Texas Instruments CY74FCT377CTSOCTG4

Overview

CY74FCT377CTSOCTG4 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.

For engineers reviewing the CY74FCT377CTSOCTG4 datasheet, CY74FCT377CTSOCTG4 pinout, CY74FCT377CTSOCTG4 application, or CY74FCT377CTSOCTG4 equivalent, key selection criteria include guaranteed 5-V TTL-level compatibility, matched rise/fall times, ESD protection exceeding JESD22-A114A (2000 V HBM), and SOIC-20 package thermal performance (θJA = 58°C/W).

Technical Context

The CY74FCT377CTSOCTG4 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; CE must be stable one setup time prior to that edge. The device uses FCT logic architecture with edge-rate control circuitry to reduce switching noise.

It supports full 5-V TTL input/output voltage levels (VIH = 2 V min, VIL = 0.8 V max), operates over –40°C to +85°C, and incorporates Ioff circuitry to disable outputs during power-down, preventing backflow current. Its dynamic supply current (ICCD) is 0.06–0.12 mA/MHz per switching bit under defined load conditions.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), body size 12.83 mm × 5.3 mm, standard 0.300″ wide, RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT377CTSOCT, CY74FCT377CTSOCTG4 offers identical electrical behavior and form factor but carries CY-series military-grade screening documentation; versus 74ACT377SCX, it delivers 2× faster propagation, 2.7× stronger sink drive, and critical Ioff safety for modular industrial hardware.

Availability

CY74FCT377CTSOCTG4 is available at Aetrix Electronics and suitable for bus interface buffering, address latching, and industrial control register applications requiring stable component supply, long-term lifecycle support, and guaranteed SOIC-20 packaging consistency.

Supply support for CY74FCT377CTSOCTG4 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 experience in high-reliability industrial and automotive ICs.

The CY74FCT377CTSOCTG4 belongs to TI's CY/FCT logic family, engineered for noise-immune, high-drive 5-V TTL interoperability in mission-critical industrial control, test equipment, and communications infrastructure.

FAQ

What is the maximum clock frequency supported by the CY74FCT377CTSOCTG4?

The CY74FCT377CTSOCTG4 does not specify a maximum clock frequency in its datasheet; instead, it defines minimum pulse width (tw = 6 ns) and setup/hold timing (tsu = 2 ns, th = 1.5 ns). Based on these, the practical maximum toggle rate is ~83 MHz for continuous operation with proper timing margins. The CY74FCT377CTSOCTG4 is optimized for synchronous bus applications up to 20–30 MHz where deterministic propagation delay (5.2 ns) matters more than raw frequency.

Does the CY74FCT377CTSOCTG4 support 3.3-V logic inputs?

No, the CY74FCT377CTSOCTG4 is strictly a 5-V TTL-compatible device. Its input thresholds are VIH = 2.0 V min and VIL = 0.8 V max - while 3.3-V logic high may meet VIH, it violates the recommended operating condition of VIN ≤ VCC – 0.2 V (i.e., ≤4.8 V) and risks marginal noise immunity. Direct connection to 3.3-V logic requires level translation; the CY74FCT377CTSOCTG4 itself does not support mixed-voltage operation.

What is the purpose of the Ioff feature in the CY74FCT377CTSOCTG4?

The Ioff feature in the CY74FCT377CTSOCTG4 disables all outputs when VCC = 0 V, placing them in high-impedance state regardless of input voltages. This prevents damaging current backflow from live system traces into the unpowered device - a critical requirement for hot-swap I/O modules and partial-power-down architectures. Ioff is fully characterized per JESD78 and verified down to –65°C, making it reliable in industrial PLC backplanes where CY74FCT377CTSOCTG4 is commonly deployed.

Can the CY74FCT377CTSOCTG4 be used as a drop-in replacement for SN74FCT377CTSOCT?

Yes, the CY74FCT377CTSOCTG4 is functionally, electrically, and mechanically identical to SN74FCT377CTSOCT - same pinout, same AC/DC specifications, same SOIC-20 package (DW), and same RoHS/MSL rating. The CY prefix denotes Cypress Semiconductor heritage (acquired by Infineon, then TI), but TI now manufactures and qualifies both under identical process and test flows. No PCB or firmware changes are required when substituting CY74FCT377CTSOCTG4 for SN74FCT377CTSOCT.

What thermal considerations apply to the CY74FCT377CTSOCTG4 in continuous operation?

The CY74FCT377CTSOCTG4 has a specified θJA of 58°C/W in SOIC-20 (DW) package. At maximum static ICC (0.2 mA) plus dynamic load (e.g., 8 outputs switching at 10 MHz), total power dissipation remains below 100 mW - resulting in <6°C junction-to-ambient rise. No heatsink is needed, but layout best practices (e.g., 2+ thermal vias under GND pad, 10-mm² copper pour) are recommended for sustained 64-mA sink operation to maintain TJ < 125°C in +85°C ambient.