utc LM556 linear integrated circuit utc unisonic technologies co., ltd. 1 qw-r106-004,a dual timer description the utc LM556 dual monolithic circuit is a highly stable controller capable of producing accurate delays or oscillation. the utc LM556 is the dual of utc ne555; timing is provided an external resistor and capacitor for each function. the two timers operate independently of each other, sharing only vcc and gnd. the circuits may be triggered and reset on falling wave forms. the output structures may sink or source 200ma. features *high current driver capability(=200ma) *adjustable duty cycle *timing from sec to hours *temperature stability of 0.005%/ c *ttl compatible *operates in both astable and monostable modes dip-14 sop-14 applications *precision timing. *pulse width modulation. *pulse generator, shaping. *traffic light control. *time delay generator. *touch tone encoder. *sequential timing. *tone burst generator. block diagram
utc LM556 linear integrated circuit utc unisonic technologies co., ltd. 2 qw-r106-004,a absolute maximum ratings (ta=25 c ) parameter symbol value unit supply voltage vcc 16 v power dissipation pd 600 mw lead temperature(soldering 10 sec.) tlead 300 c operating temperature topr -40~85 c storage temperature tstg -65~150 c electrical characteristics ( ta=25 c ,vcc=5 to 15v, unless otherwise specified ) parameter symbol test conditions min typ max unit supply voltage vcc 4.5 16 v supply current(two timers) icc vcc=5v,rl= 5 12 ma (low state), (note 1) vcc=15v,rl= 16 30 ma timing error(monostable) initial accuracy(note 2) a ccur r a =2k ? to 100k ? c=0.1 f t=1.1rc 0.75 % drift with temperature ? t/ ? t 50 ppm/ c drift with supply voltage ? t/ ? vcc 0.1 %/v timing error(astable) initial accuracy(note 2) a ccur r a =1k ? to 100k ? c=0.1 f vcc=15v 2.25 % drift with temperature ? t/ ? t 150 ppm/ c drift with supply voltage ? t/ ? vcc 0.3 %/v control voltage vc vcc=15v 9.0 10.0 11.0 v vcc=5v 2.6 3.33 4.0 v threshold voltage v th vcc=15v 8.8 10.0 11.2 v vcc=5v 2.4 3.33 4.2 v threshold current(note 3) i th 30 250 na trigger voltage vtr vcc=5v 1.1 1.6 2.2 v vcc=15v 4.5 5 5.6 v trigger current itr vtr=0 0.01 2.0 a reset voltage(note 4) vrst 0.4 0.6 1.0 v reset current irst 0.03 0.6 ma low output voltage v ol vcc=15v isink=10ma isink=50ma isink=100ma isink=200ma 0.1 0.25 v 0.4 0.75 v 2 3.2 v 2.5 v vcc=5v isink=5ma isink=8ma 0.15 0.25 v 0.25 0.35 v
utc LM556 linear integrated circuit utc unisonic technologies co., ltd. 3 qw-r106-004,a parameter symbol test conditions min typ max unit high output voltage v oh vcc=15v isource=200ma isource=100ma 12.5 v 12.75 13.3 v vcc=5v isource=100ma 2.75 3.3 v rise time of output t r 100 300 nsec fall time of output t f 100 300 nsec discharge leakage current i lkg 20 100 na matching parameter initial accuracy(note 5) a ccur r a, r b =1k ? to 100k ? c=0.1 f vcc=15v 1 2 % drift with temperature ? t/ ? t 10 ppm/ c drift with supply voltage ? t/ ? vcc 0.2 0.5 %/v note 1: supply current when output is high is typically 1ma less at vcc 5v. note 2: tested at vcc=5v and vcc=15v. note 3: this will determine the maximum value of ra+rb for 15v operation, the maximum total is r=20m ? , and for 5v operation the maximum total is r=6.6m ? . note 4: as reset voltage lower, timing is inhibited and then the output goes low. note 5: matching parameters refer to the difference between performance parameters of each timer section in the monostable mode. 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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