technical data IW4541B programmable timer high-performance silicon-gate cmos rev. 00 the IW4541B programmable timer consists of a 16-stage binary counter, an oscillator that is contro lled by external r-c components (2 resistors and a capacitor), an automatic power-on reset circuit, and output control logic. the counter incremen ts on positive-edge clock transitons and can also be reset via the master reset input. the output from this timer is the q or not q output from the 8th, 10th, 13th, or 16th counter stage. the desired stage is chosen using time-select inputs a and b. the output is available in either of two modes selectable via the mode input, pin 10. when this mode input is a logic ?1?,the output will be a continuous square wa ve having a frequency equal to the oscillator frequency divided by 2 n . with the mode input set to logic ?0? and after a master reset is initiated, the output (assuming q output has been selected) changes from a low to a high state after 2 n-1 counts and remains in that state until another master reset pulse is applied or the mode input is set to a logic ?1?. timing is initialized by setting the auto reset input (pin 5) to logic ?0?and turning power on. if pin 5 is set to logic ?1?, the auto reset circuit is disabled and counting will not start untill after a positive master reset pulse is applied and returns to a low level. the auto reset consumes an appreciable amount of power and should not be used if low-power operation is desired. for reliable automatic power-on reset, v cc should be greater than 5v. ordering information IW4541Bn plastic IW4541Bd soic t a = -55 to 125 c for all packages ? operating voltage range: 3.0 to 18 v ? maximum input current of 1 a at 18 v over full package-temperature range; 100 na at 18 v and 25 c ? noise margin (over full p ackage temperature range): 1.0 v min @ 5.0 v supply 2.0 v min @ 10.0 v supply 2.5 v min @ 15.0 v supply pin assignment nc = no connection logic diagram pin 14 =v cc pin 7 = gnd pins 4,11 = no connection
IW4541B rev. 00 maximum ratings * symbol parameter value unit v cc dc supply voltage (referenced to gnd) -0.5 to +20 v v in dc input voltage (referenced to gnd) -0.5 to v cc +0.5 v v out dc output voltage (referenced to gnd) -0.5 to v cc +0.5 v i in dc input current, per pin 10 ma p d power dissipation in still air, plastic dip+ soic package+ 750 500 mw p d power dissipation per output transistor 100 mw tstg storage temperature -65 to +150 c t l lead temperature, 1 mm from case for 10 seconds (plastic dip or soic package) 260 c * maximum ratings are those values beyond which damage to the device may occur. functional operation should be restricted to the reco mmended operating conditions. +derating - plastic dip: - 10 mw/ c from 65 to 125 c soic package: : - 7 mw/ c from 65 to 125 c recommended operating conditions symbol parameter min max unit v cc dc supply voltage (referenced to gnd) 3.0 18 v v in , v out dc input voltage, output voltage (referenced to gnd) 0 v cc v t a operating temperature, all package types -55 +125 c this device contains protection circuitry to guard agains t damage due to high static voltages or electric fields. however, precautions must be taken to avoid applications of any voltage highe r than maximum rated voltages to this high-impedance circuit. for proper operation, v in and v out should be constrained to the range gnd (v in or v out ) v cc . unused inputs must always be tied to an appropriate logic voltage level (e.g., either gnd or v cc ). unused outputs must be left open.
