TS3V555 3v low power single timers october 1997 . dedicated to 3.3v or battery supply (specified at 3v and 5v) . very low power consumption : 90 m a at v cc = 3v . wide single supply range : +2.7v to +16v . high output current capability . supply current spikes reduced during output transitions . high input impedance : 10 12 w . pin-to-pin and functionally compat- ible with bipolar ne555 and cmos ts555 . output compatible with ttl,cmos and logic mos n dip8 (plastic pac kage) d so8 (plastic micropac kage) description the TS3V555 with its low consumption (90 m a at v cc = 3v) is a single cmos timer dedicated to 3.3v or battery supply (specified at 3v and 5v) offering also a high frequency (f (max) 2mhz at v cc = 3v and 2.7 mhz at v cc = 5v). thus, either in monostable or astable mode, timing remains very accurate. timing capacitors can also be minimized due to high input impedance (10 12 w ). 1 2 3 4 8 7 6 5 gnd trigger output reset cc control voltage v discharge threshold pin connection s (top view) order codes part number temperature range package nd TS3V555i -40, +125 o c ll 1/8
function table reset trigger threshold output low x x low high low x high high high high low high high low previous state low ? level voltage min voltage specified high ? level voltage 3 max voltage specified x ? irrelevant absolute maximum ratings symbol parameter value unit v cc supply voltage +18 v t j junction temperature +150 o c thermal characteristics symbol parameter value unit t oper operating temperature range TS3V555i,ai -40 to +125 o c t stg storage temperature range -65 to +150 o c output discharge ground trigger control voltage threshold reset 1 6 5 2 8 4 r r r b a r1 r s q + - + - 7 3 3v555 v cc block diagram operating conditions symbol parameter value unit v cc supply voltage +2.7 to +16 v TS3V555 2/8
electrical characteristics v cc = +3v , t amb = +25 o c , reset to v cc (unless otherwise specified) static symbol parameter TS3V555i unit min. typ. max. i cc supply current - (no load, high and low states) t amb = +25 o c t min. t amb t max . 90 230 230 m a v cl control voltage t amb = +25 o c t min. t amb t max . 1.8 1.7 2 2.2 2.3 v v dis discharge saturation voltage (i dis = 1ma) t amb = +25 o c t min. t amb t max . 0.05 - 0.2 0.25 v v ol low level output voltage (i sink = 1ma) t amb = +25 o c t min. t amb t max . 0.1 0.3 0.35 v v oh high level output voltage (i source = -0.3ma) t amb = +25 o c t min. t amb t max . 2.5 2.5 2.9 v v trig trigger voltage t amb = +25 o c t min. t amb t max . 0.9 0.8 1 1.1 1.2 v i trig trigger current 10 pa i th threshold current 10 pa v reset reset voltage t amb = +25c t min . t amb t max. 0.4 0.3 1.1 1.5 2.0 v i reset reset current 10 pa i dis discharge pin leakage current 1 100 na dynamic symbol parameter TS3V555i unit min. typ. max. timing accuracy (monostable) r = 10k w , c = 0.1 m f - (note 1) 1 % timing shift with supply voltage variations (monostable) r = 10k w , c = 0.1 m f, v cc = +3v +/-0.3v - (note 1) 0.5 %/v timing shift with temperature - (note 1) t min . t amb t max . 75 ppm/c fmax maximum astable frequency - (note 2) r a = 470 w , r b = 200 w, c = 200pf 2 mhz astable frequency accuracy - (note 2) r a = r b = 1k w to 100k w , c = 0. 1m f 5 % timing shift with supply voltage variations (astable mode) - (note 2) r a = r b = 10k w , c = 0.1 m f, v cc = +3 to+5v 0.5 %/v t r output rise time (c load = 10pf) 25 ns t f output fall time (c load = 10pf) 20 ns t pd trigger propagation delay 100 ns t rpw minimum reset pulse width (v trig = +3v) 350 ns note : 1. see figure 2 2. see figure 4 TS3V555 3/8
electrical characteristics v cc = +5v , t amb = +25 o c , reset to v cc (unless otherwise specified) static symbol parameter TS3V555i unit min. typ. max. i cc supply current - (no load, high and low states) t amb = +25c t min . t amb t max . 110 250 250 m a v cl control voltage t amb = +25c t min . t amb t max . 2.9 2.8 3.3 3.8 3.9 v v dis discharge saturation voltage (i dis = 10ma) t amb = +25c t min . t amb t max . 0.2 0.3 0.35 v v ol low level output voltage (i sink = 8ma) t amb = +25c t min . t amb t max . 0.3 0.6 0.8 v v oh high level output voltage (i source = -2ma) t amb = +25c t min . t amb t max . 4.4 4.4 4.6 v v trig trigger voltage t amb = +25c t min . t amb t max . 1.36 1.26 1.67 1.96 2.06 v i trig trigger current 10 pa i th threshold current 10 pa v reset reset voltage t amb = +25c t min . t amb t max . 0.4 0.3 1.1 1.5 2.0 v i reset reset current 10 pa i dis discharge pin leakage current 1 100 na dynamic symbol parameter TS3V555i unit min. typ. max. timing accuracy (monostable) - (note1) r = 10k w , c = 0.1 m f - (note 1) 2 % timing shift with supply voltage variations (monostable) - (note1) r = 10k w , c = 0.1 m f, v cc = +5v +/-1v 0.38 %/v timing shift with temperature - (note1) t min . t amb t max . 75 ppm/c fmax maximum astable frequency - (note 2) r a = 470 w , r b = 200 w , c = 200pf 2.7 mhz astable frequency accuracy - (note 2) r a = r b = 1k w to 100 k w , c = 0. 1m f 3 % timing shift with supply voltage variations (astable mode) - (note 2) r a = r b = 10k w , c = 0.1 m f, v cc = +5v to+12v 0.1 %/v t r output rise time (c load = 10pf) 25 ns t f output fall time (c load = 10pf) 20 ns t pd trigger propagation delay 100 ns t rpw minimum reset pulse width (v trig = +5v) 350 ns note : 1. see figure 2 2. see figure 4 TS3V555 4/8
