Texas Instruments CY74FCT273ATSOCT

Overview

CY74FCT273ATSOCT from Texas Instruments is an 8-bit edge-triggered D-type flip-flop register with common clock (CP) and master-reset (MR) inputs, 7.2 ns maximum propagation delay, 64 mA sink / 32 mA source output drive, and Ioff partial-power-down support. It operates across –40°C to +85°C and is used in synchronous data latching for industrial control bus interfaces.

For engineers reviewing the CY74FCT273ATSOCT datasheet, CY74FCT273ATSOCT pinout, CY74FCT273ATSOCT application, or CY74FCT273ATSOCT equivalent, key selection criteria include TTL-compatible input thresholds, SOIC-20 package compatibility, guaranteed 2 ns minimum setup/hold timing, and Ioff-enabled system-level power sequencing.

Technical Context

This device implements eight independent D-type flip-flops sharing a single buffered clock and asynchronous master-reset line, enabling simultaneous loading or clearing of all eight bits on the rising edge of CP. Its logic is fully TTL-compatible with V_IL = 0.8 V and V_IH = 2.0 V at V_CC = 5 V.

The CY74FCT273ATSOCT integrates edge-rate control circuitry to suppress switching noise and features matched rise/fall times plus ESD protection exceeding JESD22-A114A (2000-V HBM), A115-A (200-V MM), and C101 (1000-V CDM).

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY74FCT273CTSOCT and SN74FCT273NSR, the CY74FCT273ATSOCT uniquely balances industrial temperature range, high-output drive, and controlled edge rates-making it optimal for real-time control systems requiring both robustness and timing predictability.

Availability

CY74FCT273ATSOCT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment digital pattern generation, and legacy bus interface adapters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY74FCT273ATSOCT 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.

The CY74FCT273ATSOCT belongs to TI's FCT logic family, engineered specifically for high-noise industrial and automotive environments where TTL compatibility, Ioff safety, and consistent timing behavior are mandatory design requirements.

FAQ

What is the maximum clock frequency supported by CY74FCT273ATSOCT?

The CY74FCT273ATSOCT does not specify a maximum clock frequency in its datasheet; instead, it guarantees timing parameters up to 13 ns propagation delay (for slower variants) and 7.2 ns for the 'A' speed grade. Based on t_PLH/t_PHL = 7.2 ns max and t_su/t_h = 2 ns/1.5 ns, the practical maximum toggle rate is ~60 MHz in ideal conditions. However, system-level timing must account for board trace delays and load capacitance. The CY74FCT273ATSOCT is typically deployed in 10–25 MHz synchronous bus applications where setup/hold margins are preserved.

Does CY74FCT273ATSOCT support hot-swap or partial-power-down operation?

Yes, the CY74FCT273ATSOCT includes Ioff circuitry that disables outputs when V_CC = 0 V, limiting Ioff current to ±1 µA. This feature prevents damaging current backflow from live system buses into the unpowered device, making the CY74FCT273ATSOCT suitable for hot-plug applications such as modular I/O carriers and field-replaceable controller units in industrial automation systems.

What is the pin 1 orientation for CY74FCT273ATSOCT in tape-and-reel packaging?

The CY74FCT273ATSOCT in SOIC-20 (DW) tape-and-reel packaging uses Quadrant Q1 for pin 1 orientation, per TI's tape-and-reel specification. This means pin 1 is located in the upper-left corner of the cavity when the tape is fed with sprocket holes on the left side and the component facing upward. The reel diameter is 330 mm, width is 24.4 mm, and pocket pitch is 12.0 mm - all standardized for automated pick-and-place placement.

How does CY74FCT273ATSOCT differ from CY74FCT273T variants?

The CY74FCT273ATSOCT is the 7.2 ns speed grade ('A') variant with 64 mA sink / 32 mA source drive, while CY74FCT273T (no suffix) is the 13 ns base-speed version with identical pinout and function but lower performance. The 'A' grade offers tighter timing margins and higher drive capability, making the CY74FCT273ATSOCT preferable for noise-sensitive or high-load applications where the base 'T' variant may fail to meet setup/hold or fanout requirements.

Is CY74FCT273ATSOCT RoHS compliant and what is its moisture sensitivity level?

Yes, the CY74FCT273ATSOCT is RoHS compliant (lead-free NiPdAu finish) and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH), per its SOIC-20 (DW) package specification. This eliminates bake requirements prior to reflow soldering and simplifies manufacturing logistics. The device ships in 2000-piece large tape-and-reel format with full traceability documentation available through Aetrix Electronics' quality portal.