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CY74FCT191CT,pdf(4-Bit Up/Down

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The CY74FCT191T is a reversible modulo-16 binary counter, featuring synchronous counTIng and asynchronous presetTIng. The preset allows the CY74FCT191T to be used in programmable dividers. The count enable input, terminal count output, and ripple-clock output make possible a variety of methods of implemenTIng mulTIusage counters. In the counting modes, state changes are initiated by the rising edge of the clock. This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.
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