datasheets 74ls47 free download

File name 74ls47.pdf

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