Texas Instruments CY74FCT273CTSOCT

Overview

CY74FCT273CTSOCT from Texas Instruments is an 8-bit edge-triggered D-type flip-flop register with common clock (CP) and master reset (MR), delivering 5.8 ns propagation delay, 64 mA sink / 32 mA source output drive, and full TTL-compatible I/O levels. It operates across –40°C to 85°C and supports partial-power-down via Ioff, making it suitable for bus-interface and data-latching applications in industrial control backplanes.

For engineers reviewing the CY74FCT273CTSOCT datasheet, CY74FCT273CTSOCT pinout, CY74FCT273CTSOCT application, or CY74FCT273CTSOCT equivalent, key selection criteria include its SOIC-20 package, 5.8 ns max tPLH/tPHL, Ioff-enabled power-down isolation, matched rise/fall times, and compatibility with FCT/F logic families.

Technical Context

This device implements eight independent D-type flip-flops sharing a single buffered clock input (CP) and active-low master reset (MR), enabling synchronous loading and global clearing. Its edge-rate control circuitry suppresses switching noise, while the Ioff feature disables outputs during power-down to prevent current backflow.

It is fully specified for mixed-voltage systems: inputs accept TTL-level thresholds (VIH = 2 V min, VIL = 0.8 V max), outputs drive TTL loads (VOH ≥ 2.4 V at –32 mA, VOL ≤ 0.55 V at 64 mA), and supply voltage ranges from 4.75 V to 5.25 V with ±1 µA input leakage.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY74FCT273ATSOCT and SN74FCT273NSR, CY74FCT273CTSOCT provides the fastest timing (5.8 ns), full Ioff protection, and highest output drive (64 mA sink), making it optimal for noise-sensitive, hot-pluggable, or high-load industrial register applications.

Availability

CY74FCT273CTSOCT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface buffering, automated test equipment pattern generation, and motor control logic sequencing requiring stable component supply and long-term production continuity.

Supply support for CY74FCT273CTSOCT 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 for industrial, automotive, and communications markets.

CY74FCT273CTSOCT belongs to the FCT family of 5-V TTL-compatible logic devices, designed specifically for high-noise-immunity, high-drive, and partial-power-down operation in mission-critical industrial control systems.

FAQ

What is the maximum clock frequency supported by CY74FCT273CTSOCT?

CY74FCT273CTSOCT does not specify a maximum clock frequency in its datasheet; instead, it defines minimum pulse widths (t_w = 6 ns for CP and MR) and setup/hold times (t_su = 2 ns, t_h = 1.5 ns). Based on these, the practical maximum operating frequency is approximately 83 MHz under ideal conditions. However, system-level timing margins, trace routing, and load capacitance must be verified per design. CY74FCT273CTSOCT is optimized for robustness-not raw speed-in industrial timing-critical applications.

Does CY74FCT273CTSOCT support 3.3-V input logic levels?

No, CY74FCT273CTSOCT is not guaranteed to recognize 3.3-V inputs as valid logic highs. Its VIH(min) is 2.0 V under recommended operating conditions, but this threshold is defined for TTL-compatible signaling (VCC = 4.75–5.25 V). Applying 3.3-V logic signals risks marginal or incorrect recognition, especially over temperature and voltage extremes. For mixed-voltage systems, use a level translator or select a 3.3-V–tolerant register. CY74FCT273CTSOCT requires true 5-V TTL or CMOS-compatible inputs.

Can CY74FCT273CTSOCT be used in a hot-swap application?

Yes, CY74FCT273CTSOCT supports hot-swap operation via its Ioff feature: when VCC = 0 V, the outputs are disabled and leakage is limited to ±1 µA, preventing damaging back-current flow from live system buses into the unpowered device. This behavior is tested and specified per JESD78. To ensure safe hot-swap, MR must be held inactive (high) during insertion, and board-level current-limiting and sequencing should still be implemented. CY74FCT273CTSOCT is explicitly designed for such partial-power-down scenarios.

What is the thermal resistance (θJA) of CY74FCT273CTSOCT in SOIC package?

The junction-to-ambient thermal resistance (θJA) for CY74FCT273CTSOCT in SOIC-20 (DW) package is 58°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad, 2 oz Cu). Actual θJA in end equipment will vary based on PCB layout, copper area, airflow, and nearby heat sources. For thermal design, peak power dissipation of CY74FCT273CTSOCT is ~12.2 mA × 5.25 V ≈ 64 mW under worst-case dynamic load, yielding ~3.7°C junction-to-ambient rise above ambient under nominal conditions.

Is CY74FCT273CTSOCT pin-compatible with CY74FCT273T variants?

Yes, CY74FCT273CTSOCT is functionally and physically pin-compatible with all CY74FCT273T-series variants in SOIC-20 (DW) package, including CY74FCT273TSOCT and CY74FCT273ATSOC. All share identical pin assignments, electrical I/O characteristics (except speed grade and drive strength), and mechanical dimensions. The 'C' suffix denotes the 5.8 ns speed grade; 'A' and base 'T' denote 7.2 ns and 13 ns grades respectively. No PCB redesign is needed when upgrading within the same package.