1 standard ics bcd-to-decimal decoder bu4028b the bu4028b is a decoder which converts bcd signals to decimal signals. of the ten outputs q 0 to q 9 , those corresponding to the a to d input codes are set to ?? and the others are all set to ?? if inputs a to c are used and input d is used as disabled input, the bu4028b can also be used as a 1-of-8 decoder. 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 1ls-ttl input. block diagram q 2 q 4 q 8 q 7 q 9 q 5 q 6 q 0 b c d a q 1 q 3 2 q 2 q 4 q 7 q 9 q 5 q 6 q 0 3 4 5 6 7 8 15 14 13 12 11 10 9 v ss 1 v dd b c in d a q 1 q 3 q 8 16 logic circuit diagram a b c d q 0 q 1 q 2 q 3 q 4 q 5 q 6 q 7 q 8 q 9
2 standard ics BA4028B absolute maximum ratings (ta = 25?, v ss = 0v) parameter symbol limits unit power supply voltage v dd v power dissipation mw operating temperature ? 40 ~ + 85 c storage temperature ? 55 ~ + 150 c input voltage v in ? 0.3 ~ v dd + 0.3 v ? 0.3 ~ + 18 1000 (dip) pd topr tstg truth table input output dcbaq 9 q 8 q 7 q 6 q 5 q 4 q 3 q 2 q 1 q 0 l l l l l l l l l l h h l h l h l l l l l l l l l l l l l l l l l l l l l l l l l l l h l l h l l h l l h l l l l l l l h h h h l l h h l h l h l l l l l l l l l l l h l l h l l h l l h l l l l l l l l l l l l l l l l l l l h h h h l l l l l l h h l h l h l h l l h l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l h h h h h h h h l l h h l h l h l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l
3 standard ics BA4028B parameter symbol min. typ. max. unit conditions v dd (v) input high level voltage v ih 3.5 v 5 fig.1 7.0 10 11.0 15 input low level voltage v il 1.5 v 5 fig.1 3.0 10 4.0 15 input high level current i ih 0.3 m a15v ih = 15v fig.1 input low level current i il ? 0.3 m a15v il = 0v fig.1 output high level voltage v oh 4.95 v 5 fig.1 9.95 10 14.95 15 output low level voltage v ol 0.05 v 5 i o = 0ma fig.1 0.05 10 0.05 15 output high level current i oh ? 0.16 ma 5v oh = 4.6v fig.1 ? 0.4 10 v oh = 9.5v ? 1.2 15 v oh = 13.5v output low level current i ol 0.44 ma 5v ol = 0.4v fig.1 1.1 10 v ol = 0.5v 3.0 15 v ol = 1.5v static current dissipation i dd 1 m a 5 v i = v dd or gnd 210 415 i o = 0ma measurement circuit electrical characteristics dc characteristics (unless otherwise noted, ta = 25?, v ss = 0v)
4 standard ics BA4028B switching characteristics (ta = 25?, c l = 50pf, v ss = 0v) parameter symbol min. typ. max. unit conditions measurement circuit t tlh 180 ns 5 fig.2, 3 90 10 65 15 t thl 100 ns 5 fig.2, 3 50 10 40 15 ??to ??propagation delay time t plh 300 ns 5 fig.2, 3 130 10 90 15 ??to ??propagation delay time t phl 300 ns 5 fig.2, 3 130 10 90 15 input capacitance c in 5 pf v dd (v) output rise time output fall time
5 standard ics BA4028B measurement circuits v dd v dd v ss v ss v in table 3 q 0 a 10 16 b 13 c 12 d 11 14 q 1 2 q 2 15 q 3 1 q 4 6 q 5 7 q 6 4 q 7 9 q 8 5 q 9 fig. 1 dc characteristics measurement circuit test no. input output a b c d pos. neg. 1v in v ss v ss v ss q 1 q 0 q 6 q 4 q 7 q 3 q 9 q 1 q 2 q 0 q 5 q 1 q 8 q 0 q 4 q 0 q 3 q 2 2v ss v in v dd v ss 3v dd v dd v in v ss 4v dd v ss v ss v in 5v ss v in v ss v ss 6v dd v ss v in v ss 7v ss v ss v ss v in 8v ss v ss v in v ss 9v in v dd v ss v ss v in output pos. output neg. v dd table 3 a 10 16 b 13 c 12 d 11 14 2 15 1 6 7 4 9 5 p.g. note: connect c l = 50pf to each output pin. 8 v dd v ss v ss q 0 q 1 q 2 q 3 q 4 q 5 q 6 q 7 q 8 q 9 fig. 2 switching characteristics measurement circuit 90% 50% 10% 20ns 20ns 90% 50% 10% t phl v dd input gnd neg. pos. output t thl t plh t tlh fig. 3 switching time test waveform test no. input output a b c d pos. neg. 1 2 3 4 5 6 7 8 9 p.g. v ss v ss v ss q 1 q 0 q 6 q 4 q 7 q 3 q 9 q 1 q 2 q 0 q 5 q 1 q 8 q 0 q 4 q 0 q 3 q 2 v ss p.g. v dd v ss v dd v dd p.g. v ss v dd v ss v ss p.g. v ss p.g. v ss v ss v dd v ss p.g. v ss v ss v ss v ss p.g. v ss v ss p.g. v ss p.g. v dd v ss v ss
6 standard ics BA4028B electrical characteristics curve power dissipation: p d (mw) 1200 1000 800 600 400 200 0 0255075100125150 ambient temperature: ta ( c) fig.4 power dissipation vs. ta external dimensions (units: mm) dip16 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
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