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DM7447AN Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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DM7447AN Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 6 page ![]() www.fairchildsemi.com 2 Function Table H = HIGH level, L = LOW level, X = Don’t Care Note 1: BI/RBO is a wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO). Note 2: The blanking input (BI) must be OPEN or held at a HIGH logic level when output functions 0 through 15 are desired. The ripple-blanking input (RBI) must be OPEN or HIGH if blanking of a decimal zero is not desired. Note 3: When a LOW logic level is applied directly to the blanking input (BI), all segment outputs are HIGH regardless of the level of any other input. Note 4: When ripple-blanking input (RBI) and inputs A, B, C, and D are at a LOW level with the lamp test input HIGH, all segment outputs go H and the rip- ple-blanking output (RBO) goes to a LOW level (response condition). Note 5: When the blanking input/ripple-blanking output (BI/RBO) is OPEN or held HIGH and a LOW is applied to the lamp-test input, all segment outputs are L. Logic Diagram Decimal or Inputs BI/RBO Outputs Note Function LT RBI D C B A (Note 1) a b c d e f g 0 H H LLL L H LLL LLL H 1 H X LLL H H H L L H H H H 2 H X L LH L H L L H L LH L 3 H X L LH H H L L L LH H L 4 H X L HL L H H L L H HL L 5 H X L HL H H L H L L HL L 6 H X L H H L H H H L LLL L 7 H X L HHH H L L L H HHH (Note 2) 8 H X H LL L H LLL LLL L 9 H X H LL H H LLL H H L L 10 H X HL HL H H H H L L HL 11 H X HL H H H H H L L H HL 12 H X HH L L H H L H HH L L 13 H X H H LH H L H H LH L L 14 H X H H H L H H H H LLL L 15 H X H HHH H H HHH HHH BI X X X X X X L H HHH HHH (Note 3) RBI H L L L L L L H HHH HHH (Note 4) LT L X X X X X H LLL LLL L (Note 5) |
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