Datasheets
contains datasheet of various chips
The DM74LS47 accepts four lines of BCD (8421) inputdata, generates their complements internally and decodesthe data with seven AND/OR gates having open-collectoroutputs to drive indicator segments directly. Each segmentoutput is guaranteed to sink 24 mA in the ON (LOW) stateand withstand 15V in the OFF (HIGH) state with a maxi-mum leakage current of 250µA. Auxiliary inputs providedblanking, lamp test and cascadable zero-suppression func-tions
The 555 timer IC was first introduced arround 1971 by the Signetics Corporation as theSE555/NE555 and was called “The IC Time Machine” and was also the very first and onlycommercial timer ic available. It provided circuit designers and hobby tinkerers with a relativelycheap, stable, and user-friendly integrated circuit for both monostable and astable applications.Since this device was first made commercially available, a myrad of novel and unique circuitshave been developed and presented in several trade, professional, and hobby publications. Thepast ten years some manufacturers stopped making these timers because of competition or other reasons. Yet other companies, like NTE (a subdivision of Philips) picked up where some left off.
The LS160A/161A/162A/163A are high-speed 4-bit synchronous counters. They are edge-triggered, synchronously presettable, and cascadable MSI building blocks for counting, memory addressing, frequency division and
other applications. The LS160A and LS162A count modulo 10 (BCD). The LS161A and LS163A count modulo 16 (binary.)
