1/8 ? TS3V556 n dip14 (plastic package) d so14 . dedicated to 3.3v or battery supply (specified at 3v and 5v) . very low power consumption : 90 a/tim 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 . pin-to-pin and functionally compati- ble with bipolar ne556 and cmos ts556 . output compatible with ttl,cmos and logic mos description the TS3V556 with its low consumption (90 m a/tim at v cc = 3v) is a dual cmos timer dedicated to 3.3v or battery supply (specified at 3v and 5v offer- ing also a high frequency (f (max) 2mhz at v cc =3v and 2.7 mhz at v cc = 5v). thus, either in mono- stable or astable mode, timing remains very accu- rate. timing capacitors can also be minimized due to high input impedance (10 12 w ). order codes part number temperature range package nd TS3V556i -40, +125 o c ll 3v low power dual timers 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 connection s (top view) may 2000
TS3V556 2/8 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 TS3V556i,ai -40 to +125 o c t stg storage temperature range -65 to +150 o c output discharge ground trigger control voltage threshold v cc reset r r r b a r1 r s q + - + - 4 / 10 5 / 9 14 2 / 12 3 / 11 6 / 8 7 1 / 13 3v556 block diagram (1/2 TS3V556) operating conditions symbol parameter value unit v cc supply voltage +2.7 to +16 v
TS3V556 3/8 electrical characteristics v cc = +3v , t amb = +25 o c , reset to v cc (unless otherwise specified) static symbol parameter TS3V556i unit min. typ. max. i cc supply current - (no load, high and low states, per timer) t amb = +25 o c t min. a t amb a t max . 90 230 230 m a v cl control voltage t amb = +25 o c t min. a t amb a 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. a t amb a 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. a t amb a 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. a t amb a t max . 2.5 2.5 2.9 v v trig trigger voltage t amb = +25 o c t min. a t amb a 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 . a t amb a 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 TS3V556i 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 . a t amb a 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
TS3V556 4/8 electrical characteristics v cc = +5v , t amb = +25 o c , reset to v cc (unless otherwise specified) static symbol parameter TS3V556i unit min. typ. max. i cc supply current - (no load, high and low states, per timer) t amb = +25c t min . a t amb a t max . 110 250 250 m a v cl control voltage t amb = +25c t min . a t amb a 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 . a t amb a t max . 0.2 0.3 0.35 v v ol low level output voltage (i sink = 8ma) t amb = +25c t min . a t amb a t max . 0.3 0.6 0.8 v v oh high level output voltage (i source = -2ma) t amb = +25c t min . a t amb a t max . 4.4 4.4 4.6 v v trig trigger voltage t amb = +25c t min . a t amb a 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 . a t amb a 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 TS3V556i 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 .a t amb a 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
TS3V556 5/8 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 r c control voltage 0.01 f m 1/2 TS3V556 figure 2 capacitor voltage = 2.0v/div 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 in- terval. the duration of the output high state is given by t = 1.1 r x c. notice that since the charge rate and the threshold 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 or 10) and the trigger terminal (pin 2 or 8) during the tim- ing 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. dur- ing the time the reset pulse is applied, the output is driven to its low state. when a negative trigger pulse is applied to the trig- ger terminal, the flip-flop is set, releasing the short circuit across the external capacitor and driving the output high. the voltage across the capacitor in- creases exponentially with the time constant t =rx 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 out- put 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.
TS3V556 6/8 v cc reset out r c r a b control voltage 0.01 f m TS3V556 figure 4 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 figur e4,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 precisely set by the ra- tio of these two resistors. in the astable mode of operation, c charges and discharges between 1/3 v cc and 2/3 v cc .asinthe 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 tr r)c b == + 1144 2 . ( a the duty cycle is given by : d r rr = + b ab 2
TS3V556 7/8 package mechanical data 14 pins - plastic dip 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
TS3V556 8/8 nformation furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the conse- quences 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. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously sup- plied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without ex- press written approval of stmicroelectronics. ? the st logo is a trademark of stmicroelectronics ? 2000 stmicroelectronics C printed in italy C all rights reserved stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco singapore - spain - sweden - switzerland - united kingdom - u.s.a. ? http://www.st.com package mechanical data 14 pins - plastic micropackage (so) 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.)
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