c s so-8 2500/tape & reel -13 na555s-13 -40 to 105c s so-8 2500/tape & reel -13 notes: 10. pad layout as shown on diodes inc. suggested pad la yout document ap02001, which can be found on our website at http://www.di odes.com/datashe ets/ap02001.pdf. marking information so-8 package packing s : so-8 : 13 : tape & reel xxxxx x -x device NE555 sa555 na555 package packing s : so-8 : 13 : tape & reel xxxxx x -x device NE555 sa555 na555
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 13 of 14 www.diodes.com february 2012 ? diodes incorporated new product package outline dimensions (all dimensions in mm) so-8 suggested pad layout so-8 so-8 dim min max a - 1.75 a1 0.10 0.20 a2 1.30 1.50 a3 0.15 0.25 b 0.3 0.5 d 4.85 4.95 e 5.90 6.10 e1 3.85 3.95 e 1.27 typ h - 0.35 l 0.62 0.82 0 8 all dimensions in mm dimensions value (in mm) x 0.60 y 1.55 c1 5.4 c2 1.27 gauge plane seating plane detail ?a? detail ?a? e e1 h l d e b a2 a1 a 45 7 ~ 9 a3 0.254 x c1 c2 y
NE555/sa555/na555 precision timers NE555/sa555/na555 document number: ds35112 rev. 4 - 2 14 of 14 www.diodes.com february 2012 ? diodes incorporated new product important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life support devices or systems. copyright ? 2012, diodes incorporated www.diodes.com

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