1 standard ics dual monostable multivibrator bu4528B / bu4528Bf the bu4528B and bu4528Bf are monostable multivibrators with trigger and reset functions that can be activated. each chip has two built-in circuits. triggers can initiate both rising and falling in response to input a and input b. as the output monostable pulse width is determined by the time constant of the external resistance (rx) and the capacitor (cx), a wide range of output pulse widths can be set. setting the reset input to "l" enables external asynchronous resetting and this reset input can be utilized to reduce the time from the trigger disable input or the power on until the bu4528B and bu4528Bf are ready for mono- stable operation. features 1) low power dissipation. 2) wide range of operating power supply voltages. 3) high input impedance. 4) high fan-out. 5) direct drive of 2 l-ttl inputs and 1 ls-ttl input. block diagram truth table reset 1 1 t 11 v dd t 12 t 22 reset 2 a 2 b 2 q 2 t 21 a 1 b 1 q 1 v ss 16 15 14 13 12 11 10 9 2 3 4 5 6 7 8 q 1 q 2 input output reset a b q q h h h l h l not triggered h h not triggered h l, h, h not triggered hl l, h, not triggered lxxlh x x not triggered logic circuit diagram b a q q c x r x v dd t 2 t 1 reset
2 standard ics bu4528B / bu4528Bf absolute maximum ratings (ta = 25?, v ss = 0v) parameter symbol limits unit power supply voltage power dissipation operating temperature storage temperature input voltage v dd v mw topr c tstg c v in ? 0.3 ~ v dd + 0.3 v pd ? 0.3 ~ + 18 ? 40 ~ + 85 ? 55 ~ + 150 1000 ( dip ), 500 ( sop ) parameter symbol min. typ. max. unit conditions v dd ( v ) input high level voltage input low level voltage input high level current input low level current output high level voltage output low level voltage output high level current output low level current static current dissipation v ih 3.5 v 5 7.0 10 11.0 15 v il 1.5 v 5 3.0 10 4.0 15 i ih 0.3 m a15v ih = 15v i il ? 0.3 m a15v il = 0v v oh 4.95 v 5 i o = 0ma 9.95 10 14.95 15 v ol 0.05 v 5 i o = 0ma 0.05 10 0.05 15 i oh ? 0.16 ma 5v oh = 4.6v ? 0.4 10 v oh = 9.5v ? 1.2 15 v oh = 13.5v i ol 0.44 ma 5v ol = 0.4v 1.1 10 v ol = 0.5v 3.0 15 v ol = 1.5v i dd 20 m a 5 v i = v dd or gnd 40 10 80 15 electrical characteristics dc characteristics (unless otherwise noted, ta = 25?, v ss = 0v)
3 standard ics bu4528B / bu4528Bf parameter symbol min. typ. max. unit conditions v dd ( v ) t tlh 100 ns 5 50 ns 10 40 ns 15 t thl 100 ns 5 50 ns 10 40 ns 15 t plh t phl 325 ns 5 120 ns 10 90 ns 15 t plh t phl 705 ns 5 290 ns 10 210 ns 15 t plh t phl 325 ns 5 90 ns 10 60 ns 15 1000 ns 5 300 ns 10 250 ns 15 t win 70 ns 5 30 ns 10 30 ns 15 t wout1 550 ns 5 350 ns 10 300 ns 15 t wout2 25 40 55 m s5 10 50 90 m s10 15 55 95 m s15 t rr 0 ns 5 0 ns 10 0 ns 15 c in 5 pf c x = 15pf, r x = 5k w c x = 1000pf, r x = 10k w c x = 15pf, r x = 5k w c x = 1000pf, r x = 10k w c x = 1000pf, r x = 10k w c x = 15pf, r x = 5k w c x = 1000pf, r x = 10k w c x = 15pf, r x = 5k w c x = 15pf, r x = 5k w c x = 1000pf, r x = 10k w output rise time output fall time propagation delay time, a or b to q or q propagation delay time, a or b to q or q propagation delay, reset to q or q minimum input pulse width output pulse width output pulse width minimum trigger time input capacitance switching characteristics (ta = 25?, c l = 50pf, v ss = 0v)
4 standard ics bu4528B / bu4528Bf p.g. p.g. p.g. c x c l c l r x v dd reset a b q q v dd t 2 t 1 fig. 1 switching time measurement circuit v ss measurement circuits a b reset q q 50% 90% 50% 10% 20ns 20ns 50% 50% 50% 50% 50% 50% 50% 20ns 20ns t rr 90% 10% 90% 50% 10% 20ns 20ns t plh t phl t phl t wout t plh t f t r t r t phl t f t phl 90% 90% 10% 50% 10% 90% 50% t wout 10% fig. 2 switching time waveform
5 standard ics bu4528B / bu4528Bf power dissipation: pd (mw) 1200 1000 800 600 400 200 0 0255075100125150 ambient temperature: ta ( c) sop16 dip16 fig. 4 power dissipation vs. ta electrical characteristic curve sop16 bu4528B bu4528Bf dip16 0.4 0.1 1.27 0.15 0.15 0.1 0.3min. 4.4 0.2 6.2 0.3 0.11 1.5 0.1 1 16 10.0 0.2 8 9 0.51min. 0.3 0.1 9 16 8 1 6.5 0.3 3.2 0.2 4.25 0.3 0.5 0.1 19.4 0.3 2.54 0 ~ 15 7.62 external dimensions (units: mm) a in b in reset q : trigger : reset : retrigger q t n t n t n t 1 t 2 t 3 t n : (cx > 0.01 m f) t n 6 [0.2 + 0.1 ] ?rxcx t 1 , t 2 , t 3 : t 1 ,t 2 ,t 3 < t n 5 (v dd ?v ss ) fig. 3 timing chart
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