可預置同步 4 位二進制加/減計數器
| Function | Binary Counter |
| Bits (#) | 4 |
| Technology Family | FCT |
| Supply voltage (Min) (V) | 4.75 |
| Supply voltage (Max) (V) | 5.25 |
| Input type | TTL-Compatible CMOS |
| Output type | Push-Pull |
| Features | Ultra high speed (tpd <5ns), Partial power down (Ioff), Presettable |
- 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
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.
