Standard ICs BCD-to-decimal decoder BU4028B The BU4028B is a decoder which converts BCD signals to decimal signals. Of the ten outputs Q0 to Q9, those corresponding to the A to D input codes are set to “H”, and the others are all set to “L”. 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. •1)Features 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. •Logic circuit diagram •Block diagram Q0 Q4 Q2 1 16 VDD Q1 A 15 Q3 2 Q4 Q2 Q0 Q7 4 Q9 5 Q3 Q3 B 14 Q1 3 Q0 Q1 Q7 B Q9 C Q5 D Q6 A Q2 Q4 Q5 13 B C 12 C Q7 IN 11 D Q5 6 Q6 7 10 A VSS 8 9 Q6 D Q8 Q9 Q8 Q8 1 Standard ICs BA4028B •Truth table INPUT OUTPUT D C B A Q9 Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 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 •Absolute maximum ratings (Ta = 25°C, V SS Parameter Power supply voltage Symbol Limits Unit VDD – 0.3 ~ + 18 V Pd 1000 (DIP) mW Operating temperature Topr – 40 ~ + 85 °C Storage temperature Tstg – 55 ~ + 150 °C – 0.3 ~ VDD + 0.3 V Power dissipation Input voltage 2 = 0V) VIN Standard ICs BA4028B characteristics •DCElectrical characteristics (unless otherwise noted, Ta = 25°C, V Parameter Input high level voltage Min. Typ. Max. 3.5 — — VIH 7.0 — — 11.0 — — — — 1.5 — — 3.0 — — 4.0 — — VIL Input high level current IIH Input low level current IIL Output low level voltage Output high level current Output low level current Static current dissipation = 0V) Symbol Input low level voltage Output high level voltage SS VOH VOL IOH IOL IDD Unit VDD (V) Conditions Measurement circuit — Fig.1 — Fig.1 5 V 10 15 5 V 10 0.3 µA 15 VIH = 15V Fig.1 µA 15 VIL = 0V Fig.1 IO = 0mA Fig.1 IO = 0mA Fig.1 — — – 0.3 4.95 — — 9.95 — — 14.95 — — — — 0.05 — — 0.05 — — 0.05 – 0.16 — — – 0.4 — — – 1.2 — 0.44 — 1.1 — — 3.0 — — — — 1 — — 2 — — 4 15 5 V 10 15 5 V 10 15 5 VOH = 4.6V 10 VOH = 9.5V — 15 VOH = 13.5V — 5 VOL = 0.4V 10 VOL = 0.5V 15 VOL = 1.5V mA mA Fig.1 FIg.1 5 µA 10 VI = VDD or GND — 15 3 Standard ICs BA4028B Switching characteristics (Ta = 25°C, CL = 50pF, VSS = 0V) Parameter Output rise time Output fall time “L” to “H” propagation delay time “H” to “L” propagation delay time Input capacitance 4 Symbol tTLH tTHL tPLH tPHL CIN Min. Typ. Max. Unit — 180 — — 90 — — 65 — 15 — 100 — 5 — 50 — — 40 — — 300 — — 130 — — 90 — 15 — 300 — 5 — 130 — — 90 — — 5 — VDD (V) Conditions Measurement circuit — Fig.2, 3 — Fig.2, 3 — Fig.2, 3 — Fig.2, 3 — — 5 ns ns 10 10 15 5 ns ns 10 10 15 pF — Standard ICs BA4028B •Measurement circuits VDD 16 VDD 10 13 A B TABLE 12 VIN 11 C D VSS Q0 3 Q1 14 Q2 2 Q3 15 Q4 1 Q5 6 Q6 7 Q7 4 Q8 9 Q9 5 INPUT OUTPUT TEST NO. A B C D Pos. Neg. 1 VIN VSS VSS VSS Q1 Q0 VSS 2 VSS VIN VDD VSS Q6 Q4 3 VDD VDD VIN VSS Q7 Q3 4 VDD VSS VSS VIN Q9 Q1 5 VSS VIN VSS VSS Q2 Q0 6 VDD VSS VIN VSS Q5 Q1 7 VSS VSS VSS VIN Q8 Q0 8 VSS VSS VIN VSS Q4 Q0 9 VIN VDD VSS VSS Q3 Q2 Fig. 1 DC characteristics measurement circuit VIN VDD OUTPUT Pos. 16 VDD 10 13 A B TABLE 12 P.G. 11 C D VSS Q0 3 Q1 14 Q2 2 Q3 15 Q4 1 Q5 6 Q6 7 Q7 4 Q8 9 Q9 5 8 OUTPUT Neg. Note: Connect CL = 50pF to each output pin. VSS Fig. 2 Switching characteristics measurement circuit 20ns VDD 20ns 90% Input 50% 10% GND tPHL tPLH Neg. 90% Output 50% INPUT OUTPUT TEST NO. A B C D Pos. Neg. 1 P.G. VSS VSS VSS Q1 Q0 2 VSS P.G. VDD VSS Q6 Q4 3 VDD VDD P.G. VSS Q7 Q3 4 VDD VSS VSS P.G. Q9 Q1 5 VSS P.G. VSS VSS Q2 Q0 6 VDD VSS P.G. VSS Q5 Q1 7 VSS VSS VSS P.G. Q8 Q0 8 VSS VSS P.G. VSS Q4 Q0 9 P.G. VDD VSS VSS Q3 Q2 10% Pos. tTLH tTHL Fig. 3 Switching time test waveform 5 Standard ICs BA4028B •Electrical characteristics curve POWER DISSIPATION: Pd (mW) 1200 1000 800 600 400 200 0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE: Ta (°C) Fig.4 Power dissipation vs. Ta •External dimensions (Units: mm) 19.4 ± 0.3 9 1 8 0.51Min. 3.2 ± 0.2 4.25 ± 0.3 6.5 ± 0.3 16 7.62 0.3 ± 0.1 2.54 0.5 ± 0.1 DIP16 6 0° ~ 15°