july 1998 ? . low turn off time . maximum operating frequency greater than 500khz . timing from microseconds to hours . operates in both astable and monostable modes . high output current can source or sink 200ma . adjustable duty cycle . ttl compatible . temperature stability of 0.005% per o c order codes part number temperature range pakcage nd ne556 0 o c, 70 o c sa556 C40 o c, 105 o c se556 C55 o c, 125 o c description the ne556 dual monolithic timing circuit is a highly stable controller capable of producing accurate time delays or oscillation. in the time delay mode of op- eration, the time is precisely controlled by one exter- nal resistor and capacitor. for a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two exter- nal resistors and one capacitor. the circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200ma. general purpose dual bipolar timers n dip14 (plastic package) d so14 (plastic micropackage) trigger output control voltage 4 8 5 6 7 9 10 11 12 13 14 trigger threshold discharge reset output discharge gnd 1 2 3 threshold control voltage reset cc v pin connections (top view) ne556 sa556 - se556 1/9
absolute maximum ratings symbol parameter value unit v cc supply voltage 18 v t oper operating free air temperature range for ne556 for sa556 for se556 0 to 70 C40 to 105 C55 to 125 c t j junction temperature 150 c t stg storage temperature range C 65 to 150 c threshold comp 5k w 5k w 5k w trigger r flip-flop s q discharge out inhibit/ reset reset comp s + control voltage v cc 1/2 ne556 block diagram output control voltage threshold comparator v cc r1 4.7k w r2 830 w q5 q6 q7 q8 q9 r3 4.7k w r4 1k w r8 5k w q1 q2 q3 q4 q10 q11 q12 q13 threshold trigger reset discharge g n d 2 4 7 1 q14 q15 r5 10k w r6 100k w r7 100k w r10 5k w q17 q16 q18 r9 5k w d2 r16 100 w r15 4.7k w r14 220 w q24 q23 r17 4.7k w 3 q22 r13 d1 q19 q20 q21 r12 6.8k w 5 trigger comparator flip flop r11 5k w 3.9k w schematic diagram ne556/sa556/se556 2/9
notes : 1. supply current when output is high is typically 1ma less. 2. tested at v cc = +5v and v cc = +15v. 3. this will determine the maximum value of r a + r b for +15v operation the max total is r = 20m w and for 5v operation the max total r = 3.5m w . 4. specified with t rigger input high. electrical characteristics t amb = +25 o c, v cc = +5v to +15v (unless otherwise specified) symbol parameter se556 ne556 - sa556 unit min. typ. max. min. typ. max. i cc supply current (r l ) (- note 1) - (2 timers) low state v cc = +5v v cc = +15v high state v cc = 5v 6 20 4 10 24 6 20 4 12 30 ma timing error (monostable) (r a = 2k to 100k w , c = 0.1 m f) initial accuracy - (note 2) drift with temperature drift with supply voltage 0.5 30 0.05 2 100 0.2 1 50 0.1 3 0.5 % ppm/ c %/v timing error (astable) (r a , r b = 1k w to 100k w , c = 0.1 m f, v cc = +15v) initial accuracy - (note 2) drift with temperature drift with supply voltage 1.5 90 0.15 2.25 150 0.3 % ppm/ c %/v v cl control voltage level v cc = +15v v cc = +5v 9.6 2.9 10 3.33 10.4 3.8 9 2.6 10 3.33 11 4 v v th threshold voltage v cc = +15v v cc = +5v 9.4 2.7 10 3.33 10.6 4 8.8 2.4 10 3.33 11.2 4.2 v i th threshold current - (note 3) 0.1 0.25 0.1 0.25 m a v trig trigger voltage v cc = +15v v cc = +5v 4.8 1.45 5 1.67 5.2 1.9 4.5 1.1 5 1.67 5.6 2.2 v i trig trigger current (v trig = 0v) 0.5 0.9 0.5 2.0 m a v reset reset voltage - (note 4) 0.4 0.7 1 0.4 0.7 1 v i reset reset current v reset = +0.4v v reset = 0v 0.1 0.4 0.4 1 0.1 0.4 0.4 1.5 ma v ol low level output voltage v cc = +15v, i o(sink) = 10ma i o(sink) = 50ma i o(sink) = 100ma i o(sink) = 200ma v cc = +5v, i o(sink) = 8ma i o(sink) = 5ma 0.1 0.4 2 2.5 0.1 0.05 0.15 0.5 2.2 0.25 0.2 0.1 0.4 2 2.5 0.3 0.25 0.25 0.75 2.5 0.4 0.35 v v oh high level output voltage v cc = +15v, i o(source) = 200ma i o(source) = 100ma v cc = +5v, i o(source) = 100ma 13 3 12.5 13.3 3.3 12.75 2.75 12.5 13.3 3.3 v operating conditions symbol parameter se556 ne556 - sa556 unit v cc supply voltage 4.5 to 18 4.5 to 18 v v th , v trig , v cl , v reset maximum input voltage v cc v cc v ne556/sa556/se556 3/9
