Revised February 74AC • 74ACT Synchronous Presettable Binary Counter General Description Features The AC/ACT are high-speed. HE are high-speed synchronous modulo binary counters. A. A brief overview of IC . Synchronous Presettable Binary Counter. The AC/ACT are high- speed synchronous modulo binary counters. They are synchronously presettable.

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For faster clock rates, the carry lookahead connections shown in Figure 2 are recommended.

Counter and ROM

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. The TC output datashfet subject to decoding spikes due to internal race conditions and is therefore not recommended for use as a clock or asynchronous reset for flip-flops, registers or counters.


Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. The circuits have four fundamental modes of operation, in order of precedence: The clock inputs of all flip-flops are driven in parallel through a clock buffer.

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They are synchronously presettable for application in programmable dividers and have two types dataaheet Count Enable inputs plus a Terminal Count output for versatility in forming synchronous multistage counters. Absolute maximum ratings are those values beyond which damage to the device may occur. This total delay plus setup time sets the upper limit on clock frequency.

Since this final cycle takes 16 clocks to complete, there is plenty of time for the ripple to progress through the intermediate stages. In this scheme the ripple delay through the intermediate stages commences with the same clock that causes the first stage to tick over from max to min in the Up mode, or min to max in the Down mode, to start its final cycle. Fairchild does not recommend operation of circuits outside databook specifications.


Block Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. All outputs loaded; thresholds on input associated with output under test.