Texas Instruments CY74FCT2374TSOCE4

Overview

CY74FCT2374TSOCE4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for high-speed bus-oriented applications. It features 25-Ω on-chip output series resistors, 12 mA sink / 15 mA source drive strength, I_off support for partial-power-down operation, and TTL-compatible input/output logic levels. It operates at 5 V supply and delivers 10 ns typical propagation delay (t_PLH/t_PHL) across –40°C to 85°C.

For engineers reviewing the CY74FCT2374TSOCE4 datasheet, CY74FCT2374TSOCE4 pinout, CY74FCT2374TSOCE4 application, or CY74FCT2374TSOCE4 equivalent, key selection criteria include 3-state bus interface capability, edge-rate control for noise reduction, I_off protection during power sequencing, matched rise/fall times, and SOIC-20 package compatibility with legacy FCT logic designs.

Technical Context

The CY74FCT2374TSOCE4 implements eight independent D-type latches triggered on the low-to-high transition of a common buffered clock (CP) input. Each flip-flop samples its dedicated D-input under setup/hold timing constraints (t_su = 2 ns, t_h = 1.5 ns), while a shared output-enable (OE) controls all eight 3-state outputs simultaneously.

Its integrated 25-Ω series termination resistors suppress transmission-line reflections without external components. The I_off circuitry actively disables outputs when V_CC = 0 V, preventing backflow current during partial power-down - a critical requirement in hot-swap and multi-rail systems.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), 7.6 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type register applications.

Compared with CY74FCT2374ATSOC and SN74FCT2374TSO, the CY74FCT2374TSOCE4 provides optimal balance of noise suppression (via edge-rate control), industrial temperature range, and I_off-enabled power sequencing - making it the preferred choice for bus interface applications where signal integrity and robust power management outweigh raw speed.

Availability

CY74FCT2374TSOCE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, test equipment digital pattern generators, and legacy computer memory interfaces requiring stable component supply across extended product lifecycles.

Supply support for CY74FCT2374TSOCE4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of leadership in industrial and automotive interface ICs.

The CY74FCT2374TSOCE4 belongs to TI's FCT logic family, engineered specifically for noise-sensitive, high-speed parallel bus applications where signal integrity, power sequencing safety, and TTL interoperability are mandatory design requirements.

FAQ

What is the maximum clock frequency supported by CY74FCT2374TSOCE4?

The CY74FCT2374TSOCE4 supports a typical switching rate of 250 MHz, with guaranteed timing performance up to 100 MHz based on its 10 ns maximum propagation delay (t_PLH/t_PHL) and 2 ns minimum setup time (t_su). For reliable operation, system clock edges must meet the specified setup/hold windows relative to the CP input, and load capacitance must remain ≤50 pF per output as defined in the TI datasheet SCCS040A.

Does CY74FCT2374TSOCE4 require external pull-up or pull-down resistors on unused inputs?

Yes - per TI's recommended operating conditions, all unused inputs of CY74FCT2374TSOCE4 must be held at either V_CC or GND to prevent floating states that could cause excessive ICC current, unpredictable output behavior, or increased EMI. This applies to unused D inputs, CP, and OE pins; tying them directly to supply or ground ensures deterministic logic levels and stable device operation.

Can CY74FCT2374TSOCE4 be used with 3.3 V logic systems?

No - CY74FCT2374TSOCE4 is a 5 V-only device with absolute maximum V_CC rating of 7 V and recommended operating range of 4.75–5.25 V. Its input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and output levels (VOH ≈ 3.3 V, VOL ≈ 0.55 V at 5 V) are optimized for TTL/5 V CMOS compatibility. Interfacing with 3.3 V systems requires level translation or a 3.3 V–compatible alternative such as SN74LVC8T245.

What does the "E4" suffix in CY74FCT2374TSOCE4 indicate?

Per Texas Instruments' packaging nomenclature, the "E4" suffix in CY74FCT2374TSOCE4 denotes tape-and-reel packaging in a standard SOIC-20 (DW) carrier with 2,500 units per reel, RoHS-compliant finish (NiPdAu), and MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH). It does not affect electrical specifications - CY74FCT2374TSOCE4 shares identical timing, drive, and thermal characteristics with tube-packaged CY74FCT2374TSOC.

How does the I_off feature protect CY74FCT2374TSOCE4 during partial power-down?

The I_off circuitry in CY74FCT2374TSOCE4 disables all outputs when V_CC = 0 V, limiting leakage current to ±1 µA even if input or output pins are driven to 4.5 V. This prevents damaging reverse current flow through the device during power sequencing events - such as when a peripheral remains powered while the host logic rail is off - thereby eliminating the need for external blocking diodes or isolation switches in multi-rail systems.