The SN74LS47 are Low Power Schottky
BCD to 7-Segment Decoder/Drivers consisting of NAND gates, input buffers and
seven AND-OR-INVERT gates. They offer active LOW, high sink current outputs for
driving indicators directly. Seven NAND gates and one driver are connected in
pairs to make BCD data and its complement available to the seven decoding
AND-OR-INVERT gates. The remaining NAND gate and three input buffers 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 configurations of the SN74LS47
are designed to withstand the relatively high voltages required for 7-segment
indicators
These outputs will withstand 15 V with
a maximum reverse current of 250 µA. Indicator segments requiring up to 24 mA
of current may be driven directly from the SN74LS47 high performance output
transistors. Display patterns for BCD input counts above nine are unique
symbols to authenticate input conditions
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