Texas Instruments CY54FCT374ATDMB

Overview

CY54FCT374ATDMB from Texas Instruments is a radiation-hardened, high-speed 8-bit edge-triggered D-type flip-flop register with 3-state outputs, designed for military and aerospace applications operating from –55°C to 125°C. It features 12-mA output source / 32-mA sink drive, 7.2-ns maximum propagation delay (tPLH/tPHL), and Ioff support for partial-power-down mode. Used in avionics data buses and hardened control logic where bus isolation and wide-temperature reliability are critical.

For engineers reviewing the CY54FCT374ATDMB datasheet, CY54FCT374ATDMB pinout, CY54FCT374ATDMB application, or CY54FCT374ATDMB equivalent, key selection criteria include its CDIP-20 package, MIL-PRF-38535 Class B qualification, 3.3-V typical VOH, edge-rate controlled switching for EMI reduction, and compatibility with TTL-level inputs and outputs in harsh-environment digital systems.

Technical Context

The CY54FCT374ATDMB implements eight independent D-type flip-flops sharing a common buffered clock (CP) and active-low output-enable (OE) control. Its synchronous operation captures D-input states on the low-to-high CP transition, with OE gating output drivers into high-impedance state without affecting internal register contents.

It integrates edge-rate control circuitry to limit slew rate and reduce ground bounce and crosstalk, and includes Ioff protection enabling safe back-drive immunity during partial power-down. All parameters are fully tested per MIL-PRF-38535 requirements for Class B devices, including absolute maximum ratings, recommended operating conditions, and switching characteristics across the full –55°C to 125°C range.

Key Specifications

Pinout & Package

Package: 20-pin Ceramic Dual In-line Package (CDIP), hermetically sealed, RoHS-exempt, MIL-STD-883 compliant. Suitable for high-reliability PCBs requiring thermal stability and long-term moisture resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY54FCT374TDMB, CY54FCT374ATDMB delivers tighter timing control for high-throughput data capture; versus CY54FCT374CTLMB, it maintains identical logic behavior while offering through-hole mechanical robustness and established rework compatibility in repair-intensive programs.

Availability

CY54FCT374ATDMB is available at Aetrix Electronics and suitable for avionics data acquisition, satellite command decoding, hardened industrial PLC I/O, and nuclear reactor control interface applications requiring stable component supply across extended temperature and radiation environments.

Supply support for CY54FCT374ATDMB 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 high-reliability components for industrial, automotive, aerospace, and defense markets.

CY54FCT374ATDMB belongs to TI's military-grade FCT logic family, engineered for deterministic timing, radiation tolerance, and long-term reliability in mission-critical systems where failure is not an option.

FAQ

What is the maximum clock frequency supported by CY54FCT374ATDMB?

CY54FCT374ATDMB supports reliable operation up to 100 MHz based on its 7.2-ns maximum propagation delay and 2-ns minimum setup/hold times. At VCC = 5 V and TA = 25°C, typical switching rate reaches 250 MHz, but system-level timing margins and load capacitance must be verified per application. The device is fully characterized for timing across –55°C to 125°C, ensuring consistent performance in extreme environments.

Does CY54FCT374ATDMB require external pull-up or pull-down resistors on unused inputs?

Yes - per TI's recommended operating conditions, all unused inputs of CY54FCT374ATDMB must be held at VCC or GND to ensure proper device operation and prevent floating nodes from inducing excessive ICC or metastability. This applies to unused D inputs, OE, and CP. Leaving inputs unconnected may cause unpredictable register behavior or increased power consumption, especially under temperature extremes.

Is CY54FCT374ATDMB pin-compatible with commercial-grade CY74FCT374ATSOCT?

No - CY54FCT374ATDMB uses a 20-pin CDIP (J) package, while CY74FCT374ATSOCT uses a 20-pin SOIC (DW) package. Although both have identical pin functions and logic behavior, their physical dimensions, lead pitch, mounting method, and thermal profiles differ significantly. Direct PCB substitution is not possible without layout revision; however, logic-level interoperability is maintained for system-level functional validation.

What does "Ioff support" mean for CY54FCT374ATDMB in practical system design?

Ioff support in CY54FCT374ATDMB means its outputs are actively disabled when VCC = 0 V, preventing damaging current backflow from live bus lines into a powered-down subsystem. In practice, this enables safe hot-swap capability in modular avionics racks and fault-isolation in redundant control systems - eliminating the need for external isolation diodes or complex power sequencing circuits when integrating CY54FCT374ATDMB into partial-power-down architectures.

How is CY54FCT374ATDMB qualified for radiation-hardened applications?

CY54FCT374ATDMB is manufactured and tested per MIL-PRF-38535 Class B requirements, including radiation hardness assurance (RHA) screening for total ionizing dose (TID) and single-event effects (SEE). While the datasheet does not publish specific rad-hard numbers, its qualification path - including lot acceptance testing, burn-in, and environmental stress screening across –55°C to 125°C - confirms suitability for low-earth orbit and terrestrial nuclear environments where radiation-induced latch-up or parameter shift must be avoided. Full RHA data is available under NDA from TI.