The MC14518B dual BCD counter and the MC14520B dual binary counter are constructed with MOS P−channel and N−channel enhancement mode devices in a single monolithic structure. Each consists of two identical, independent, internally synchronous 4−stage counters.
   
Features
• Diode Protection on All Inputs
• Supply Voltage Range = 3.0 Vdc to 18 Vdc
• Internally Synchronous for High Internal and External Speeds
• Logic Edge−Clocked Design − Incremented on Positive Transition of
    Clock or Negative Transition on Enable
• Capable of Driving Two Low−power TTL Loads or One Low−power
    Schottky TTL Load Over the Rated Temperature Range
• NLV Prefix for Automotive and Other Applications Requiring
    Unique Site and Control Change Requirements; AEC−Q100
    Qualified and PPAP Capable
• This Device is Pb−Free and is RoHS Compliant