The 74FCT191SO is a reversible modulo-16 binary counter, featuring synchronous counting andasynchronous presetting. The preset allows the 74FCT191SO 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.
Function, Pinout, and Drive Compatible with FCT and F Logic
Reduced VOH (Typically = 3.3 V) Versions of Equivalent FCT Functions
Edge-Rate Control Circuitry forSignificantly Improved Noise Characteristics
Ioff Supports Partial-Power-Down Mode Operation
Matched Rise and Fall Times
64-mA Output Sink Current
32-mA Output Source Current
SOIC 16 package. Manufactured by IDT.