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DM74LS47 Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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DM74LS47 Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 8 page Switching Characteristics at V CC = +5.0V, TA = +25˚C R L = 665Ω Symbol Parameter Conditions C L = 15 pF Units Min Max t PLH Propagation Delay 100 ns t PHL An to a –g 100 t PLH Propagation Delay 100 ns t PHL RBI to a –g (Note 6) 100 Note 6: LT = HIGH, A0–A3 = LOW Functional Description The ’LS47 decodes the input data in the pattern indicated in the Truth Table and the segment identification illustration. If the input data is decimal zero, a LOW signal applied to the RBI blanks the display and causes a multidigit display. For example, by grounding the RBI of the highest order decoder and connecting its BI/RBO to RBI of the next lowest order decoder, etc., leading zeros will be suppressed. Similarly, by grounding RBI of the lowest order decoder and connecting its BI/RBO to RBI of the next highest order decoder, etc., trailing zeros will be suppressed. Leading and trailing zeros can be suppressed simultaneously by using external gates, i.e.: by driving RBI of a intermediate decoder from an OR gate whose inputs are BI/RBO of the next highest and lowest order decoders. BI/RBO also serves as an unconditional blanking input. The internal NAND gate that generates the RBO signal has a resistive pull-up, as opposed to a totem pole, and thus BI/RBO can be forced LOW by external means, using wired-collector logic. A LOW signal thus ap- plied to BI/RBO turns off all segment outputs. This blanking feature can be used to control display intensity by varying the duty cycle of the blanking signal. A LOW signal applied to LT turns on all segment outputs, provided that BI/RBO is not forced LOW. 3 www.fairchildsemi.com |
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