unisonic technologies co., ltd NE555 linear integrated circuit www.unisonic.com.tw 1 of 8 copyright ? 2010 unisonic technologies co., ltd qw-r106-001,f single timer ? description the utc NE555 is a highly stable timer integrated circuit. it can be operated in both astable and monos table mode. with monostable operation, the time delay is precis ely controlled by one external and one capacitor. with a stable operat ion as an oscillator the frequency and duty cycle are both accurately controlled with two external resistors and one capacitor. ? features *high current driver capability(=200ma). *adjustable duty cycle. *timing from s to hours. *turn off time less than 2 s. *operates in both astable and monostable modes. ? ordering information ordering number normal lead free halogen free package packing NE555-d08-t NE555l-d08-t NE555g-d08-t dip-8 tube NE555-s08-r NE555l-s08-r ne 555g-s08-r sop-8 tape reel NE555-s08-t NE555l-s08-t NE555g-s08-t sop-8 tube
NE555 linear integrated circuit unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r106-001,f ? pin configuration
NE555 linear integrated circuit unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r106-001,f ? block diagram
NE555 linear integrated circuit unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r106-001,f ? absolute maximum ratings parameter symbol ratings unit supply voltage v cc 16 v power dissipation p d 600 mw junction temperature t j +125 operating temperature t opr -20 ~ +85 storage temperature t stg -40 ~ +150 note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (v cc =5 ~ 15v, ta=25 , unless otherwise specified.) parameter symbol test conditions min typ max unit supply voltage v cc 4.5 16 v v cc =5v, r l = 3 6 ma supply current (note 1) i cc v cc =15v, r l = 7.5 15 ma monostable 1.0 3.0 % initial accurary (note 2) astable a ccur r a =1k ~ 100k 2.25 % monostable 50 ppm/ c drift with temperature astable t/ t c=0.1 f 150 ppm/ c monostable 0.1 0.5 %/v drift with supply voltage astable t/ v cc 0.3 %/v v cc =15v 9.0 10.0 11.0 v control voltage v c v cc =5v 2.6 3.33 4.0 v v cc =15v 10.0 v threshold voltage v th v cc =5v 3.33 v threshold current(note 3) i th 0.1 0.25 a v cc =5v 1.1 1.67 2.2 v trigger voltage v tr v cc =15v 4.5 5 5.6 v trigger current i tr v tr =0 0.01 2.0 a reset voltage v rst 0.4 0.7 1.0 v reset current i rst 0.1 0.4 ma v cc =15v i sink =10ma 0.06 0.25 v i sink =50ma 0.3 0.75 v v cc =5v low output voltage v ol i sink =5ma 0.05 0.35 v v cc =15v i source =200ma 12.5 v i source =100ma 12.75 13.3 v high output voltage v oh v cc =5v, i source =100ma 2.75 3.3 v rise time of output t r 100 ns fall time of output t f 100 ns discharge leakage current i lkg 20 100 na note 1: supply current when out put high typically 1ma less at v cc =5v. note 2: tested at v cc =5.0v and v cc =15v. note 3: this will determine the maximum value of r a +r b for 15v operation, the maximum total is r=20m , and for 5v operation the maximum total is r=6.7m .
NE555 linear integrated circuit unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r106-001,f ? typical application circuit 6 2 7 8 4 3 1 5 r2 r1 r3 q1 flip-flop v cc gnd c1 r b r a reset discharge threshold trigger utc NE555 upper comparator lower comparator
NE555 linear integrated circuit unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r106-001,f ? typical application notes the application circuit shows astable mode c onfiguration. pin 6 (threshold ) is tied to pin 2 ( trigger ) and pin 4 ( reset ) is tied to v cc ( pin 8 ). the external capacitor c1 of pin 6 and pin 2 charges through r a , r b and dischages through r b only. in the internal circuit of utc NE555 , one input of the upper comparator is at voltage of 2/3vcc( r1=r2=r3),another input is connected to pin 6.as soon as c1 is charging to higher than 2/3vcc, transistor q1 is turned on and discharge c1 to collector voltage of transistor q1. therefore, the flip-flop circ uit is reset and output is low. one input of lower comparator is at voltage of 1/3vcc, discharge transistor q1 turn off and c1 charges thr ough ra and rb. therefore, t he flip-flop circuit is set output high. that is, when c1 charges through r a and r b , output is high and when c1 discharge through r b ,output is low. the charge time(output is high) t1 is 0.693(r a +r b ) c1 and the discharge time (output is low) t2 is 0.693 r b *c1. ln vcc 1 3 vcc vcc 2 3 vcc 0.693 ? ? ? ? ? ? ? ? ? ? ? ? = t1=0.693*(r a +r b )*c1 thus the total period time t is given by t2=0.693*r b *c1 t=t1+t2=0.693(r a +2r b )*c1. then the frequency of astable mode is given by c1 * ) r (r 1.44 t 1 f b a 2 + = = the duty cycle is given by b a b 2r r r t t2 d.c. + = = .
NE555 linear integrated circuit unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r106-001,f ? typical characteristics supply current,i cc (ma) voltage drop,(v cc -v oh ) (v) t a =125 t a =25 t a =-55 v cc =10v 10 7 4 2 1 0.7 0.4 0.2 0.1 0.07 0.04 0.02 0.01 2 14 7 10 20 40 70 100 low-level output current,i ol (ma) low-level output voltage,v ol (v) low-level output voltage vs low-level output current low-level output voltage vs low-level output current low-level output voltage,v ol (v) low-level output current,i ol (ma) 10 7 4 2 1 0.7 0.4 0.2 0.1 0.07 0.04 0.02 0.01 124 7 10 20 40 70 100 t a =125 t a =-55 t a =25 v cc =5v 100 70 40 20 10 7 4 2 1 0.01 0.02 0.04 0.07 0.2 0.1 0.4 0.7 1 2 4 7 10 low-level output voltage vs low-level output current low-level output voltage,v ol (v) low-level output current,i ol (ma) v cc =15v t a =-55 t a =125 t a =25
NE555 linear integrated circuit unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r106-001,f utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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