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SN74LS249N Datasheet(PDF) 3 Page - Motorola, Inc |
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SN74LS249N Datasheet(HTML) 3 Page - Motorola, Inc |
3 / 8 page 5-404 FAST AND LS TTL DATA SN54/74LS247 • SN54/74LS248 • SN54/74LS249 LS247 FUNCTION TABLE DECIMAL OR FUNCTION INPUTS BI/RBO OUTPUTS NOTE OR FUNCTION LT RBI D C B A BI/RBO a b c d e f g NOTE 0 H H L L L L H ON ON ON ON ON ON OFF 1 H X L L L H H OFF ON ON OFF OFF OFF OFF 2 H X L L H L H ON ON OFF ON ON OFF ON 3 H X L L H H H ON ON ON ON OFF OFF ON 4 H X L H L L H OFF ON ON OFF OFF ON ON 5 H X L H L H H ON OFF ON ON OFF ON ON 6 H X L H H L H ON OFF ON ON ON ON ON 7 H X L H H H H ON ON ON OFF OFF OFF OFF 1 8 H X H L L L H ON ON ON ON ON ON ON 9 H X H L L H H ON ON ON ON OFF ON ON 10 H X H L H L H OFF OFF OFF ON ON OFF ON 11 H X H L H H H OFF OFF ON ON OFF OFF ON 12 H X H H L L H OFF ON OFF OFF OFF ON ON 13 H X H H L H H ON OFF OFF ON OFF ON ON 14 H X H H H L H OFF OFF OFF ON ON ON ON 15 H X H H H H H OFF OFF OFF OFF OFF OFF OFF BI X X X X X X L OFF OFF OFF OFF OFF OFF OFF 2 RBI H L L L L L L OFF OFF OFF OFF OFF OFF OFF 3 LT L X X X X X H ON ON ON ON ON ON ON 4 LS248, LS249 FUNCTION TABLE DECIMAL OR FUNCTION INPUTS BI/RBO OUTPUTS NOTE OR FUNCTION LT RBI D C B A BI/RBO a b c d e f g NOTE 0 H H L L L L H H H H H H H L 1 1 H X L L L H H L H H L L L L 1 2 H X L L H L H H H L H H L H 3 H X L L H H H H H H H L L H 4 H X L H L L H L H H L L H H 5 H X L H L H H H L H H L H H 6 H X L H H L H H L H H H H H 7 H X L H H H H H H H L L L L 1 8 H X H L L L H H H H H H H H 9 H X H L L H H H H H H L H H 10 H X H L H L H L L L H H L H 11 H X H L H H H L L H H L L H 12 H X H H L L H L H L L L H H 13 H X H H L H H H L L H L H H 14 H X H H H L H L L L H H H H 15 H X H H H H H L L L L L L L BI X X X X X X L L L L L L L L 2 RBI H L L L L L L L L L L L L L 3 LT L X X X X X H H H H H H H H 4 H = HIGH Level, L = LOW Level, X = Irrelevant NOTES: 1. 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 NOTES: 1. be open or high if blanking of a decimal zero is not desired. 2. When a low logic level is applied directly to the blanking input (BI), all segment outputs are off regardless of the level of any other input. 3. 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 off and the NOTES: 1. ripple-blanking output (RBO) goes to a low level (response condition). 4. 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 on. BI/RBO is wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO). |
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