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DM74LS249N Folha de dados(PDF) 3 Page - National Semiconductor (TI) |
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DM74LS249N Folha de dados(HTML) 3 Page - National Semiconductor (TI) |
3 / 6 page Switching Characteristics VCC ea50V TA ea25 C RL e 2kX Symbol Parameter CL e 15 pF Units Min Max tPLH Propagation Delay Time 100 ns tPHL An to a–g (54LS RL e 2kX) 100 tPLH Propagation Delay Time 100 ns tPHL BI to a – g (54LS RL e 6kX) 100 Numerical DesignationsResultant Displays TLF10213 – 3 Truth Table Decimal Inputs Outputs or Note Function LT A3 A2 A1 A0 BIRBO abc d e f g 0 H LLLL H HHHHHH L 1 1 H L L L H H L H H LLLL 1 2 H L L H L H H HLH HLH 3 H L L H H H HHHH L L H 4 H L H L L H LH HL LH H 5 H LHLH H H L H H L H H 6 H L H H L H L L HHHHH 7 H L H H H H H H H LLLL 8 H H L L L H HHHHHHH 9 H H L L H H HHH L L HH 10 H HLHL H L L L H H L H 11 H H L H H H LL H H LL H 12 H H H L L H L H LLL H H 13 H H H L H H H L LHLH H 14 H H H H L H L L L HHHH 15 H HHHH H LLLLLLL BI X XXXX L LLLLLLL 2 LT L XXXX H HHHHHHH 3 Note 1 BIRBO is wired-AND logic serving as blanking input (BI) andor ripple-blanking output (RBO) The blanking out (BI) must be open or held at a HIGH level when output functions 0 through 15 are desired X e input may be HIGH or LOW Note 2 When a LOW level is applied to the blanking input (forced condition) all segment outputs go to a LOW level regardless of the state of any other input condition Note 3 When the blanking inputripple-blanking output (BIRBO) is open or held at a HIGH level and a LOW level is applied to lamp test input all segment outputs go to a HIGH level 3 |
Nº de peça semelhante - DM74LS249N |
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Descrição semelhante - DM74LS249N |
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