Counter Single 4-Bit Async Binary UP/Down 16-Pin SOIC T/R

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.

Function, Pinout, and Drive Compatible With FCT and F Logic

Reduced V_OH (Typically = 3.3 V) Versions of Equivalent FCT Functions

Edge-Rate Control Circuitry for Significantly Improved Noise Characteristics

I_off 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