FCT374T/FCT2374T, FCT534T and FCT574T/FCT2574T are 8-bit registers built using an advanced dual metal CMOS technology. These registers consist of eight D-type flip-flops with a buffered common clock and buffered 3-state output control. When the output enable (OE) input is LOW, the eight outputs are enabled. When the OE input is HIGH, the outputs are in the high-impedance state. Input data meeting the set-up and hold time requirements of the D inputs is transferred to the Q outputs on the LOW-to-HIGH transition of the clock input. The FCT2374T and FCT2574T have balanced output drive with current limiting resistors. This offers low ground bounce, minimal undershoot and controlled output fall times-reducing the need for external series terminating resistors. FCT2xxxT parts are plug-in replacements for FCTxxxT parts.
The IDT54/74FCT family offers fast CMOS octal D registers with low input and output leakage, true TTL compatibility, and a range of speed grades. Devices are available in multiple packages (DIP, SOIC, SSOP, QSOP, CERPACK, LCC) and in commercial, military, radiation‑tolerant, and radiation‑enhanced versions.
The datasheet details pin configurations, absolute maximum ratings, DC electrical characteristics, output drive specifications, power‑supply behavior, and switching performance. It also includes test circuits, timing diagrams, and ordering information for each device variant.
| Input HIGH voltage (VIH) | 2.0 V |
|---|---|
| Input LOW voltage (VIL) | 0.8 V |
| Commercial operating temperature range | 0°C to +70°C |
| Military operating temperature range | -55°C to +125°C |
| High drive output current (FCT374T/534T/574T) | -15 mA (low) / 48 mA (high) |
| Resistor‑output drive current (FCT2374T/2574T) | -15 mA (low) / 12 mA (high) |
The devices have low input and output leakage of less than 1 µA (max).
They are available in DIP, SOIC, SSOP, QSOP, CERPACK, and LCC packages.
The commercial temperature range is 0 °C to +70 °C.