application information monostable operation in the monostable mode,the timer functions as a one-shot. referring to figure 2 the external capaci- tor is initially held discharged by a transistor inside the timer. v cc reset trigger out 3 2 4 8 7 6 5 1 r c control voltage 0.01 f m TS3V555 figure 2 capacitor voltage = 2.0v/div w w m t = 0.1 ms / div input = 2.0v/div output voltage = 5.0v/div r = 9.1k , c = 0.01 f , r = 1.0k l figure 3 typical characteristics cc supply voltage, v (v) cc supply current, i ( a) m 300 200 100 0 4 8 12 16 figure 1 : supply current (each timer) versus supply voltage . the circuit triggers on a negative-going input signal when the level reaches 1/3 v cc . once triggered,the circuit remains in this state until the set time has elapsed,even if it is triggered again during this interval. the duration of the output high state is given by t = 1.1 r x c. notice that since the charge rate and the thres hold level of the comparator are both directly propor- tional to supply voltage, the timing interval is inde- pendent of supply. applying a negative pulse simultaneously to the reset terminal (pin 4) and the trigger terminal (pin 2) during the timing cycle discharges the external capacitor and causes the cycle to start over. the timing cycle now starts on the positive edge of the reset pulse. during the time the reset pulse is applied, the output is driven to its low state. when a negative trigger pulse is applied to pin 2, the flip-flop is set, releasing the short circuit across the external capacitor and driving the output high. the voltage across the capacitor increases expo- nentially with the time constant t = r x c. when the voltage across the capacitor equals 2/3 v cc , the comparator resets the flip-flop which then discharges the capacitor rapidly and drives the output to its low state. figure 3 shows the actual waveforms generated in this mode of operation. when reset is not used, it should be tied high to avoid any possible or false triggering. TS3V555 5/8
v cc reset out 3 4 8 7 5 1 r c 2 6 r a b control voltage 0.01 f m TS3V555 figure 4 w w m t = 0.5 ms / div output voltage = 5.0v/div capacitor voltage = 1.0v/div l r = r = 4.8 k , c = 0.1 f , r = 1.0k ab figure 5 astable operation when the circuit is connected as shown in figure 4 (pin 2 and 6 connected) it triggers itself and free runs as a multivibrator. the external capacitor charges through r a and r b and discharges through r b only. thus the duty cycle may be pre- cisely set by the ratio of these two resistors. in the astable mode of operation, c charges and discharges between 1/3 v cc and 2/3 v cc . as in the triggered mode, the charge and discharge times and therefore frequency, are independent of the supply voltage. figure 5 shows actual waveforms generated in this mode of operation. the charge time (output high) is given by : t1 = 0.693 (r a + r b ) c and the discharge time (output low) by : t2 = 0.693 (r b ) c thus the total period t is given by : t = t1 + t2 = 0.693 (r a + 2r b ) c the frequency of oscillation is then : f = 1 t = 1.44 ( r a + 2r b ) c the duty cycle is given by : d = r b r a + 2 r b TS3V555 6/8
pm-dip8.eps package mechanical data 8 pins - plastic dip dimensions millimeters inches min. typ. max. min. typ. max. a 3.32 0.131 a1 0.51 0.020 b 1.15 1.65 0.045 0.065 b 0.356 0.55 0.014 0.022 b1 0.204 0.304 0.008 0.012 d 10.92 0.430 e 7.95 9.75 0.313 0.384 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 f 6.6 0260 i 5.08 0.200 l 3.18 3.81 0.125 0.150 z 1.52 0.060 dip8.tbl TS3V555 7/8
information furnished is believed to be accurate and rel iable. however, sgs-thomson microelectronics 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 sgs-thomson microelectroni cs. specifications mentioned in this publication are subject to change wi thout notice. this publication supersedes and replaces all information previously supplied. sgs-thomson microelectronics products are not authorized for use as critical components in lif e support devices or systems without express written approval of sgs-thomson microelectronics. ? 1997 sgs-thomson microelectronics C printed in italy C all rights reserved sgs-thomson microelectronics group of companies australia - brazil - canada - china - france - germany - italy - japan - korea - malaysia - malta - morocco the netherlands - singapore - spain - s weden - s witzerland - taiwan - thailand - united kingdom - u.s.a. order code : pm-so8.eps package mechanical data 8 pins - plastic micropackage (so) dimensions millimeters inches min. typ. max. min. typ. max. a 1.75 0.069 a1 0.1 0.25 0.004 0.010 a2 1.65 0.065 a3 0.65 0.85 0.026 0.033 b 0.35 0.48 0.014 0.019 b1 0.19 0.25 0.007 0.010 c 0.25 0.5 0.010 0.020 c1 45 o (typ.) d 4.8 5.0 0.189 0.197 e 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 f 3.8 4.0 0.150 0.157 l 0.4 1.27 0.016 0.050 m 0.6 0.024 s8 o (max.) so8.tbl TS3V555 8/8
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