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 for

Significantly Improved Noise

Characteristics

Ioff Supports Partial-Power-Down Mode

Operation

ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

Matched Rise and Fall Times

64-mA Output Sink Current

32-mA Output Source Current

description

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.