BCD To 7-Segment Decoder/Driver With Open-Collector Outputs

The LS47 accepts four lines of BCD (8421) input data, gen- erates their complements internally and decodes the data with seven AND OR Gates having open-collector outputs to drive indicator segments directly. Each segment output is guaranteed to sink 24 mA in the ON (LOW) state and with- stand 15V in the OFF (HIGH) state with a maximum leakage current of 250 A. Auxiliary inputs provided blanking, lamp test and cascadable zero-suppression functions. By Fairchild Semiconductor