Part # 74LS47 datasheet

Part Manufacturer: Motorola


Part Description: 74LS47

Part Details:

SN54/74LS47 BCD TO 7-SEGMENTDECODER/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 decodingAND-OR-INVERT gates. The remaining NAND gate and three input buffers LOW POWER SCHOTTKY provide lamp test, blanking input / ripple-blanking output and ripple-blankinginput. 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 displayindicator. The relative positive-logic output levels, as well as conditionsrequired 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 µA. Indicator segments requiring up to 24 mA of current may be drivendirectly from the SN74LS47 high performance output transistors. Displaypatterns for BCD input counts above nine are unique symbols to authenticateinput conditions. The SN54 / 74LS47 incorporates automatic leading and / or trailing-edge N SUFFIX zero-blanking control (RBI and RBO). Lamp test (LT) may be performed at any PLASTIC time which the BI / RBO node is a HIGH level. This device also contains an CASE 648-08 16 overriding blanking input (BI) which can be used to control the lamp intensity 1 by varying the frequency and duty cycle of the BI input signal or to inhibit theoutputs.· Lamp Intensity Modulation Capability (BI/RBO) D SUFFIX · Open Collector Outputs SOIC · 16 Lamp Test Provision CASE 751B-03 1 · Leading/Trailing Zero Suppression · Input Clamp Diodes Limit High-Speed Termination Effects ORDERING INFORMATION CONNECTION DIAGRAM DIP (TOP VIEW) SN54LSXXJ Ceramic VCC f g a b c d e SN74LSXXN Plastic

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74LS47.pdf Datasheet