IW4541B rev. 00 dc electrical characteristics digital section v cc guaranteed limit symbol parameter test conditions v -55 c 25 c 125 c unit v ih minimum high-level input voltage v out =0.5v or v cc -0.5v v out =1.0v or v cc -1.0v v out =1.5v or v cc -1.5v 5 10 15 3.5 7 11 3.5 7 11 3.5 7 11 v v il maximum low -level input voltage v out =0.5v or v cc -0.5v v out =1.0v or v cc -1.0v v out =1.5v or v cc -1.5v 5 10 15 1.5 3 4 1.5 3 4 1.5 3 4 v v oh minimum high-level output voltage v in =gnd or v cc 5.0 10 15 4.95 9.95 14.95 4.95 9.95 14.95 4.95 9.95 14.95 v v ol maximum low-level output voltage v in =gnd or v cc 5.0 10 15 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 v i in maximum input leakage current v in = gnd or v cc 18 0.1 0.1 1.0 a i cc maximum quiescent supply current (per package) v in = gnd or v cc 5.0 10 15 20 5 10 20 100 5 10 20 100 150 300 600 3000 a i ol minimum output low (sink) current v in = gnd or v cc u ol =0.4 v u ol =0.5 v u ol =1.5 v 5.0 10 15 1.9 5 12.6 1.55 4 10 1.08 2.8 7.2 ma i oh minimum output high (source) current v in = gnd or v cc u oh =2.5 v u oh =4.6 v u oh =9.5 v u oh =13.5 v 5.0 5.0 10 15 -6.2 -1.9 -5 -12.6 -5 -1.55 -4 -10 -3 -1.08 -2.8 -7.2 ma
IW4541B rev. 00 ac electrical characteristics (c l =50pf, r l =200k , input t r =t f =20 ns) v cc guaranteed limit symbol parameter v -55 c 25 c 125 c unit f max maximum clock frequency (figure 1) 5.0 10 15 1.5 4 6 1.5 4 6 0.75 2 3 mhz t plh , t phl maximum propagation delay, clock to q (figure 1) (2 8 ) 5.0 10 15 10.5 3.8 2.9 10.5 3.8 2.9 21 7.6 5.8 ns (2 16 ) 5.0 10 15 18 10 7.5 18 10 7.5 36 20 15 t thl maximum output transition time, any output (figure 1) 5.0 10 15 200 100 80 200 100 80 400 200 160 ns t tlh maximum output transition time, any output (figure 1) 5.0 10 15 360 180 130 360 180 130 720 360 260 c in maximum input capacitance - 7.5 pf timing requirements (c l =50pf, r l =200k , input t r =t f =20 ns) v cc guaranteed limit symbol parameter +25 c -40 c to +85 c unit t w minimum pulse width, master reset or clock (figure 1) 5 10 15 900 300 225 1800 600 450 ns t r ,t f maximum rise and fall time, clock (figure 1) 5 10 15 unlimited s
IW4541B figure 1. switching weveforms frequency selection table function table rev. 00 expanded logic diagram inputs no. of stages count pin state n a b n 2 0 1 l l 13 8192 5 auto reset on auto reset disable l h 10 1024 6 master reset off master reset on h l 8 256 9 output initially low after reset (q) output initially high after reset (not q) h h 16 65536 10 single transition mode recycle mode
IW4541B n suffix plastic dip (ms - 001aa) symbol min max a 18.67 19.69 b 6.1 7.11 c 5.33 d 0.36 0.56 f 1.14 1.78 g h j 0 10 k 2.92 3.81 notes: l 7.62 8.26 1. dimensions ?a?, ?b? do not include mold flash or protrusions. m 0.2 0.36 maximum mold flas h or protrus ions 0.25 mm (0.010) per s ide. n 0.38 d suffix soic (ms - 012ab) symbol min max a 8.55 8.75 b 3.8 4 c 1.35 1.75 d 0.33 0.51 f 0.4 1.27 g h j 0 8 notes: k 0.1 0.25 1. dimensions a and b do not include mold flash or protrusion. m 0.19 0.25 2. maximum mold flas h or protrus ion 0.15 mm (0.006) per s ide p 5.8 6.2 for a; for b ? 0.25 mm (0.010) per s ide. r 0.25 0.5 dimens ion, mm 1.27 5.27 2.54 7.62 dimens ion, mm a b h c k c m j f m p g d r x 45 seating plane 0.25 (0.010) m t -t- 1 14 7 8 a b f g d l h seating plane n k 0.25 (0.010) m t m j -t- c 1 14 7 8 rev. 00
|