notes : 5. no protection against excessive pin 7 current is necessary, providing the package dissipation rating will not be exceeded. 6. time mesaured from a positive going input pulse from 0 to 0.8x v cc into the threshold to the drop from high to low of the output trigger is tied to treshold. electrical characteristics (continued) symbol parameter se556 ne556 - sa556 unit min. typ. max. min. typ. max. i dis(off) discharge pin leakage current (output high) (v dis = 10v) 20 100 20 100 na v dis(sat) discharge pin saturation voltage (output low) - (note 5) v cc = +15v, i dis = 15ma v cc = +5v, i dis = 4.5ma 180 80 480 200 180 80 480 200 mv t r t f output rise time output fall time 100 100 200 200 100 100 300 300 ns t off turn off time - (note 6) (v reset = v cc ) 0.5 0.5 m s figure 1 : minimum pulse width required for trigering figure 2 : supply current versus supply voltage figure 3 : delay time versus temperature figure 4 : low output voltage versus output sink current ne556/sa556/se556 4/9
figure 5 : low output voltage versus output sink current figure 6 : low output voltage versus output sink current figure 7 : high output voltage drop versus output figure 8 : delay time versus supply voltage figure 9 : propagation delay versus voltage level of trigger value ne556/sa556/se556 5/9
t 1 = 0.693 r a .c t 2 = [ ( r a r b ) ( r a + r b ) ] cln ? r b - 2r a 2r b - r a ? f = 1 t 1 + t 2 r b < 1 2 r a ti t2 t1 output r c 1/2 ne556 se556 6 4 5 7 3 2 1 14 a (8) (10) (9) (11) (12) v cc 51k w (13) 22k w r s 0.01nf 50% duty cycle oscillator output r c 1/2 ne556 se556 6 4 5 7 3 2 1 14 a (8) (10) (9) (11) (12) v cc (13) trigger modulation input pulse width modulator typical application ne556/sa556/se556 6/9
t2 t1 r a r b output reset output control f = 1.44 r + 2r ) c b a ground ground 0.01 m f c2 control trigger threshold 1/2 ne556 se556 +15v discharge 11 12 8 13 14 9 5 3 10 0.01 m f ground 1/2 ne556 se556 trigger threshold c1 discharge trigger reset vcc 4 14 6 1 2 r t t = 1.1 r .c1 t tone burst generator for a tone burst generator the first timer is used as a monostable and determines the tone duration when triggered by a positive pulse at pin 6. the second timer is enabled by the high output os the monostable. it is connected as an astable and determines the frequency of the tone. output r 1/2 ne556 se556 a (10) (9) (11) (12) v cc (13) r l r l 7 5 2 1 4 14 3 6 (8) r b c operating frequency 0.01nf f = 1.44 r + 2r ) c b a astable operation output r 1/2 ne556 se556 a (10) (8) (11) (12) v cc (13) r l r l 7 6 2 1 4 14 3 c 10nf (9) 5 trigger t = 1.1 r .c a monostable operation t 1 = 0.693 (r a + r b ) c output high t 2 = 0.693 r b c output low ne556/sa556/se556 7/9
dimensions millimeters inches min. typ. max. min. typ. max. a1 0.51 0.020 b 1.39 1.65 0.055 0.065 b 0.5 0.020 b1 0.25 0.010 d 20 0.787 e 8.5 0.335 e 2.54 0.100 e3 15.24 0.600 f 7.1 0.280 i 5.1 0.201 l 3.3 0.130 z 1.27 2.54 0.050 0.100 package mechanical data 14 pins - plastic dip ne556/sa556/se556 8/9
dimensions millimeters inches min. typ. max. min. typ. max. a 1.75 0.069 a1 0.1 0.2 0.004 0.008 a2 1.6 0.063 b 0.35 0.46 0.014 0.018 b1 0.19 0.25 0.007 0.010 c 0.5 0.020 c1 45 o (typ.) d 8.55 8.75 0.336 0.334 e 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 7.62 0.300 f 3.8 4.0 0.150 0.157 g 4.6 5.3 0.181 0.208 l 0.5 1.27 0.020 0.050 m 0.68 0.027 s8 o (max.) information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specif i- cations mentioned in this publication are subject to change without notice. this publication supersedes and replaces all infor- mation previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. ? the st logo is a trademark of stmi croelectronics ? 1998 stmi croelectronics C printed in italy C all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - france - germany - italy - japan - korea - malaysia - malta - mexico - morocco the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. package mechanical data 14 pins - plastic micropackage (so) ne556/sa556/se556 9/9
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