Service Manuals, User Guides, Schematic Diagrams or docs for : . Electronic Components Datasheets Various datasheets 74ls47

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                                                                                                                   SN54/74LS47
BCD TO 7-SEGMENT
DECODER/DRIVER
   The SN54 / 74LS47 are Low Power Schottky BCD to 7-Segment Decod-
er / Drivers consisting of NAND gates, input buffers and seven AND-OR-IN-
VERT gates. They offer active LOW, high sink current outputs for driving                                               BCD TO 7-SEGMENT
indicators directly. Seven NAND gates and one driver are connected in pairs                                            DECODER/ DRIVER
to make BCD data and its complement available to the seven decoding
AND-OR-INVERT gates. The remaining NAND gate and three input buffers                                               LOW POWER SCHOTTKY
provide lamp test, blanking input / ripple-blanking output and ripple-blanking
input.
   The circuits accept 4-bit binary-coded-decimal (BCD) and, depending on
the state of the auxiliary inputs, decodes this data to drive a 7-segment display
indicator. The relative positive-logic output levels, as well as conditions
required at the auxiliary inputs, are shown in the truth tables. Output                                                                      J SUFFIX
configurations of the SN54 / 74LS47 are designed to withstand the relatively                                                                 CERAMIC
high voltages required for 7-segment indicators.                                                                                            CASE 620-09
   These outputs will withstand 15 V with a maximum reverse current of                                        16
                                                                                                                   1
250 

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