74139
74139
74139
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74139 Dual Decoder-Demux IC

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The 74HC39 counter circuits contain independent ripple carry counters and utilize advanced silicon-gate CMOS technology.  The  MM74HC393  contains  two  4-bit  ripple carry binary counters, which can be cascaded to create a single divide-by-256 counter. Each of the two 4-bit counters is incremented on the HIGH- to-LOW transition (negative edge) of the clock input, and each  has  an  independent  clear  input.  When  clear  is  set HIGH all four bits of each counter are set to a low level. This enables count truncation and allows the implementation of divide-by-N counter configurations.

Features:

  • Typical operating frequency: 50 MHz
  • Typical propagation delay: 13 ns (Ck to QA)
  • Wide operating supply voltage range: 2–6V
  • Low input current: <1 µA
  • Low quiescent supply current: 80 µA maximum(74HC Series)
  • Fanout of 10 LS-TTL loads