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| 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. *Features dissipation. 1) Low power 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 Q4 1 16 VDD 15 Q3 Q4 Q2 Q0 3 Q0 Q7 4 Q7 Q9 Q5 Q5 Q6 6 Q6 Q8 7 10 A 9 Q8 Q1 B C D A 11 D 13 B Q3 14 Q1 Q2 2 *Logic circuit diagram Q0 Q1 A B Q4 Q5 C Q6 Q7 IN D Q8 Q9 Q2 Q3 Q9 5 12 C VSS 8 1 Standard ICs BA4028B *Truth table INPUT D L L L L L L L L H H H H H H H H C L L L L H H H H L L L L H H H H B L L H H L L H H L L H H L L H H A L H L H L H L H L H L H L H L H Q9 L L L L L L L L L H L L L L L L Q8 L L L L L L L L H L L L L L L L Q7 L L L L L L L H L L L L L L L L Q6 L L L L L L H L L L L L L L L L OUTPUT Q5 L L L L L H L L L L L L L L L L Q4 L L L L H L L L L L L L L L L L Q3 L L L H L L L L L L L L L L L L Q2 L L H L L L L L L L L L L L L L Q1 L H L L L L L L L L L L L L L L Q0 H L L L L L L L L L L L L L L L *Absolute maximum ratings (Ta = 25C, VSS = 0V) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Input voltage Symbol VDD Pd Topr Tstg VIN Limits - 0.3 ~ + 18 1000 (DIP) - 40 ~ + 85 - 55 ~ + 150 - 0.3 ~ VDD + 0.3 Unit V mW C C V 2 Standard ICs BA4028B *Electrical characteristics otherwise noted, Ta = 25C, VSS = 0V) DC characteristics (unless Parameter Symbol Min. 3.5 Input high level voltage VIH 7.0 11.0 -- Input low level voltage VIL -- -- Input high level current Input low level current IIH IIL -- -- 4.95 Output high level voltage VOH 9.95 14.95 -- Output low level voltage VOL -- -- - 0.16 Output high level current IOH - 0.4 - 1.2 0.44 Output low level current IOL 1.1 3.0 -- Static current dissipation IDD -- -- Typ. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Max. -- -- -- 1.5 3.0 4.0 0.3 - 0.3 -- -- -- 0.05 0.05 0.05 -- -- -- -- -- -- 1 2 4 A mA mA V V A A V V Unit VDD (V) 5 10 15 5 10 15 15 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 VI = VDD or GND -- VOH = 4.6V VOH = 9.5V VOH = 13.5V VOL = 0.4V VOL = 0.5V VOL = 1.5V FIg.1 Fig.1 IO = 0mA Fig.1 IO = 0mA Fig.1 VIH = 15V VIL = 0V Fig.1 Fig.1 -- Fig.1 -- Fig.1 Conditions Measurement circuit 3 Standard ICs Switching characteristics (Ta = 25C, CL = 50pF, VSS = 0V) Parameter Symbol Min. -- Output rise time tTLH -- -- -- Output fall time tTHL -- -- -- "L" to "H" propagation delay time tPLH -- -- -- "H" to "L" propagation delay time tPHL -- -- Input capacitance CIN -- Typ. 180 90 65 100 50 40 300 130 90 300 130 90 5 Max. -- -- -- -- -- -- -- -- -- -- -- -- -- pF ns ns ns ns Unit Conditions BA4028B VDD (V) 5 10 15 5 10 15 5 10 15 5 10 15 -- Measurement circuit -- Fig.2, 3 -- Fig.2, 3 -- Fig.2, 3 -- Fig.2, 3 -- -- 4 Standard ICs BA4028B *Measurement circuits VDD 16 VDD 10 13 TABLE 12 VIN 11 C D A B Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 VSS Q9 3 14 2 15 1 6 7 4 9 5 TEST NO. 1 2 3 4 5 6 7 INPUT A VIN VSS VDD VDD VSS VDD VSS VSS VIN B VSS VIN VDD VSS VIN VSS VSS VSS VDD C VSS VDD VIN VSS VSS VIN VSS VIN VSS D VSS VSS VSS VIN VSS VSS VIN VSS VSS OUTPUT Pos. Q1 Q6 Q7 Q9 Q2 Q5 Q8 Q4 Q3 Neg. Q0 Q4 Q3 Q1 Q0 Q1 Q0 Q0 Q2 VSS 8 9 Fig. 1 DC characteristics measurement circuit VIN VDD 16 VDD 10 13 TABLE 12 P.G. 11 C D A B Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 VSS 8 VSS Q9 3 14 2 15 1 6 7 4 9 5 OUTPUT Pos. OUTPUT Neg. Note: Connect CL = 50pF to each output pin. Fig. 2 Switching characteristics measurement circuit 20ns 20ns VDD Input 90% 50% 10% tPHL Neg. Output 90% 50% 10% Pos. tTLH tTHL tPLH TEST NO. 1 2 3 4 5 6 7 8 9 INPUT A P.G. VSS VDD VDD VSS VDD VSS VSS P.G. B VSS P.G. VDD VSS P.G. VSS VSS VSS VDD C VSS VDD P.G. VSS VSS P.G. VSS P.G. VSS D VSS VSS VSS P.G. VSS VSS P.G. VSS VSS OUTPUT Pos. Q1 Q6 Q7 Q9 Q2 Q5 Q8 Q4 Q3 Neg. Q0 Q4 Q3 Q1 Q0 Q1 Q0 Q0 Q2 GND Fig. 3 Switching time test waveform 5 Standard ICs BA4028B *Electrical characteristics curve 1200 POWER DISSIPATION: Pd (mW) 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 16 9 6.5 0.3 1 0.51Min. 3.2 0.2 4.25 0.3 8 7.62 0.3 0.1 2.54 0.5 0.1 0 ~ 15 DIP16 6 |
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