Texas Instruments CY54FCT374TDMB

Overview

CY54FCT374TDMB from Texas Instruments is a radiation-tolerant, high-speed octal D-type flip-flop with 3-state outputs, designed for military and aerospace bus-interface applications. It features edge-triggered D inputs, common buffered clock (CP) and output-enable (OE), 11 ns max propagation delay (tPLH/tPHL), 32 mA sink / 12 mA source drive capability, and operates across –55°C to +125°C.

For engineers reviewing the CY54FCT374TDMB datasheet, CY54FCT374TDMB pinout, CY54FCT374TDMB application, or CY54FCT374TDMB equivalent, this page delivers verified electrical specs, military-grade thermal and ESD performance data, CDIP-20 package layout, and validated drop-in alternatives for space-qualified digital logic design.

Technical Context

The CY54FCT374TDMB implements eight independent D-type latches synchronized to the low-to-high transition of CP, with all outputs placed in high-impedance state when OE is high. Its Ioff circuitry enables partial-power-down operation by disabling outputs and blocking reverse current flow during power-off conditions.

It uses FCT-family TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) and delivers rail-aligned VOH ≈ 3.3 V (typ) and VOL ≤ 0.55 V (max at 32 mA), with matched rise/fall times and edge-rate control circuitry to suppress switching noise in high-density systems.

Key Specifications

Pinout & Package

Package: CDIP-20 (Ceramic Dual In-line Package), hermetically sealed, lead finish SNPB, RoHS-exempt, 20-pin through-hole mounting with 0.300" wide body and standard DIP footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY54FCT374TDMB, 5962-9221802MRA offers identical performance in the same CDIP-20 form factor but under formal DSCC part numbering, while CY54FCT374TLMB provides equivalent logic functionality in a more rugged LCCC package suited for high-vibration environments - both require no redesign but differ in procurement path and mechanical integration.

Availability

CY54FCT374TDMB is available at Aetrix Electronics and suitable for avionics data acquisition, satellite onboard computer bus interface, missile guidance signal conditioning, and nuclear power plant control system I/O requiring stable component supply across extended temperature and radiation environments.

Supply support for CY54FCT374TDMB 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 with over 50 years of analog and logic IC development, serving defense, aerospace, industrial, and automotive markets with high-reliability components.

The CY54FCT374TDMB belongs to TI's military-grade FCT logic family, engineered specifically for radiation-tolerant, high-speed digital interfacing in mission-critical systems operating under extreme thermal and electrical stress.

FAQ

What is the maximum clock frequency supported by the CY54FCT374TDMB?

The CY54FCT374TDMB supports reliable operation up to 25 MHz based on its 11 ns maximum propagation delay and 7 ns minimum clock pulse width. At 25 MHz, setup (2 ns) and hold (1.5 ns) timing margins are fully satisfied under worst-case –55°C to +125°C conditions with VCC = 4.5 V.

Does the CY54FCT374TDMB require external pull-up resistors on its 3-state outputs?

No, the CY54FCT374TDMB does not require external pull-ups on its O0–O7 outputs. Its 3-state outputs are actively driven to high-Z (not floating), and the Ioff feature ensures no leakage path exists when VCC = 0 V. Pull-ups are only needed if bus termination or weak-state biasing is required by the system architecture.

Is the CY54FCT374TDMB pin-compatible with the commercial CY74FCT374T?

Yes, the CY54FCT374TDMB is pin-compatible with the commercial CY74FCT374T in CDIP-20 packaging. Both share identical pinout, logic function, and DC/AC electrical behavior. However, CY54FCT374TDMB adds MIL-PRF-38535 qualification, extended temperature range, and enhanced ESD/thermal specs - no PCB changes are required for drop-in replacement in ruggedized designs.

What is the purpose of the Ioff feature in the CY54FCT374TDMB?

The Ioff feature in the CY54FCT374TDMB disables all outputs when VCC = 0 V, limiting reverse current to ±1 µA max. This prevents damaging backflow from live bus lines into a powered-down subsystem - critical for hot-swap capability, staged power sequencing, and fault-isolation in redundant avionics architectures.

Can the CY54FCT374TDMB be used with 3.3 V logic systems?

The CY54FCT374TDMB is specified only for 4.5 V to 5.5 V VCC operation and is not 3.3 V tolerant. Its inputs require TTL-level thresholds (VIH ≥ 2 V), and outputs swing near VCC (VOH ≈ 3.3 V typ at VCC = 5 V). Direct connection to 3.3 V systems risks overvoltage damage; level translation or voltage translation buffers are required.