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ts555c,i,m low power single cmos timers january 1999 . very low power consumption : . 100 m a typ at v cc = 5v . high maximum astable frequency 2.7mhz . pin-to-pin and functionally compatible with bipolar ne555 . voltage range : +2v to +18v . high output current capability . supply current spikes reduced during output transitions . high input impedance : 10 12 w . output compatible with ttl,cmos and logic mos n dip8 (plastic package) d so8 (plastic micropackage) 1 2 3 4 8 7 6 5 gnd trigger output reset cc control voltage v discharge threshold pin connections (top view) order codes part number temperature range package ndp ts555c 0 o c, +70 o c lll ts555i -40, +125 o c lll ts555m -55, +125 o c lll examples : ts555cd , ts555in ? description the ts555 is a single cmos timer which offers very low consumption (icc (typ) ts555 = 100 m a icc (typ) ne555 = 3ma) and high frequency (f (max.) ts555 = 2.7mhz - f (max.) ne555 = 0.1 mhz) thus, either in monostable or astable mode, timing remains very accurate. the ts555 provides reduced supply current spikes during output transitions, which enables the use of lower decoupling capacitors compared to those required by bipolar ne555. timing capacitors can also be minimized due to high input impedance (10 12 w ). p tssop8 (thin shrink small outline package) 1/12
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 ts555c ts555i ts555m 0 to +70 -40 to +125 -55 to +125 o c t stg storage temperature range -65 to +150 o c output discharge ground trigger control voltage threshold v cc reset 1 6 5 2 8 4 r r r b a r1 r s q + - + - 7 3 ts555 block diagram ts555c,i,m 2/12
r1 50k w t1 r2 50k w r3 50k w r4 50k w r5 50k w r6 50k w t2 t4 threshold t5 t6 t7 t14 t8 t9 t15 t16 t17 t18 t19 trigger t24 t22 t23 t28 t29 t32 t35 t33 discharge output t10 t11 t12 t13 t20 t21 t26 t25 t27 t30 t31 t34 gnd reset v cc r7 control voltage schematic diagram ts555c,i,m 3/12
static electrical characteristics v cc = +2v, t amb = +25 o c, reset to v cc (unless otherwise specified) symbol parameter ts555c-ts555i-ts555m 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 . 65 200 200 m a v cl control voltage t amb = + 25 o c t min . t amb t max . 1.2 1.1 1.3 1.4 1.5 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 . 1.5 1.5 1.9 v v trig trigger voltage t amb = + 25 o c t min . t amb t max . 0.4 0.3 0.67 0.95 1.05 v i trig trigger current 10 pa i th threshold current 10 pa v reset reset voltage t amb = + 25 o c 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 operating conditions symbol parameter value unit v cc supply voltage +2 to +16 v ts555c,i,m 4/12
static electrical characteristics (continued) v cc = +5v, t amb = +25 o c, reset to v cc (unless otherwise specified) symbol parameter ts555c-ts555i-ts555m 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 . 110 250 250 m a v cl control voltage t amb = + 25 o c 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 = + 25 o c t min . t amb t max . 0.2 0.3 0.35 v v ol low level output voltage (i sink = 8ma) t amb = + 25 o c t min . t amb t max . 0.3 0.6 0.8 v v oh high level output voltage (i source = -2ma) t amb = + 25 o c t min . t amb t max . 4.4 4.4 4.6 v v trig trigger voltage t amb = + 25 o c 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 = + 25 o c 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 ts555c,i,m 5/12
static electrical characteristics (continued) v cc = +12v, t amb = +25 o c, reset to v cc (unless otherwise specified) symbol parameter ts555c-ts555i-ts555m 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 . 170 400 400 m a v cl control voltage t amb = + 25 o c t min . t amb t max . 7.4 7.3 8 8.6 8.7 v v dis discharge saturation voltage (i dis = 80ma) t amb = + 25 o c t min . t amb t max . 0.09 1.6 2.0 v v ol low level output voltage (i sink = 50ma) t amb = + 25 o c t min . t amb t max . 1.2 2 2.8 v v oh high level output voltage (i source = -10ma) t amb = + 25 o c t min . t amb t max . 10.5 10.5 11 v v trig trigger voltage t amb = + 25 o c t min . t amb t max . 3.2 3.1 4 4.8 4.9 v i trig trigger current 10 pa i th threshold current 10 pa v reset reset voltage t amb = + 25 o c 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 ts555c,i,m 6/12
dynamic electrical characteristics t amb = +25 o c, reset to v cc (unless otherwise specified) symbol parameter ts555c-ts555i-ts555m unit min typ max timing accuracy (monostable) - (note 1) r = 10k w , c = 0.1 m f v cc = + 2v v cc = + 5v v cc = +12v 1 2 4 % timing shift with supply voltage variations (monostable) r = 10k w , c = 0.1 m f, v cc = + 5v +/-1v 0.38 %/v timing shift with temperature t min. t amb t max. , v cc = + 5v 75 ppm/c f max maximum astable frequency r a = 470 w , r b = 200 w, c = 200pf , v cc = + 5v 2.7 mhz astable frequency accuracy - (note 2) r a = r b = 1k w to 100 k w , c = 0. 1m f v cc = + 5v v cc = + 12v 3 3 % timing shift with supply voltage variations (astable mode) r a = r b = 1k w to 100 k w , c = 0.1 m f, v cc = 5 to+ 12v 0.1 %/v t r output rise time (v cc = + 5v , c load = 10pf) 25 ns t f output fall time (v cc = + 5v , c load = 10pf) 20 - ns t pd trigger propagation delay (v cc = + 5v) 100 ns t rpw minimum reset pulse width (v trig = + 5v) 350 ns notes : 1. see figure 2 2. see figure 4 ts555c,i,m 7/12
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 ts555 r c control voltage 0.01 f m figure 2 cc supply voltage, v (v) cc supply current, i ( a) m 300 200 100 0 4 8 12 16 typical characteristics 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. 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 ts555c,i,m 8/12
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 + 2 r b ) c the duty cycle is given by : d = r b r a + 2 r b v cc reset out 3 4 8 7 5 1 ts555 r c 2 6 r a b control voltage 0.01 f m 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 ts555c,i,m 9/12
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 ts555c,i,m 10/12
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.) ts555c,i,m 11/12
package mechanical data 8 pins - thin shrink small outline package dim. millimeters inches min. typ. max. min. typ. max. a 1.20 0.05 a1 0.05 0.15 0.01 0.006 a2 0.80 1.00 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.15 c 0.09 0.20 0.003 0.012 d 2.90 3.00 3.10 0.114 0.118 0.122 e 6.40 0.252 e1 4.30 4.40 4.50 0.169 0.173 0.177 e 0.65 0.025 k0 o 8 o 0 o 8 o l 0.50 0.60 0.75 0.09 0.0236 0.030 information furnished is believed to be accurate and reliable. however, stmi croelectronics 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 f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specificati ons mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmi croelectronics products are not authorized for use as critical comp onents in life support devices or systems without express written approval of stmi croelectronics. ? the st logo is a trademark of stmicroelectronics ? 1999 stmicroelectronics C printed in italy C all rights reserved stmi croelectronics group of companies australia - brazil - c anada - china - france - germany - i taly - japan - korea - malay sia - malta - mexico - morocco the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. ? http://www.st.com ts555c,i,m 12/12

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