74LS247 74247 BCD To Seven Segment Decoder logic gates


This integrated circuit is a decoder for a 7-segment display that uses the outputs in direct connection to the BCD and the encoded quantity is placed in the inputs with a combination of the 4 input pins. It is an easy way to use the 7-segment display with its binary value.


Description of the 74LS247 decoder
The 74LS247 is a 7-segment BCD Decoder/Driver that is electrically and functionally identical to the SN5447A/SN7447A and has the same pin assignments as its counterparts. It can be used interchangeably in current or future designs to provide a choice between two display sources.


It features full input/output ripple suppression controls and a lamp test input. Segment identification and resulting displays are shown below. Display patterns for BCD input counts greater than 9 are unique symbols to authenticate input conditions.


The circuit incorporates automatic leading and/or trailing edge zero suppression control (RBI and RBO). Lamp testing (LT) of this type can be performed at any time when the BI/RBO node is at a high level. It contains a leading edge suppression input (BI) which can be used to control the lamp intensity by a pulse or to inhibit the outputs.


The inputs and outputs are fully compatible for use with TTL logic outputs.


Main features of the 74LS247 decoder
Outputs controlling results
Internally eliminates the need for external resistors
Automotive Qualification Standard
Applications: Driving Indicators, industrial