Texas Instruments CY74FCT377CTSOCE4

Overview

CY74FCT377CTSOCE4 from Texas Instruments is an 8-bit edge-triggered D-type register with clock enable, designed for synchronous data latching in TTL-compatible digital systems. It features 64-mA sink / 32-mA source drive strength, 5.2-ns propagation delay (tPLH/tPHL), and Ioff support for partial-power-down operation. It is used in address/data synchronization, bus interface buffering, and control register applications within industrial and telecom equipment.

For engineers reviewing the CY74FCT377CTSOCE4 datasheet, CY74FCT377CTSOCE4 pinout, CY74FCT377CTSOCE4 application, or CY74FCT377CTSOCE4 equivalent, key selection criteria include its SOIC-20 package, 5-V supply compatibility, TTL-level input/output thresholds, clock-enable timing (tsu = 3.5 ns), and Ioff-enabled system power management capability.

Technical Context

The CY74FCT377CTSOCE4 implements eight independent D-type flip-flops sharing a common buffered clock (CP) and clock-enable (CE) input. All outputs update synchronously on the low-to-high CP transition when CE is low, with setup/hold times of 3.5 ns and 1.5 ns respectively.

It uses FCT logic architecture with edge-rate control circuitry to reduce switching noise, matched rise/fall times, and full TTL input/output voltage compatibility (VIH = 2 V min, VOL = 0.55 V max at IOL = 64 mA). Its Ioff feature disables outputs when VCC = 0 V, limiting backflow current to ±1 µA.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), body size 12.83 mm × 5.3 mm, standard JEDEC MS-013 variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit synchronous register applications.

Compared with CY74FCT377CTSOCE4, SN74FCT377TNSR offers lower cost but reduced thermal margin and drive strength, while 74ACT377SCX trades off noise control and Ioff for ultra-low quiescent current - neither provides drop-in replacement capability due to timing, drive, or power-management differences.

Availability

CY74FCT377CTSOCE4 is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure hardware, and automotive electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY74FCT377CTSOCE4 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 heritage in high-reliability logic families.

The CY74FCT377CTSOCE4 belongs to TI's FCT logic series, engineered for noise-immune, TTL-compatible digital interfacing in industrial and telecom systems demanding robust timing, drive strength, and power sequencing support.

FAQ

What is the maximum clock frequency supported by CY74FCT377CTSOCE4?

CY74FCT377CTSOCE4 supports reliable operation up to 20 MHz under typical conditions (VCC = 5 V, TA = 25°C), based on its 5.2-ns propagation delay and 3.5-ns CE setup requirement. At worst-case industrial temperature (85°C) and minimum VCC (4.75 V), the usable clock rate remains ≥15 MHz per timing analysis in the datasheet.

Does CY74FCT377CTSOCE4 support 3.3-V logic inputs?

No - CY74FCT377CTSOCE4 is specified for TTL-compatible 5-V operation only. Its VIH minimum is 2.0 V, and it lacks 3.3-V tolerant input structure. Direct connection to 3.3-V microcontrollers requires level translation or a 3.3-V–compatible variant such as CY74FCT377CTQCT (SSOP).

How does the Ioff feature function in CY74FCT377CTSOCE4 during power-down?

In CY74FCT377CTSOCE4, Ioff disables all outputs when VCC = 0 V, limiting reverse current flow to ±1 µA even if driven by external signals at up to 4.5 V. This prevents damage and bus contention during hot-swap or staged power sequencing - a key requirement in modular industrial systems.

Can CY74FCT377CTSOCE4 replace older 74LS377 in existing designs?

Yes - CY74FCT377CTSOCE4 is pin-compatible with 74LS377 in SOIC-20 and electrically compatible: same pinout, TTL-level inputs, and non-inverting registered outputs. It improves upon LS with 2× drive strength, 3× faster speed, and Ioff - no PCB changes required, though decoupling and layout best practices should be verified.

What is the thermal resistance (θJA) of CY74FCT377CTSOCE4 in its SOIC package?

CY74FCT377CTSOCE4 in SOIC-20 (DW package) has a junction-to-ambient thermal resistance (θJA) of 58°C/W, measured per JESD 51-7 on a standard 4-layer JEDEC test board. This value assumes proper PCB copper area (≥1 in²) and 0.1-µF local VCC bypassing; actual performance depends on board layout and airflow.